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Tidal Dwarf Galaxies Around a Post-merger Galaxy, NGC 4922

Sheen, Yun-Kyeong and Jeong, Hyunjin and Yi, Sukyoung K. and Ferreras, Ignacio and Lotz, Jennifer M. and Olsen, Knut A. G. and Dickinson, Mark and Barnes, Sydney and Park, Jang-Hyun and Ree, Chang H. and Madore, Barry F. and Barlow, Tom A. and Conrow, Tim and Foster, Karl and Friendman, Peter G. and Lee, Young-Wook and Martin, D. Christopher and Morrissey, Patrick and Neff, Susan G. and Schiminovich, David and Seibert, Mark and Small, Todd and Wyder, Ted K. (2009) Tidal Dwarf Galaxies Around a Post-merger Galaxy, NGC 4922. Astronomical Journal, 138 (6). pp. 1911-1916. ISSN 0004-6256.

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One possible channel for the formation of dwarf galaxies involves birth in the tidal tails of interacting galaxies. We report the detection of a bright UV tidal tail and several young tidal dwarf galaxy (TDG) candidates in the post-merger galaxy NGC 4922 in the Coma cluster. Based on a two-component population model (combining young and old stellar populations), we find that the light of tidal tail predominantly comes from young stars (a few Myr old). The Galaxy Evolution Explorer ultraviolet data played a critical role in the parameter (age and mass) estimation. Our stellar mass estimates of the TDG candidates are ~10^(6–7) M_☉, typical for dwarf galaxies.

Item Type:Article
Related URLs:
URLURL TypeDescription
Lotz, Jennifer M.0000-0003-3130-5643
Olsen, Knut A. G.0000-0002-7134-8296
Dickinson, Mark0000-0001-5414-5131
Madore, Barry F.0000-0002-1576-1676
Foster, Karl0000-0001-5800-5531
Martin, D. Christopher0000-0002-8650-1644
Morrissey, Patrick0000-0001-8177-1023
Seibert, Mark0000-0002-1143-5515
Additional Information:© 2009 American Astronomical Society. Print publication: Issue 6 (2009 December); received 2009 July 28; accepted for publication 2009 October 9; published 2009 November 5. We are indebted to Giuseppe Gavazzi and Alessandro Boselli for supporting our use of the GALEX data made public after their guest investigation acquired them but prior to their use. We thank the anonymous referee for various clarifications. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Doyak 20090078756). S.K.Y. also acknowledges support from Korea Astronomy and Space Science Institute. We have used the GALEX UV data obtained from the Multimission Archive at the Space Telescope Science Institute (MAST). GALEX is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034. We are grateful to the Lowell Observatory for granting observing time and hospitality during our visit.
Group:Space Astrophysics Laboratory
Funding AgencyGrant Number
Ministry of Education, Science and Technology (Korea)Doyak 20090078756
Korea Astronomy and Space Science Institute (KASI)UNSPECIFIED
Subject Keywords:galaxies: dwarf; galaxies: individual (NGC 4922); galaxies: interactions; galaxies: starburst; ultraviolet: galaxies
Issue or Number:6
Record Number:CaltechAUTHORS:20091209-093951716
Persistent URL:
Official Citation:Tidal Dwarf Galaxies Around a Post-merger Galaxy, NGC 4922 Yun-Kyeong Sheen, Hyunjin Jeong, Sukyoung K. Yi, Ignacio Ferreras, Jennifer M. Lotz, Knut A. G. Olsen, Mark Dickinson, Sydney Barnes, Jang-Hyun Park, Chang H. Ree, Barry F. Madore, Tom A. Barlow, Tim Conrow, Karl Foster, Peter G. Friendman, Young-Wook Lee, D. Christopher Martin, Patrick Morrissey, Susan G. Neff, David Schiminovich, Mark Seibert, Todd Small, and Ted K. Wyder 2009 The Astronomical Journal 138 1911-1916 doi: 10.1088/0004-6256/138/6/1911
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16919
Deposited By: Jason Perez
Deposited On:09 Dec 2009 21:42
Last Modified:09 Mar 2020 20:57

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