UV properties of early-type galaxies in the Virgo Cluster

We study the UV properties of a volume-limited sample of early-type galaxies in the Virgo Cluster combining new GALEX far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) data with spectrophotometric data available at other wavelengths. The sample includes 264 elliptical, lenticular, and dwarf gal...

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Detalles Bibliográficos
Autores: Boselli, A., Cortese, L., Deharveng, J. M., Gavazzi, G., Yi, K. S., Gil De Paz, Armando, Seibert, M., Boissier, S., Donas, J., Lee, Y. W., Madore, B. F., Martin, D. C., Rich, R. M., Sohn, Y. J.
Tipo de recurso: artículo
Fecha de publicación:2005
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/51776
Acceso en línea:https://hdl.handle.net/20.500.14352/51776
Access Level:acceso abierto
Palabra clave:52
Band surface photometry
Dwarf elliptic galaxies
Tully-fisher relation
Star-formation
S0 galaxies
Stellar populations
Evolution-explorer
Sample
Histories
Catalog
Astrofísica
Astronomía (Física)
Descripción
Sumario:We study the UV properties of a volume-limited sample of early-type galaxies in the Virgo Cluster combining new GALEX far-ultraviolet (1530 Å) and near-ultraviolet (2310 Å) data with spectrophotometric data available at other wavelengths. The sample includes 264 elliptical, lenticular, and dwarf galaxies spanning a large range in luminosity (M_B ≤ -15). While the NUV to optical or near-IR color-magnitude relations (CMRs) are similar to those observed at optical wavelengths, with a monotonic reddening of the color index with increasing luminosity, the (FUV - V) and (FUV - H) CMRs show a discontinuity between massive and dwarf objects. An even more pronounced dichotomy is observed in the (FUV - NUV) CMR. For elliptical galaxies, the (FUV - NUV) color becomes bluer with increasing luminosity and with increasing reddening of the optical or near-IR color indices. For the dwarfs, the opposite trend is observed. These observational evidences are consistent with the idea that the UV emission is dominated by hot, evolved stars in giant systems, while in dwarf ellipticals residual star formation activity is more common.

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