Near-UV Merger Signatures in Early-Type Galaxies

(2) National Radio Astronomy Observatory Charlottesville; J. E. Hibbard (2) ((1) University of Virginia Charlottesville; Jodie R. Martin (1); Robert W. O'Connell (1); VA; VA)

arxiv: 0707.1793 · v1 · submitted 2007-07-12 · 🌌 astro-ph

Near-UV Merger Signatures in Early-Type Galaxies

Jodie R. Martin (1) , Robert W. O'Connell (1) , J. E. Hibbard (2) ((1) University of Virginia Charlottesville , VA , (2) National Radio Astronomy Observatory Charlottesville , VA) This is my paper

classification 🌌 astro-ph

keywords galaxiesearly-typecompositeimagingnear-uvpopulationpopulationssignatures

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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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Near-UV Merger Signatures in Early-Type Galaxies

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