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Dark matter content and dynamical masses of ultra-diffuse galaxies in the Coma cluster

Published online by Cambridge University Press:  30 October 2025

Igor V. Chilingarian Open the ORCID record for Igor V. Chilingarian [Opens in a new window] ,
Kirill A. Grishin ,
Anton V. Afanasiev ,
Anton Mironov ,
Daniel Fabricant ,
Sean Moran ,
Nelson Caldwell ,
Ivan Yu. Katkov  and
Irina Ershova
Igor V. Chilingarian*
Affiliation:
Center for Astrophysics – Harvard and Smithsonian, 60 Garden St. Cambridge, MA, 02138 USA Sternberg Astronomical Institute, Moscow State University, 13 Universitetsky pr., Moscow, Russia
Kirill A. Grishin
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 13 Universitetsky pr., Moscow, Russia Université Paris Cité, CNRS, Astroparticule et Cosmologie, F-75013 Paris, France
Anton V. Afanasiev
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 13 Universitetsky pr., Moscow, Russia LESIA, Observatoire de Paris, 5 place Jules Janssen, 92195, Meudon, France
Anton Mironov
Affiliation:
Faculty of Space Research, Moscow State University, 1 Leninskie Gory, bld. 52, Moscow, Russia
Daniel Fabricant
Affiliation:
Center for Astrophysics – Harvard and Smithsonian, 60 Garden St. Cambridge, MA, 02138 USA
Sean Moran
Affiliation:
Center for Astrophysics – Harvard and Smithsonian, 60 Garden St. Cambridge, MA, 02138 USA
Nelson Caldwell
Affiliation:
Center for Astrophysics – Harvard and Smithsonian, 60 Garden St. Cambridge, MA, 02138 USA
Ivan Yu. Katkov
Affiliation:
Sternberg Astronomical Institute, Moscow State University, 13 Universitetsky pr., Moscow, Russia New York University Abu Dhabi, Saadiyat Island, PO Box 129188, Abu Dhabi, UAE
Irina Ershova
Affiliation:
Faculty of Space Research, Moscow State University, 1 Leninskie Gory, bld. 52, Moscow, Russia
*
email: igor.chilingarian@cfa.harvard.edu
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Abstract

Ultra-diffuse galaxies (UDGs) are spatially extended, low surface brightness stellar systems with regular elliptical-like morphology found in large numbers in galaxy clusters and groups. Studies of the internal dynamics and dark matter content of UDGs have been hampered by their low surface brightnesses. We identified a sample of low-mass early-type post-starburst galaxies, ‘future UDGs’ in the Coma cluster still populated with young stars, which will passively evolve into UDGs in the next 5–10 Gyr. We collected deep observations for a sample of low-mass early-type galaxies in the Coma cluster using MMT Binospec, which includes present-day and future UDGs. We derived their dark matter content within a half-light radius (70–95 %) and total dynamical masses (M200 = 5.5 · 109 − 1.4·1011 M⊙) assuming the Burkert density profile and assess how different proposed evolutionary channels affect dark and visible matter in UDGs. We also discuss observational methodology of present and future UDG studies.

Keywords

ultradiffuse galaxiesdwarf galaxiesdynamics of galaxiesstellar populations

Information

Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S379: Dynamical Masses of Local Group Galaxies , December 2023 , pp. 307 - 313
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Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of International Astronomical Union

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