TIDAL DWARF GALAXIES AROUND A POST-MERGER GALAXY, NGC 4922

Journal Article · Mon Dec 14 23:00:00 EST 2009 · Astronomical Journal (New York, N.Y. Online)

DOI:https://doi.org/10.1088/0004-6256/138/6/1911; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21301501

Sheen, Yun-Kyeong; Jeong, Hyunjin; Lee, Young-Wook ^[1]; Ferreras, Ignacio ^[2]; Lotz, Jennifer M; Olsen, Knut A. G.; Dickinson, Mark ^[3]; Barnes, Sydney ^[4]; Park, Jang-Hyun; Ree, Chang H ^[5]; Madore, Barry F ^[6]; Barlow, Tom A; Conrow, Tim; Foster, Karl; Friendman, Peter G; Martin, D Christopher; Morrissey, Patrick ^[7]; Neff, Susan G ^[8]; Schiminovich, David ^[9]

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1. Department of Astronomy, Yonsei University, Seoul 120-749 (Korea, Republic of)
2. Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT (United Kingdom)
3. National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719 (United States)
4. Lowell Observatory, Flagstaff, AZ 86001 (United States)
5. Korea Astronomy and Space Science Institute, Hwaam 61-1, Yuseong, Daejeon 305-348 (Korea, Republic of)
6. Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101 (United States)
7. California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125 (United States)
8. Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
9. Department of Astronomy, Columbia University, New York, NY 10027 (United States)

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 {approx}10{sup 6-7} M {sub sun}, typical for dwarf galaxies.

• OSTI ID: 21301501
• Journal Information: Astronomical Journal (New York, N.Y. Online), Journal Name: Astronomical Journal (New York, N.Y. Online) Journal Issue: 6 Vol. 138; ISSN 1538-3881
• Country of Publication: United States
• Language: English

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