Near-UV Merger Signatures in Early-Type Galaxies

Details Near-UV Merger Signatures in Early-Type Galaxies Near-UV Merger Signatures in Early-Type Galaxies

2007-07-12

arxiv.org/abs/0707.1793v1

Astronomy and Astrophysics

Astrophysics

6 pages, 2 figures. To appear in ``New Quests in Stellar Astrophysics II, Ultraviolet Properties of Evolved Stellar Population

Scientific paper

Hierarchical assembly of early-type galaxies (Es and S0s) over an extended period of time will result in mixed-generation stellar populations. Here we look for signatures of composite populations in broad-band, near-ultraviolet (2500-3400 A), high-resolution HST imaging of the cores of 12 bright early-type galaxies without obvious dust or active galactic nuclei. Near-UV imaging is a sensitive probe for the detection of younger components with ages in the range of 10 Myr to 5 Gyr. Only two galaxies have central colors (r < 0.75 r_eff) that are consistent with a single-generation population. The other ten require a composite population.

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