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

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.

10 pages, 7 figures, 2 tables - Published in AJ; v2 Minor revision to match published version

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• Star Formation in Collision Debris: Insights from the modeling of their Spectral Energy Distribution
• The frequency and properties of young tidal dwarf galaxies in nearby gas-rich groups
• The Influence of Ram Pressure on the Evolution of Tidal Dwarf Galaxies
• Pre-existing dwarfs, tidal knots and a tidal dwarf galaxy: an unbiased HI study of the gas-rich interacting galaxy group NGC 3166/9
• An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877
• Ground-based Pa$\alpha$ Narrow-band Imaging of Local Luminous Infrared Galaxies I: Star Formation Rates and Surface Densities
• Recent galaxy mergers and residual star formation of red sequence galaxies in galaxy clusters
• Extranuclear Halpha-emitting complexes in low-z (U)LIRGs: Precursors of tidal dwarf galaxies?
• NGC 4102: High Resolution Infrared Observations of a Nuclear Starburst Ring
• UVIT view of NGC 5291: Ongoing star formation in tidal dwarf galaxies at ~ 0.35 kpc resolution
• Measurable Relationship Between Bright Galaxies and Their Faint Companions in WHL J085910.0+294957, a Galaxy Cluster at z = 0.30: Vestiges of Infallen Groups?
• Formation of dwarf ellipticals and dwarf irregular galaxies by interaction of giant galaxies under environmental influence