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Title:
Tidal Dwarf Galaxies Around a Post-merger Galaxy, NGC 4922
Authors:
Sheen, Yun-Kyeong; Jeong, Hyunjin; Yi, Sukyoung K.; Ferreras, Ignacio; Lotz, Jennifer M.; Olsen, Knut A. G.; Dickinson, Mark; Barnes, Sydney; Park, Jang-Hyun; Ree, Chang H.; Madore, Barry F.; Barlow, Tom A.; Conrow, Tim; Foster, Karl; Friendman, Peter G.; Lee, Young-Wook; Martin, D. Christopher; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Seibert, Mark; Small, Todd; Wyder, Ted K.
Affiliation:
AA(Department of Astronomy, Yonsei University, Seoul 120-749, Republic of Korea ), AB(Department of Astronomy, Yonsei University, Seoul 120-749, Republic of Korea ), AC(), AD(Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, RH5 6NT, UK ), AE(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA ), AF(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA ), AG(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719, USA ), AH(Lowell Observatory, Flagstaff, AZ 86001, USA ), AI(Korea Astronomy and Space Science Institute, Hwaam 61-1, Yuseong, Daejeon 305-348, Republic of Korea ), AJ(Korea Astronomy and Space Science Institute, Hwaam 61-1, Yuseong, Daejeon 305-348, Republic of Korea ), AK(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101, USA ), AL(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AM(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AN(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AO(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AP(Department of Astronomy, Yonsei University, Seoul 120-749, Republic of Korea ), AQ(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AR(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AS(Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), AT(Department of Astronomy, Columbia University, New York, NY 10027, USA), AU(Observatories of the Carnegie Institution of Washington, 813 Santa Barbara St., Pasadena, CA 91101, USA ), AV(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA ), AW(California Institute of Technology, MC 405-47, 1200 E. California Blvd., Pasadena, CA 91125, USA )
Publication:
The Astronomical Journal, Volume 138, Issue 6, pp. 1911-1916 (2009). (AJ Homepage)
Publication Date:
12/2009
Origin:
IOP
AJ Keywords:
galaxies: dwarf, galaxies: individual: NGC 4922, galaxies: interactions, galaxies: starburst, ultraviolet: galaxies
DOI:
10.1088/0004-6256/138/6/1911
Bibliographic Code:
2009AJ....138.1911S

Abstract

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 ~106–7 M sun, typical for dwarf galaxies.
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