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.
Source :: Astron.J.138:1911-1916,2009
Publication Year :: 2009
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 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 (GALEX) ultraviolet data played a critical role in the parameter (age and mass) estimation. Our stellar mass estimates of the tidal dwarf galaxy candidates are ~ 10^{6-7} M_sun, typical for dwarf galaxies.<br />Comment: 10 pages, 7 figures, 2 tables - Published in AJ; v2 Minor revision to match published version