SIMBAD references

2003ApJ...584L..69B - Astrophys. J., 584, L69-L72 (2003/February-3)

Far-ultraviolet emission from elliptical galaxies at z = 0.33.

BROWN T.M., FERGUSON H.C., SMITH E., BOWERS C.W., KIMBLE R.A., RENZINI A. and RICH R.M.

Abstract (from CDS):

We present far-UV images of the rich galaxy cluster ZwCl 1358.1+6245, taken with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope (HST). When combined with archival HST observations, our data provide a measurement of the UV-to-optical flux ratio in eight early-type galaxies at z=0.33. Because the UV flux originates in a population of evolved, hot, horizontal-branch (HB) stars, this ratio is potentially one of the most sensitive tracers of age in old populations–it is expected to fade rapidly with look-back time. We find that the UV emission in these galaxies, at a look-back time of 3.9 Gyr, is significantly weaker than it is in the current epoch, yet it is similar to that in galaxies at a look-back time of 5.6 Gyr. Taken at face value, these measurements imply different formation epochs for the massive elliptical galaxies in these clusters, but an alternative explanation is a ``floor'' in the UV emission due to a dispersion in the parameters that govern HB morphology.

Abstract Copyright:

Journal keyword(s): Galaxies: Cooling Flows - Galaxies: Evolution - Galaxies: Stellar Content - Ultraviolet: Galaxies

Status at CDS:  

CDS comments: Fig.1 and t.1 : Galaxies are [FFF98] NNN

Simbad objects: 17

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2020.04.02-19:08:43

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