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Diffuse post-starburst galaxies: a smoking gun of formation of ultra-diffuse galaxies via ram pressure stripping

Published online by Cambridge University Press:  30 October 2019

Igor V. Chilingarian Open the ORCID record for Igor V. Chilingarian [Opens in a new window] ,
Kirill A. Grishin ,
Anton V. Afanasiev ,
Daniel Fabricant  and
Ivan Yu. Katkov
Igor V. Chilingarian
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St. MS09, Cambridge MA 02138, USA email: [email protected] Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, 13 Universitetski prospect, Moscow, 119234, Russia
Kirill A. Grishin
Affiliation:
Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, 13 Universitetski prospect, Moscow, 119234, Russia Department of Physics, M.V. Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119234, Russia
Anton V. Afanasiev
Affiliation:
Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, 13 Universitetski prospect, Moscow, 119234, Russia Department of Physics, M.V. Lomonosov Moscow State University, 1 Leninskie Gory, Moscow, 119234, Russia
Daniel Fabricant
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St. MS09, Cambridge MA 02138, USA email: [email protected]
Ivan Yu. Katkov
Affiliation:
Sternberg Astronomical Institute, M.V. Lomonosov Moscow State University, 13 Universitetski prospect, Moscow, 119234, Russia
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Abstract

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Ultra-diffuse galaxies (UDGs) have sizes comparable to the Milky Way and stellar masses of about 1/1000 of it. They attracted a lot of attention as possible “dark galaxies” heavily dominated by dark matter, however, no reliable dynamical mass estimates were done because of their extremely low surface brightness. We have recently found 13 gas free diffuse young (300–500 Myr) post-starburst galaxies (PSGs) without ongoing star formation in Coma and Abell 2147, which, should they continue to evolve passively, will become UDGs in 5 Gyr. We obtained deep spectroscopic observations for 11 diffuse PSGs and derived their internal kinematics and stellar population properties. All of them possess disk-like kinematics (substantial rotation, low stellar velocity dispersion) and likely experienced starburst episodes prior to the star formation quenching by ram pressure stripping. Our results suggest that at least some UDGs were “normal” intermediate to large-sized disk galaxies in the past, which were later quenched by dense environment.

Keywords

galaxies: dwarfgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 365 - 368
Copyright
© International Astronomical Union 2019 

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