Luminosity Functions of Elliptical Galaxies at z < 1.2

Details Luminosity Functions of Elliptical Galaxies at z < 1.2 Luminosity Functions of Elliptical Galaxies at z < 1.2

1996-02-08

arxiv.org/abs/astro-ph/9602041v1

Astronomy and Astrophysics

Astrophysics

To be published in ApJ Letters, 4 pages, AAS Latex, 4 figures, and 2 tables

Scientific paper

10.1086/310018

The luminosity functions of E/S0 galaxies are constructed in 3 different redshift bins (0.2 < z < 0.55, 0.55 < z < 0.8, 0.8 < z < 1.2), using the data from the Hubble Space Telescope Medium Deep Survey (HST MDS) and other HST surveys. These independent luminosity functions show the brightening in the luminosity of E/S0s by about 0.5~1.0 magnitude at z~1, and no sign of significant number evolution. This is the first direct measurement of the luminosity evolution of E/S0 galaxies, and our results support the hypothesis of a high redshift of formation (z > 1) for elliptical galaxies, together with weak evolution of the major merger rate at z < 1.

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