The Photometric Redshift Distribution and Evolutionary Properties of Galaxies up to z= 4.5 in the Field of the Quasar BR1202-0725

Details The Photometric Redshift Distribution and Evolutionary Properties of Galaxies up to z= 4.5 in the Field of the Quasar BR1202-0725 The Photometric Redshift Distribution and Evolutionary Properties of Galaxies up to z= 4.5 in the Field of the Quasar BR1202-0725

1998-02-26

arxiv.org/abs/astro-ph/9802340v1

Astronomy and Astrophysics

Astrophysics

14 pages, 3 tables, 11 figures, Astronomical Journal in press

Scientific paper

10.1086/300361

We present a deep BVrIK multicolor catalog of galaxies in the field of the high redshift (z=4.7) quasar BR 1202-0725. Reliable colors have been measured for galaxies selected down to R=25. The choice of the optical filters has been optimized to define a robust multicolor selection of galaxies at 3.81.5. At variance with brighter surveys (I<22.5) there is a tail in the distribution towards high redshifts up to z~4. The luminosity function at z~0.6 shows a steepening for M_B>-19. The observed cosmological ultraviolet luminosity density is computed in the overall redshift interval z=0.3-4.5 reaching a value 2x10^{19} W/Hz/Mpc^3 at z~0.8. We have derived in a homogeneous way, using the GISSEL libraries, the physical parameters connected with the fitted spectral energy distributions. The bulk of the blue intermediate redshift population with z=0.4-1 mostly consists of very young star-forming galaxies with a median starburst age of the order of a few 10^8 yr and typical mass in luminous stars ~2x10^8 Mo.

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