Researches – Giuseppe Galletta Astrophysicist

Since 1976, his research has focused on the motion of stars and gas within galaxies. In 1986, his scientific achievements earned him a promotion to Associate Professor (II fascia), holding the Chair of Astronomy for the Degree Programme in Natural Sciences. While his research has been primarily observational, he has also worked on theoretical models of galaxies and their simulation through computational techniques.

In 1978, he discovered a new type of galaxy with an elongated structure (triaxial galaxies with polar rings), also developing the first theoretical models to describe them.

In 1985, he discovered the phenomenon of counter-rotation in galaxies, where the gas rotates in the opposite direction to the stars.

He has conducted observations using major European optical telescopes at La Silla (Chile), the 3.9m Anglo-Australian Telescope in Australia, British and Spanish telescopes at La Palma (Canary Islands, Spain), as well as the SEST (Chile), VLA (USA), and IRAM (Spain-France) radiotelescopes, and the IUE and GALEX satellites.

Since 2000, he has been involved in Astrobiology. In 2006, he conceived and directed the LISA project (Italian Laboratory for Environment Simulation), conducting biological experiments in simulated Martian environments.

Main Scientific Results

1. The existence of ‘prolate’ galaxies (Ap.J. 226, L115, 1978)

Around the end of the 1970s, some astronomers, such as J. Binney, suggested that the structure of elliptical galaxies could be triaxial rather than oblate. Most of the effort during those years was devoted to statistical tests of this idea, while no direct proof of non-oblate galaxies yet existed. In 1978, "Bertola and Galletta’s discovery of a class of ellipticals with minor-axis dust lanes suggested that these galaxies would be good candidates for being prolate¹. They suggest a new class of galaxies: prolate stellar structures cut equatorially by gaseous planes²". This was one of the first papers attempting to use observations to distinguish between oblate and prolate potentials."The discovery of inclined and warped gas disks in ellipticals has opened up the possibility to learn about the shape of the potential, i.e., whether it is generally oblate, prolate or triaxial. As a result, many theoretical and observational papers have been devoted to this subject in the past years¹." In this paper, Bertola and Galletta indicated a few objects possibly related to minor-axis, dust-lane ellipticals, such as NGC 2685 (the Spindle Galaxy) and NGC 4650A. These galaxies were later discovered to belong to another class of peculiar objects: Polar Ring Galaxies³.

2. Triaxial models of Elliptical galaxies (MNRAS, 193, 885, 1980)

The statistical approach to demonstrate the triaxiality of Elliptical galaxies was a hot subject at the beginning of the ’80s. In this year, appears a paper where "Benacchio and Galletta have made an interesting first attempt to study the distribution of intrinsic shapes […] The best fit is obtained for models that are mildly triaxial. […] The machinery developed in this paper is useful, and should yield stricter limits on galaxies shapes when applied to more accurate measurements of a larger sample of galaxies⁴."

3. The relation between twisting and flattening in Ellipticals (A&A, 81, 179, 1980)

Another way to demonstrate the triaxiality of certain elliptical galaxies is to study the twisting of their isophotes, which is a typical consequence of triaxiality. Unlike intrinsic distortions such as the warping of the equatorial plane, triaxiality follows its own specific rules. In 1980, the first paper was published showing that the total twist angle $Deltaphi$ correlates with apparent ellipticity. Galaxies that are highly flattened ( 0.25" data-index-in-node="443">ε > 0.25) show only small twists ( $Deltaphi$ <span class="math-inline" data-math="Deltaphi < 20°). This relation for galaxies with a luminosity profile following the $r^{1/4}$ law has since been confirmed by various authors.

4. The existence of S0s with counter-rotation (ApJ 318, 531, 1987)

In 1986, during a systematic study of barred S0s conducted at ESO, Galletta found the first S0 galaxy (NGC 4546) in which the gas disk rotates in the opposite direction with respect to the stars (counter-rotation). Parallel to the discovery of counter-rotation in Ellipticals^5,6, "this was an extraordinarily clear example of a “second event” in the history of a galaxy⁷."

5. The existence of Spirals with counter-rotation (Nature, 375, 661, 1995)

Focusing on the effects of interactions between galaxies, Galletta sought to link various types of galaxies (dust-lane Ellipticals, polar-ring S0s, and Elliptical and S0 galaxies with counter-rotation) into a unified framework, proposing them as different outcomes of the same gas accretion phenomenon. Consequently, starting in 1983, he began observing a number of spiral galaxies featuring anomalous dust arcs. Ultimately, together with Ciri and Bettoni, he discovered the first spiral galaxy where the entire gaseous disk is in counter-rotation.

(in italic are the citations from review by other authors)

1. F. Schweizer, 1983, I.A.U. Symp. n.127, ed. T. de Zeeuw, p. 114.
2. Voigt, Huchtmeier, 1982, Landolt-Börnstein, Handbuch der Physik, Vol. 2c, p. 256, Springer-Verlag.
3. F. Schweizer, B.C. Whitmore, V.C. Rubin, 1983, AJ 88, 909.
4. J. Kormendy, 1982, Morphology and Dynamics of Galaxies, XII Adv. Course SAAS-FEE, ed. L. Martinet and M. Mayor, p. 150.
5. D. Bettoni, 1984, The Messenger 37, 17.
6. N. Caldwell, R.P. Kirshner, D.O. Richstone, 1986, ApJ 305, 136.
7. From a personal letter by Prof. M. Schwarzschild, Princeton, March 2, 1987.

Scientific Publications

List of scientific publications by Giuseppe Galletta. Each entry contains: authors, year of publication, title, scientific journal or publisher, volume, pages, bibliographic identifiers (ISBN or ISSN), and the publication archive number of the University of Padua. Publications are numbered in reverse chronological order. The list includes: articles in international journals, papers presented at international conferences, monographs in Italian, and databases within the Strasbourg Astronomical Data Center (CDS) archive.

124 – Galletta, G. (2026). The Many Faces of Astrobiology, Modern Culture’s Answers to an Ancient Question, Springer Nature, in press.

123 – Galletta, G. (2025). Schizzi di Cosmologia. p. 1-102, Padova: Padova University Press, ISBN : 9788869384554

122 – Galletta, G. (2021). Astrobiologia: la ricerca di vita nello spazio. p. 1-250, Padova: Padova University Press, ISBN 978-88-6938-229-1

121 – Galletta, G., G. (2017). Cosmos 2017. p. 1-137, Montebelluna (TV): Museo di Storia Naturale e Archeologia di Montebelluna, ISBN: 978-88-97241-05-8

120 - Claudi, R., Pace, E., Ciaravella, A., Micela, G., Piccioni, G., Billi, D., Cestelli Guidi, M., Coccola, L., Erculiani, M. S., Fedel, M., Galletta, G., Giro, E., La Rocca, N., Morosinotto, T., Poletto, L., Schierano, D., Stefani, S. (2016). Atmosphere in a Test Tube. Memorie della Società Astronomica Italiana, vol. 87, p. 104-111, ISSN: 1824-016X

119 - Erculiani, M. S., Claudi, R., Cocola, L., Giro, E., La Rocca, N., Morosinotto, T., Poletto, L., Barbisan, D., Billi, D., Bonato, M., D'Alessandro, M., Galletta, G., Meneghini, M., Trivellin, N., Cestelli Guidi, M., Pace, E., Schierano, D., Micela, G. (2016). Atmospheres in a Test Tube: state of the art at the Astronomical Observatory of Padova. Memorie della Società Astronomica Italiana, vol. 87, p. 112-120, ISSN: 1824-016X

118 - Claudi R., Erculiani M.S., Galletta G., Billi D., Pace E., Schierano D., Giro E., D'Alessandro M. (2016). Simulating super earth atmospheres in the laboratory. International Journal of Astrobiology, vol. 15, p. 35-44, ISSN: 1473-5504, doi: 10.1017/S1473550415000117

117 - Buson L.M, Bettoni D., Mazzei P., Galletta G. (2015). UGC 7639: A dwarf galaxy in the Canes Venatici I cloud. Advances in Astronomy, vol. 2015, p. 1-10, ISSN: 1687-7969, doi: 10.1155/2015/274968

116 – Bettoni, D., Marino, A., Rampazzo, R., Plana, H., Rosado, M., Galletta, G., Mazzei, P., Bianchi, L., Buson, L. M., Ambrocio-Cruz, P., Gabbasov, R. (2015). Tracing the evolution within nearby galaxy groups: a multi-wavelength approach. In: Proceedings of the International Astronomical Union, vol. 10, p. 119, Cambridge University Press, ISSN: 1743-9213, luglio 2014, doi: 10.1017/S1743921314004815

115 - Mazzei, P., Marino, A., Rampazzo, R., Galletta, G., Bettoni, D. (2014). Catching spiral - S0 transition in groups. Insights from SPH simulations with chemo-photometric implementation. Advances in Space Research, vol. 53, p. 950-962, ISSN: 0273-1177, doi: 10.1016/j.asr.2013.06.001

114 - Marino, A., L. Bianchi, Mazzei, P., Rampazzo, R., Galletta, G. (2014). Galaxy evolution in groups. USGC U268 and USGC U376 in the Leo cloud. Advances in Space Research, vol. 53, p. 920-927, ISSN: 0273-1177, doi: 10.1016/j.asr.2013.09.029

113 - Bettoni, D., Mazzei, P., Rampazzo, R., Marino, A., Galletta, G., Buson, L.M. (2014). The UV window on counter rotating ETGs: insight from SPH simulations with chemo-photometric implementation. Astrophysics and Space Science, p. 1-6, ISSN: 0004-640X, doi: 10.1007/s10509-014-1973-0

112 - Erculiani, M. S., Claudi, R. U., Giro, E., Galletta, G., D’Alessandro, M., Farsisato, G., Lessio, L., Micela, G., Billi, D. (2014). Interpreting EChO's future data: biological laboratory extimates under M star's planetary surface conditions. In: Space telescopes and instrumentation 2014: optical, infrared, and millimeter wave. vol. 9143, Society of Photo-Optical Instrumentation Engineers (SPIE)., ISBN: 9780819496119, Montreal, Canada, Agosto 2014, doi: 10.1117/12.2055854

111 - Claudi, R. U., Erculiani, M. S., Micela, G., D’Alessandro, M., Galletta, G., Giro, E., Adriani, A., Altieri, F., Bellucci, G., Billi, D., Cecchi-Pestellini, C., Ciaravella, A., Filacchione, G., Gilli, G., Giuranna, M., Grassi, D., Leto, G., Pace, E., Palumbo, M. E., Piccioni, G., Scuderi, S., Strazzulla, G., Turrini, D. (2014). Preparing EChO space mission: laboratory simulation of planetary atmospheres. In: Space telescopes and instrumentation 2014: optical, infrared, and millimeter wave. vol. 9143, p. 1-12, ISBN: 9780819496119, Montreal, Canada, August 2014, doi: 10.1117/12.2055115

110 - Bettoni, D., Mazzei, P., Marino, A., Rampazzo, R., Galletta, G., Buson L. M.(2014). The Ultraviolet View of Multi-Spin Galaxies: Insight from Smooth Particle Hydrodynamic Simulations. In: Multi-Spin Galaxies. vol. 486, p. 35-38, ASP Conference Series, Napoli, ottobre 2013

109 - Marino, A., Plana, H., Rampazzo, R., Bianchi, L., Rosado, M., Bettoni, D., Galletta, G., Mazzei, P., Buson, L., Ambrocio Cruz, P., Gabbasov, R. F. (2013). Galaxy evolution in nearby loose groups - II. Photometric and kinematic characterization of USGC U268 and USGC U376 group members in the Leo cloud. Monthly Notices of the Royal Astronomical Society, vol. 428, p. 476-501, ISSN: 0035-8711, doi: 10.1093/mnras/sts039

108 - Marino, A., Mazzei, P., Rampazzo, R., Bianchi, L., Galletta, G., Bettoni, D., Buson, L. M. (2013). Early-type galaxies across the UV-optical color magnitude diagram. In: European Week of Astronomy and Space Science. p. 1, Turku, Finland, 8-12 July 2013

107 - Spavone, M., Iodice, E., Bettoni, D., Galletta, G., Mazzei, P., Reshetnikov, V. (2012). A new photometric investigation of the double-ringed galaxy ESO 474−G26: unveiling the formation scenario. Monthly Notices of the Royal Astronomical Society, vol. 426, p. 2003-2018, ISSN: 0035-8711, doi: 10.1111/j.1365-2966.2012.21815.x

106 - Bettoni, D., L. Buson, Mazzei, P., Galletta, G. (2012). Insight into the evolution of the innermost region of the NGC1023 Group. Monthly Notices of the Royal Astronomical Society, p. no, ISSN: 0035-8711, doi: 10.1111/j.1365-2966.2012.21111.x

105 – Pace, E., Piccioni, M, Micela, G., Galletta, G., De Sio, A., Grilli, A., Cestelli Guidi, M., Scuderi, S, Giro, E., Focardi, M., Claudi, R. (2012). Planetary atmospheres in a test tube. In: 39TH COSPAR Scientific Assembly. vol. 39, p. 1425, Mysore, India, 14-22 July 2012

104 – Buson, L. M., Bettoni, D., Galletta, G. (2011). An extended ultraviolet ring around the SB0 galaxy NGC 4262. Astrophysics and Space Science, vol. 98, p. 1-6, ISSN: 0004-640X, doi: 10.1007/s10509-011-0682-1

103 - Bettoni, D., Galletta, G., Rampazzo, R., Marino, A., Mazzei, P., Buson, L.M. (2011). NGC 3934: a shell galaxy in a compact galaxy environment. Astronomy and Astrophysics, vol. 534, p. A24-1-A24-13, ISSN: 0004-6361, doi: 10.1051/0004-6361/201117106

102 - Galletta, G., G. Bertoloni, D’Alessandro, M. (2011). New approaches to the exploration: planet Mars and bacterial life. In: ASTRO-PH 2011ARXIV1102.4438G - Proceedings of IAU Symposium 269. vol. 269, p. 1-4, Padova, Gennaio 2010

101 - Bettoni, D., Galletta, G., Rampazzo, R., Marino, A., Mazzei, P., Buson,L.M. (2011). The molecular gas rich galaxy NGC 3934: a multiwavelenght view. In: Posters from the Proceedings of the 280th Symposium of the International Astronomical Union. p. 1, Toledo, Spain, May 30-June 3, 2011

100 - Bettoni, D., Buson, L.M., Galletta, G. (2010). NGC 4262: a Virgo galaxy with an extended ultraviolet ring. Astronomy and Astrophysics, vol. 519, p. A72-1-A72-7, ISSN: 0004-6361, doi: 10.1051/0004-6361/201014750

99 - Galletta, G., G. Bertoloni, D’Alessandro, M. (2010). Bacterial survival in Martian conditions. In: ASTRO-PH ARXIV:1002.4077. p. 1-5, ESA/ESRIN in Frascati, Italy., 25 - 27 November 2009

98 - Galletta, G., D’Alessandro, M., G. Bertoloni, F. Castellani (2010). Surviving on Mars: test with LISA simulator. In: Proceedings of the International Astronomical Union - Highlights of Astronomy. vol. 15, p. 686-687, Cambridge: Cambridge University Press, Rio de Janeiro, doi: 10.1017/S1743921310010951

97 - Guidetti R, Altiero T, Cesari M, Rizzo A.M, Bertolani R, Galletta, G., D’Alessandro, M., Rebecchi L (2010). Tardigrades living in extreme environments have naturally selected prerequisites useful to space conquer. In: 38th COSPAR Scientific Assembly. COSPAR, Bremen, Germany, 18-15 July 2010

96 - Marino, A., E. Iodice, R. Tantalo, L. Piovan, Bettoni, D., L.M. Buson, C. Chiosi, Galletta, G., Rampazzo, R., Rich R. M. (2009). GALEX UV properties of the polar ring galaxy MCG-05-07-001 and the shell galaxies NGC 1210 and NGC 5329. Astronomy and Astrophysics, vol. 508, p. 1235-1252, ISSN: 0004-6361, doi: 10.1051/0004-6361/200911819

95 - M. Spavone, Iodice E, Calvi R, Bettoni, D., Galletta, G., Longo G, Mazzei P, Minervini G. (2009). Revisiting the formation History of the minor-axis dust lane galaxy NGC1947. Monthly Notices of the Royal Astronomical Society, vol. 393, p. 317-328, ISSN: 0035-8711, doi: 10.1111/j.1365-2966.2008.14231.x

94 - R. Visentin, G. Bertoloni, D’Alessandro, M., Galletta, G. (2009). First Results from Mars Simulator LISA. In: 2008 ISSOL meeting. Origins of life and evolution of the biosphere, vol. 39, p. 375, ISSN: 0169-6149, Firenze, 24–29 August 2008. doi: 10.1007/s11084-009-9164-7

93 - V. Casasola, F. Combes, Bettoni, D., M. Pohlen m, Galletta, G., F. Tenaglia (2008). Are truncated stellar disks linked to the molecular gas density?. In: Sience with the Atacama Large Millimeter Array: Astrophysics and Space Science, vol. 313, ISSN: 0004-640X, Madrid, 13-17 November 2006

92 - V. Casasola, F. Combes, Galletta, G., Bettoni, D. (2008). Molecular Gas and Star Formation in M81. In: Pathways Through an Eclectic Universe, J. H. Knapen, T. J. Mahoney, and A. Vazdekis (Eds.), ASP Conf. Ser. vol. 390, p. 170-171

91 - Marino, A., Rampazzo, R., R. Tantalo, Bettoni, D., L.M. Buson, Chiosi C, Galletta, G. (2008). The GALEX UV emission in shell galaxies. In: Formation and evolution of galaxies disks J.G. Funes, S.J., and E. M. Corsini (Eds.), ASP Conf. Ser., 2008. vol. 396, p. 279-283

90 - Bettoni, D., Marino, A., L.M. Buson, C. Chiosi, Galletta, G., Rampazzo, R., R. Tantalo, Rich M. (2008). Tracing Galaxy Evolution in the Field: the UV Emission in Shell Galaxies Mapped by GALEX. In: mapping the Galaxy and nearby galaxies, Astrophysics and Space Science Proceedings. p. 311, Springer Science+Business Media, ISBN: 9780387727677

89 - Galletta, G. (2008). Cosmos - viaggio alla scoperta dell'universo. p. 1-137, Montebelluna (TV): Museo di St. naturale e Archeologia di Montebelluna, ISBN: 8890141174

88 - Galletta, G., D’Alessandro, M., G. Bertoloni, G. Fanti, Dainese E, Pelizzo M, Ferri F, Pavarin D, Bettanini C, Bianchini G, Debei S (2007). LISA: Mars and the limits of life. Memorie della Società Astronomica Italiana, vol. 78, p. 608-611, ISSN: 1824-016X

87 - V. Casasola, F. Combes, Bettoni, D., Galletta, G. (2007). Molecular clouds in the center of M81. Astronomy and Astrophysics, vol. 473, p. 771-781, ISSN: 0004-6361, doi: 10.1051/0004-6361:20077883

86 - Galletta, G., V. Casasola, L. Piovan, E. Merlin, Bettoni, D. (2007). Relations between interstellar medium tracers in galaxies. Astronomy and Astrophysics, vol. 462, p. 495-506, ISSN: 0004-6361

85 - Rampazzo, R., Marino, A., R. Tantalo, Bettoni, D., L.M. Buson, Chiosi C, Galletta, G., Grueztbauch, R., Rich, R. M. (2007). The GALEX UV emission in shell galaxies: tracing galaxy "rejuvenation" episodes. Monthly Notices of the Royal Astronomical Society, vol. 381, p. 245-262, ISSN: 0035-8711, doi: 10.1111/j.1365-2966.2007.12246.x

84 - L.M. Buson, Bettoni, D., Marino, A., Chiosi C, Galletta, G., Rampazzo, R., R. Tantalo, Rich R.M (2007). Insights about induced SFR in the Shell Systems of Early-Type Galaxies from UV (GALEX). In: -. Galaxy evolution across the Hubble time, Edited by F. Combes and J. Palous,. Prague, Czech Republic, 14-17 August, 2006, vol. 235, p. 305, Cambridge: Cambridge University Press

83 - V. Casasola, F. Combes, Galletta, G., Bettoni, D. (2007). Molecular gas and star formation in M81. In: Pathways through an eclectic universe, J. H. Knapen, T. J. Mahoney, and A. Vazdekis (Eds.), ASP Conf. Ser., 2007. p. 170-171, J. H. Knapen, T. J. Mahoney, and A. Vazdekis, ASP, Tenerife, 23-27 Aprile 2007

82 - V. Casasola, Piovan, L., Galletta, G., Bettoni, D., Merlin, E. (2007). Study of ISM tracers in galaxies. In: From stars to galaxies: building the pieces to build up the universe, Vallenari et al. eds.,. vol. 374, p. 491-492, ASP Conference Series

81 - Galletta, G., G. Rodighiero, Bettoni, D., Moles, M., Varela, J. (2006). Isolated galaxies: residual of primordial building blocks?. Astronomy and Astrophysics, vol. 456, p. 91-95, ISSN: 0004-6361, doi: 10.1051/0004-6361:20065026

80 - Galletta, G., Ferri, F., Fanti, G., M. D'Alessandro, G. Bertoloni, Pavarin, D., C. Bettanini Fecia di Cossato, P. Cozza, P. Pretto, Bianchini, G., Debei, S. (2006). S.A.M., the Italian Martian Simulation Chamber. Origins of life and evolution of the biosphere, vol. 36, p. 625-627, ISSN: 0169-6149, doi: 10.1007/s11084-006-9046-1

79 - Buson, L., Bettoni, D., Rampazzo, R., Marino, A., Galletta, G., C. Chiosi, R. Tantalo, Rich, M. (2006). Insight about induced SFR in the shell system of early-type galaxies from UV observations. In: Galaxy evolution across the Hubble time. vol. 235, p. 108-109, Prague, Czech Republic, 14-17 August, 2006, doi: 10.1017/S1743921306006703

78 - Galletta, G., Sergi V. (2005). Astrobiologia: Le frontiere della Vita. p. 1-313, Milano:Hoepli, ISBN: 8820334240

77 - Varela, J., Moles, M., Márquez, I., Galletta, G., Masegosa, J., Bettoni, D. (2004). Properties of Isolated Disk Galaxies. Astronomy and Astrophysics, vol. 420, p. 873-879, ISSN: 0004-6361, doi: 10.1051/0004-6361:20035697

76 - Casasola, V., Bettoni, D., Galletta, G. (2004). The gas content of peculiar galaxies: strongly interacting systems. Astronomy and Astrophysics, vol. 422, p. 941-950, ISSN: 0004-6361, doi: 10.1051/0004-6361:20040283

75 - V. Casasola, Bettoni, D., Galletta, G. (2004). The gas content of peculiar galaxies: strongly interacting systems. In: The many scales of the Universe - JENAM 2004, ed. J. C. Del Toro Iniesta, Kluwer.

74 - Casasola, V., Bettoni, D., Galletta, G. (2004). Gas content in 1038 interacting galaxies. CDS Strasbourg Database J/A+A/422/941

73 - Varela, J., Moles, M., Márquez, I., Galletta, G., Masegosa, J., Bettoni, D. (2004). The properties of isolated spiral galaxies. CDS Strasbourg Database J/A+A/420/873

72 - Bettoni, D., Galletta, G., Garcia-Burillo, S. (2003). A new catalogue of ISM content of normal galaxies. Astronomy and Astrophysics, vol. 405, p. 5-14, ISSN: 0004-6361, doi: 10.1051/0004-6361:20030557

71 - Márquez, I., Masegosa, J., Moles, M., Varela, J, Bettoni, D., Galletta, G. (2003). Isolated and mildly interacting spiral galaxies: rotation curves and metallicity. Astrophysics and Space Science, vol. 284, p. 711-714, ISSN: 0004-640X, doi: 10.1023/A:1024007500977

70 - Bettoni, D., Garcia-Burillo, S., Galletta, G., Casasola, V. (2003). Gas content in galaxies: peculiar vs. normal. In: Star and structure formation: from first light to the Milky Way. August 18 – 22, 2003

69 - Bettoni, D., Galletta, G., Garcia-Burillo, S. (2003). Catalogue of ISM content of normal galaxies. CDS Strasbourg Database J/A+A/405/5

68 - Márquez, I., Masegosa, J., Moles, M., Varela, J., Bettoni, D., Galletta, G. (2002). Rotation curves and metallicity gradients from HII regions in spiral galaxies. Astronomy and Astrophysics, vol. 393, p. 389-407, ISSN: 0004-6361, doi: 10.1051/0004-6361:20021036

67 - Márquez, I., Masegosa, J., Moles, M., Varela, J., Bettoni, D., Galletta, G. (2002). Rotation curves and metallicity gradients from HII regions in spiral galaxies. CDS Strasbourg Database, J/A+A/393/389

66 - Bettoni, D., Galletta, G. (2001). Radial velocities of giant M stars near the Ecliptic. Astronomy and Astrophysics, vol. 368, p. 593-594, ISSN: 0004-6361

65 - Bettoni, D., Galletta, G., Garcia Burillo S., Rodriguez Franco A. (2001). The gas content of peculiar galaxies: counterrotators and polar rings. Astronomy and Astrophysics, vol. 374, p. 421-434, ISSN: 0004-6361, doi: 10.1051/0004-6361:20010717

64 - Bettoni, D., Galletta, G., Francisco Prada (2001). The visible environment of galaxies with counterrotation. Astronomy and Astrophysics, vol. 374, p. 83-91, ISSN: 0004-6361, doi: 10.1051/0004-6361:20010691

63 - Galletta, G., Pignatelli E. (2001). Anatomy of Giant Spiral galaxies. In: Galaxy disks and disk galaxies, Astron. Society of Pacific Conference Series. vol. 230, p. 563-565

62 - Bettoni, D., Galletta, G., Moles, M., Varela, J., Márquez, I., Masegosa, J. (2001). Kinematical properties of a sample of isolated disk galaxies. In: Galaxy disks and disk galaxies, Astron. Society of Pacific Conference Series. vol. 230, p. 271-272

61 – Sergi, V., Celotti, L., Galletta, G., Turatto, M. (2001). Nearby supernova explosions and radiation effects on the Earth's environment. In: ESA Special Publications. vol. 496, p. 409-412

60 - Bettoni, D., Galletta, G. (2001). Stellar kinematical of two polar ring spirals. In: Galaxy disks and disk galaxies, Astron. Society of Pacific Conference Series. vol. 230, p. 433-434

59 – Guarise, G., Galletta, G., Secco, L. (2001). The cut-off radius and the scale length induced by the dark matter halo. In: JENAM 2001. vol. 18, p. 202, Monaco, 10-15 September 2001

58 – Cappellaro, E., Turatto, M., Pizzella, A., Corsini, E.M., Galletta, G. (2000). Supernova 2000C in NGC 2415. Circular - Central Bureau For Astronomical Telegrams, International Astronomical Union, vol. N. 7352, p. 1, ISSN: 0081-0304

57 – Turatto, M., Galletta, G., Cappellaro, E. (2000). Supernova 2000E in NGC 6951. Circular - Central Bureau For Astronomical Telegrams, International Astronomical Union, vol. n. 7351, p. 1, ISSN: 0081-0304

56 - Bettoni, D., Garcia-Burillo, S., Rodriguez-Franco, A., Galletta, G. (2000). Evolution of Gas Accreting Galaxies: Detection of Molecular Gas. In: Dynamics of galaxies: from the early universe to the present, ASP Conf. Series. vol. 197, p. 129

55 - Bettoni, D., Galletta, G., Prada, F. (2000). The Visible Environment of Gas Accreting Galaxies. In: Dynamics of galaxies: from the early universe to the present, ASP Conf. Series. vol. 197, p. 125

54 – Pignatelli, E., Galletta, G. (1999). Multi-component models for disk galaxies. I. Stellar rotation and anisotropy. Astronomy and Astrophysics, vol. 349, p. 369-380, ISSN: 0004-6361

53 - Bettoni, D., Galletta, G. (1997). A survey of the stellar rotation in barred galaxies. Astronomy and Astrophysics, vol. 124, p. 61-74, ISSN: 0004-6361, doi: 10.1051/aas:1997180

52 - Galletta, G., Sage, L. J., Sparke, L. S. (1997). Molecular gas in polar-ring galaxies. Monthly Notices of the Royal Astronomical Society, vol. 284, p. 773-784, ISSN: 0035-8711

51 – Brocca, C., Bettoni, D., Galletta, G. (1997). The visible environment of polar ring galaxies. Astronomy and Astrophysics, vol. 326, p. 907-914, ISSN: 0004-6361

50 – Pignatelli, E, Galletta, G. (1997). Dynamical models of S0 and Sa galaxies. In: Dark and visible matter in galaxies; Astron. Society of Pacific Conf. Series. vol. 117, p. 136

49 - Bettoni, D., Galletta, G. (1997). A survey of the stellar rotation in barred galaxies. CDS Strasbourg Database J/A+AS/124/61

48 - Galletta, G. (1996). Counterrotation and Barred Galaxies. In: Barred galaxies. Astronomical Society of the Pacific Conference Series. vol. 91, p. 429-439

47 - Bettoni, D., Fasano, G., Galletta, G. (1996). Photometrical Mapping in Barred Galaxies: Analysis of the Different Components. In: Barred galaxies. Astronomical Society of the Pacific Conference Series. vol. 91, p. 97-98

46 - Galletta, G., Tomadini, L. (1996). Tethys and Nemesis: astronomical problems. Testing an astronomical explanation of mass extinctions. In: Shallow Tethis 4 - Supplemento Annali Musei Civici di Rovereto. 8-11 september 1994, vol. 11, p. 7-18

45 – Ciri, R, Bettoni, D., Galletta, G. (1995). A Massive Counter-Rotating Gas Disk in a Spiral Galaxy. Nature, vol. 375, p. 661-663, ISSN: 0028-0836

44 – Savoldini, M., Galletta, G. (1994). CO depletion in the protoplanetary disk of Beta Pictoris. Astronomy and Astrophysics, vol. 285, p. 467-468, ISSN: 0004-6361

43 - Sage, L. J., Galletta, G. (1994). Counter-rotating molecular gas in NGC 4546. The Astronomical Jornal, vol. 108, p. 1633-1637, ISSN: 0004-6256, doi: 10.1086/117184

42 - Bettoni, D., Galletta, G. (1994). Study of NGC 4442: A link between bars and boxy bulges. Astronomy and Astrophysics, vol. 281, p. 1-6, ISSN: 0004-6361

41 - Bettoni, D., Galletta, G., Sage, L. J. (1993). Detection of filaments of ionized gas in NGC 4684. Astronomy and Astrophysics, vol. 280, p. 121-127, ISSN: 0004-6361

40 - Sage, L. J., Galletta, G. (1993). Evolution in Dust Lane Ellipticals: Detection of Accreted Molecular Gas. The Astrophysical Jornal, vol. 419, p. 544-560, ISSN: 0004-637X, doi: 10.1086/173507

39 – Arnaboldi, M., Galletta, G. (1993). Kinematical models of warped disks. Astronomy and Astrophysics, vol. 268, p. 411-417, ISSN: 0004-6361

38 – Feretti, L., Bettoni, D., Galletta, G., Giovannini, G. (1993). Radio Emission of Galaxies with Kinematical Evidence of Merger. In: Structure, Dynamics and Chemical Evolution of Elliptical Galaxies. 25-30 May, 1992, p. 703

37 – Magrelli, G., Bettoni, D., Galletta, G. (1992). Face-on disc galaxies. Monthly Notices of the Royal Astronomical Society, vol. 256, p. 500-514, ISSN: 0035-8711

36 - Bertola, F., Galletta, G., Zeilinger, W. W. (1992). The Minor-Axis Dust Lane Elliptical NGC1947. Astronomy and Astrophysics, vol. 254, p. 89-92, ISSN: 0004-6361

35 – Sage, L. J., Galletta, G. (1992). Dynamically Decoupled Gas and Stars in Galaxies. In: American Astronomical Society, 181st AAS Meeting. vol. 24, p. 1123

34 - Bettoni, D., Fasano, G., Galletta, G. (1991). Erratum: "NGC 2217, A Case of Apparent Counterrotation". The Astronomical Jornal, vol. 101, p. 1089, ISSN: 0004-6256

33 - Bettoni, D., Galletta, G., Oosterloo, T. (1991). Stellar and gas kinematics of NGC 4546, the double-spin SBO. Monthly Notices of the Royal Astronomical Society, vol. 248, p. 544-554, ISSN: 0035-8711

32 - BUSON L., Galletta, G., SAGLIA R. P., Zeilinger, W. W. (1991). Supermassive disk galaxies. The Messenger, vol. 63, p. 50-52, ISSN: 0722-6691

31 - Galletta, G., Bettoni, D. (1991). Dynamics and Evolution of Acquired Gaseous Discs. In: Dynamics of disc galaxies: Varberg Castle Sweden. p. 317-322

30 - Galletta, G. (1991). Warps in S0s - Observations Versus Theories. In: Warped disks and inclined rings around galaxies. p. 207-212

29 - Bettoni, D., Fasano, G., Galletta, G. (1990). NGC 2217, a case of apparent counterrotation. The Astronomical Jornal, vol. 99, p. 1789-1797, 2161, ISSN: 0004-6256

28 - Zeilinger, W. W., Galletta, G., Madsen, C. (1990). NGC5084 - a Massive Disk Galaxy with a Tilted Ring. Monthly Notices of the Royal Astronomical Society, vol. 246, p. 324-331, ISSN: 0035-8711

27 - Zeilinger, W. W., Bertola, F., Galletta, G. (1990). Elliptical Galaxies with Dust Lanes. In: Dusty objects in the Universe. p. 227-232

26 - Galletta, G., Bettoni, D., Oosterloo, T., Fasano, G. (1990). Hidden interaction in SBO galaxies. In: NASA, Marshall Space Flight Center, Paired and interacting galaxies: International Astronomical Union Colloquium 124. vol. 124, p. 159-164, NASA

25 - Bertola, F., Galletta, G., Kotanyi, C., Zeilinger, W. W. (1988). A study of major-axis dust-lane ellipticals. Monthly Notices of the Royal Astronomical Society, vol. 234, p. 733-744, ISSN: 0035-8711

24 - Bertola, F., Galletta, G., Capaccioli, M., Rampazzo, R. (1988). Minor-axis kinematics for seven elliptical galaxies. Astronomy and Astrophysics, vol. 192, p. 24-28, ISSN: 0004-6361

23 - Bettoni, D., Galletta, G. (1988). New results about SBO galaxies. The Messenger, vol. 54, p. 51-56, ISSN: 0722-6691

22 - Bettoni, D., Galletta, G., Vallenari, A. (1988). Stellar kinematics in SB0 galaxies - NGC 2983. Astronomy and Astrophysics, vol. 197, p. 69-74, ISSN: 0004-6361

21 - Bettoni, D., Galletta, G. (1988). Stellar kinematics in the SB0 galaxy NGC 6684. Astronomy and Astrophysics, vol. 190, p. 25-60, ISSN: 0004-6361

20 - Galletta, G. (1987). Detection of retrograde gas streaming in the SB0 galaxy NGC 4546. The Astrophysical Jornal, vol. 318, p. 531-535, ISSN: 0004-637X

19 - VARNAS S. R., Bertola, F., Galletta, G., Freeman, K. C., Carter, D. (1987). NGC 5266 - an elliptical galaxy with a dust ring. The Astrophysical Jornal, vol. 313, p. 69-88, ISSN: 0004-637X, doi: 10.1086/164949

18 - Bettoni, D., Galletta, G. (1987). Velocity and velocity dispersion fields of NGC 6684 - an SBO galaxy with a ring. The Messenger, vol. 48, p. 13-16, ISSN: 0722-6691

17 - Galletta, G. (1986). CCD observations of supernova 1986G in CEN A. The Messenger, vol. 44, p. 2, ISSN: 0722-6691

16 - Galletta, G. (1986). The unusual barred SO galaxy NGC 4546. The Messenger, vol. 45, p. 18-20, ISSN: 0722-6691

15 - Bertola, F., Galletta, G., Zeilinger, W. W. (1985). Warped dust lanes in elliptical galaxies - Transient or stationary phenomena?. The Astrophysical Jornal, vol. 292, p. L51-L55, ISSN: 0004-637X

14 - Bertola, F., Casini C., Bettoni, D., Galletta, G., Noreau L., Kronberg P. P. (1984). NGC 3448 revisited - A combined optical, radio, and UV investigation. The Astronomical Jornal, vol. 89, p. 350-355, ISSN: 0004-6256

13 - Galletta, G. (1984). Observable properties of non-axisymmetric galaxies. II - Photometric parameters. Astrophysics and Space Science, vol. 103, p. 39-54, ISSN: 0004-640X, doi: 10.1007/BF00650042

12 - Galletta, G. (1983). Observable properties of non-axisymmetric galaxies. I Geometrical parameters. Astrophysics and Space Science, vol. 92, p. 335-346, ISSN: 0004-640X

11 – Hayli, A., Desolneux, N., Galletta, G. (1983). Periodic orbits in a three-dimensional potential. Astronomy and Astrophysics, vol. 122, p. 137-142, ISSN: 0004-6361

10 – Noreau, L., Kronberg, P. P., Bertola, F., Bettoni, D., Galletta, G., Casini C. (1983). A Multi-Frequency Study of The Irregular Galaxy NGC 3448. In: Bulletin of the American Astronomical Society. Bulletin of the American Astronomical Society, vol. 15, p. 933, ISSN: 0002-7537, Las Vegas

9 - Bettoni, D., Galletta, G. (1982). Accurate optical positions of M 82 knots. Astronomy and Astrophysics, vol. 113, p. 344-347, ISSN: 0004-6361

8 - Galletta, G., Recilla-Cruz E. (1982). The large scale trend of rotation curves in the spiral galaxies NGC 1068 and NGC 3310. Astronomy and Astrophysics, vol. 112, p. 361-365, ISSN: 0004-6361

7 - Benacchio, L., Galletta, G. (1981). UV observation of the nucleus of NGC 3077. The Astrophysical Jornal, vol. 243, p. L65-L68, ISSN: 0004-637X, doi: 10.1086/183444

6 - Galletta, G. (1980). A correlation between isophotal twisting and flattening in elliptical galaxies. Astronomy and Astrophysics, vol. 81, p. 179-181, ISSN: 0004-6361

5 - Benacchio, L., Galletta, G. (1980). Triaxiality in elliptical galaxies. Monthly Notices of the Royal Astronomical Society, vol. 193, p. 885-894, ISSN: 0035-8711

4 - Bertola, F., Galletta, G. (1979). Ellipticity and twisting of isophotes in elliptical galaxies. Astronomy and Astrophysics, vol. 77, p. 363-365, ISSN: 0004-6361

3 - Bertola, F., Galletta, G. (1978). A new type of galaxy with prolate structure. The Astrophysical Jornal, vol. 226, p. L115-L118, ISSN: 0004-637X, doi: 10.1086/182844

2 - Bertola, F., Galletta, G. (1978). Accurate Positions of Faint Optical Objects in the Fields of Radiosources: I. The Coma Cluster Field. Astronomy and Astrophysics Supplement Series, vol. 34, p. 267-277, ISSN: 0365-0138

1 - Bertola, F., Galletta, G. (1978). Accurate Positions of Faint Optical Objects in the Fields of Radiosources: II. The Perseus Cluster Field. Astronomy and Astrophysics Supplement Series, vol. 34, p. 279-284, ISSN: 0365-0138