Near-UV Merger Signatures in Early-Type Galaxies
| Autor: | Martin, Jodie R., O'Connell, Robert W., Hibbard, J. E. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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. Comment: 6 pages, 2 figures. To appear in ``New Quests in Stellar Astrophysics II, Ultraviolet Properties of Evolved Stellar Populations'', Eds M. Chavez, E. Bertone, D. Rosa-Gonzalez and L. H. Rodriguez-Merino, Springer-Verlag |
| Databáze: | arXiv |
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