The Luminosity Function of Early-Type Galaxies at z~0.75

Details The Luminosity Function of Early-Type Galaxies at z~0.75 The Luminosity Function of Early-Type Galaxies at z~0.75

2004-07-30

arxiv.org/abs/astro-ph/0407644v1

Astronomy and Astrophysics

Astrophysics

39 pages, 21 figures, accepted in AJ

Scientific paper

10.1086/424857

We measure the luminosity function of morphologically selected E/S0 galaxies from $z=0.5$ to $z=1.0$ using deep high resolution Advanced Camera for Surveys imaging data. Our analysis covers an area of $48\Box\arcmin$ (8$\times$ the area of the HDF-N) and extends 2 magnitudes deeper ($I\sim24$ mag) than was possible in the Deep Groth Strip Survey (DGSS). At $0.51.7$, E/S0 galaxies at brighter luminosities ($M_B<-20.1$), but are increasingly different at fainter magnitudes where `blue' galaxies are both smaller and have lower Sersic parameters. Fits of the colors to stellar population models suggest that most E/S0 galaxies have short star-formation time scales ($\tau<1$ Gyr), and that galaxies have formed at an increasing rate from $z\sim8$ until $z\sim2$ after which there has been a gradual decline.

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