[ITAL]Hubble Space Telescope[/ITAL] Imaging of the CFRS and LDSS Redshift Surveys. III. Field Elliptical Galaxies at [FORMULA][F]0.2<z<1.0[/F][/FORMULA]
1999; IOP Publishing; Volume: 525; Issue: 1 Linguagem: Inglês
10.1086/307885
ISSN1538-4357
AutoresD. Schade, S. J. Lilly, D. Crampton, Richard S. Ellis, O. Le Fèvre, F. Hammer, J. Brinchmann, Roberto Abraham, Matthew Colless, Karl Glazebrook, L. Tresse, Tom Broadhurst,
Tópico(s)Gamma-ray bursts and supernovae
ResumoTwo-dimensional surface photometry has been performed on a magnitude-limited sample of 46 field galaxies that are classified as ellipticals based on two-dimensional fitting of their luminosity profiles using Hubble Space Telescope imaging.These galaxies are described well by a deVaucouleurs R 1/4 profile.The sample was selected from the combined Canada-France and LDSS redshift surveys and spans the redshift range 0.20< z 15 angstroms indicating ongoing star formation.Therefore, field elliptical galaxies are not composed entirely of very old stellar populations.Estimated star-formation rates together with stellar population evolutionary models imply that ≤ 5% of the stellar mass in the elliptical galaxy population has been formed since z = 1.We find some evidence that the dispersion in color among field ellipticals at z ∼ 0.55 may be larger than that seen among samples of cluster ellipticals and S0 galaxies at similar redshift.We see no evidence for a decline in the space density of early-type galaxies with look-back time.The < V /V max > statistics and a comparison with local luminosity functions are both consistent with the view that the population of massive early-type galaxies was largely
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