Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-08-12
Mon.Not.Roy.Astron.Soc.337:953,2002
Astronomy and Astrophysics
Astrophysics
16 pages, 10 figures, accepted for publication in MNRAS. Previous submission contained mn.sty - now removed
Scientific paper
10.1046/j.1365-8711.2002.05970.x
We present a combined photometric and spectroscopic analysis of the star formation history and space density of a sample of 485 luminous, M_V - 5 log h < -20.5, field early-type galaxies at redshifts 0.3 < z < 0.6. The observed b_Jori colours as a function of redshift, mean absorption line strengths and [OII] 3727 emission properties are used to constrain the star formation history of the galaxies. The mean star formation history of the early-type galaxy sample is consistent with an old (z_f>1), passively evolving luminosity-weighted stellar population. Twenty-one percent of the sample possess detectable [OII] 3727 emission consistent with a low level (<1 M_solar/yr) of on-going star formation. Parametric and non-parametric estimates of the space density of the sample are derived. The integrated luminosity density at z ~ 0.4, allowing only for passive luminosity evolution, is in excellent agreement with the local, (
Hewett Paul C.
Lewis Geraint F.
Warren Stephen J.
Willis Jon P.
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