2005A&A...441..417H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST19:58:41

2005A&A...441..417H - Astronomy and Astrophysics, volume 441, 417-434 (2005/10-2)

Luminosity-dependent evolution of soft X-ray selected AGN. New Chandra and XMM-Newton surveys.

HASINGER G., MIYAJI T. and SCHMIDT M.

Abstract (from CDS):

We present new results on the cosmological evolution of unabsorbed (type-1) active galactic nuclei (AGN) selected in the soft (0.5-2keV) X-ray band. From a variety of ROSAT, XMM-Newton and Chandra surveys we selected a total of ∼1000 AGN with an unprecedented spectroscopic and photometric optical/NIR identification completeness. For the first time we are able to derive reliable space densities for low-luminosity (Seyfert-type) X-ray sources at cosmological redshifts. The evolutionary behaviour of AGN shows a strong dependence on X-ray luminosity: while the space density of high-luminosity AGN reaches a peak around z∼2, similar to that of optically selected QSO, the space density of low-luminosity AGNs peaks at redshifts below z=1. This confirms previous ROSAT findings of a luminosity-dependent density evolution. Using a rigorous treatment of the optical identification completeness we are able to show that the space density of AGN with X-ray luminosities Lx<1045erg/s declines significantly towards high redshifts.

Abstract Copyright:

Journal keyword(s): galaxies: active - X-rays: general

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1811 1
3 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 748 0
4 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5824 0
5 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 610 0
6 NAME NEP reg 18 00 00.000 +66 33 38.55           ~ 255 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-19:58:41

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