|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
ASCA observations of Deep ROSAT fields - II. The 2-10keV AGN luminosity function | | B.J.Boyle
; I.Georgantopoulos
; A.J.Blair
; G.C.Stewart
; R.E.Griffiths
; T.Shanks
; K.F.Gunn
; O.Almaini
; | | Date: |
1 Oct 1997 | | Subject: | astro-ph | | Affiliation: | AAO), I.Georgantopoulos (Athens), A.J.Blair (Leicester), G.C.Stewart (Leicester), R.E.Griffiths (Carnegie-Mellon), T.Shanks (Durham), K.F.Gunn (Durham), O.Almaini (IoA | | Abstract: | We present additional optical spectroscopic identifications of sources identified in three deep ASCA GIS fields which also form part of a deep ROSAT survey. In total, 26 ASCA sources have been detected down to a 2-10keV flux limit of S = 5e-14 erg/cm/s. LDSS observations have increased the spectroscopic completeness of the survey to between 65 and 85 per cent, with identifications for up to 13 QSOs with broad emission lines and 6 objects with narrow emission lines. Combining these objects with the AGN identified in the LMA/HEAO-1 sample by Grossan, we find evidence for significant cosmological evolution in the 2-10keV band (=0.63+/-0.03), fit by a pure luminosity evolution model; L propto (1+z)^k, k=2.04^{+0.16}_{-0.22}$. The present-epoch 2-10keV AGN X-ray luminosity function, Phi(L_X), is best represented by a two power law function: Phi(L_X) propto L^{-3.0}, L*>10^{44.1}erg/s; $Phi (L_X) propto L^{-1.9}$, L*<10^{44.1}erg/s. Depending on the extent to which we extrapolate the z=0 AGN luminosity function, we predict a total contribution to the 2-10keV X-ray background from QSOs and narrow-emission-line galaxies which ranges from 48 per cent (for AGN with L>10^{42}erg/s) to 80 per cent (L>10^{39}erg/s). | | Source: | arXiv, astro-ph/9710002 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER