UV properties of early-type galaxies in the virgo cluster

A. Boselli, L. Cortese, J. M. Deharveng, G. Gavazzi, K. S. Yi, A. Gll De Paz, M. Seibert, S. Boissier, J. Donas, Y. W. Lee, B. F. Madore, D. C. Martin, R. M. Rich, Y. J. Sohn

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


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 (MB ≤ -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.

Original languageEnglish
Pages (from-to)L29-L32
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2005 Aug 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'UV properties of early-type galaxies in the virgo cluster'. Together they form a unique fingerprint.

Cite this