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, Young-Wook Lee, B. F. Madore, D. C. Martin, R. M. Rich, Young-Jong Sohn

Research output: Contribution to journalArticle

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Abstract

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
JournalAstrophysical Journal
Volume629
Issue number1 II
DOIs
Publication statusPublished - 2005 Aug 10

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galaxies
color
luminosity
elliptical galaxies
wavelength
dichotomies
hot stars
dwarf galaxies
wavelengths
star formation
discontinuity
trends
index

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Boselli, A., Cortese, L., Deharveng, J. M., Gavazzi, G., Yi, K. S., De Paz, A. G., ... Sohn, Y-J. (2005). UV properties of early-type galaxies in the virgo cluster. Astrophysical Journal, 629(1 II). https://doi.org/10.1086/444534
Boselli, A. ; Cortese, L. ; Deharveng, J. M. ; Gavazzi, G. ; Yi, K. S. ; De Paz, A. Gll ; Seibert, M. ; Boissier, S. ; Donas, J. ; Lee, Young-Wook ; Madore, B. F. ; Martin, D. C. ; Rich, R. M. ; Sohn, Young-Jong. / UV properties of early-type galaxies in the virgo cluster. In: Astrophysical Journal. 2005 ; Vol. 629, No. 1 II.
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abstract = "We study the UV properties of a volume-limited sample of early-type galaxies in the Virgo Cluster combining new GALEX far-ultraviolet (1530 {\AA}) and near-ultraviolet (2310 {\AA}) 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.",
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Boselli, A, Cortese, L, Deharveng, JM, Gavazzi, G, Yi, KS, De Paz, AG, Seibert, M, Boissier, S, Donas, J, Lee, Y-W, Madore, BF, Martin, DC, Rich, RM & Sohn, Y-J 2005, 'UV properties of early-type galaxies in the virgo cluster', Astrophysical Journal, vol. 629, no. 1 II. https://doi.org/10.1086/444534

UV properties of early-type galaxies in the virgo cluster. / Boselli, A.; Cortese, L.; Deharveng, J. M.; Gavazzi, G.; Yi, K. S.; De Paz, A. Gll; Seibert, M.; Boissier, S.; Donas, J.; Lee, Young-Wook; Madore, B. F.; Martin, D. C.; Rich, R. M.; Sohn, Young-Jong.

In: Astrophysical Journal, Vol. 629, No. 1 II, 10.08.2005.

Research output: Contribution to journalArticle

TY - JOUR

T1 - UV properties of early-type galaxies in the virgo cluster

AU - Boselli, A.

AU - Cortese, L.

AU - Deharveng, J. M.

AU - Gavazzi, G.

AU - Yi, K. S.

AU - De Paz, A. Gll

AU - Seibert, M.

AU - Boissier, S.

AU - Donas, J.

AU - Lee, Young-Wook

AU - Madore, B. F.

AU - Martin, D. C.

AU - Rich, R. M.

AU - Sohn, Young-Jong

PY - 2005/8/10

Y1 - 2005/8/10

N2 - 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.

AB - 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.

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U2 - 10.1086/444534

DO - 10.1086/444534

M3 - Article

VL - 629

JO - Astrophysical Journal

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SN - 0004-637X

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Boselli A, Cortese L, Deharveng JM, Gavazzi G, Yi KS, De Paz AG et al. UV properties of early-type galaxies in the virgo cluster. Astrophysical Journal. 2005 Aug 10;629(1 II). https://doi.org/10.1086/444534