Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..545g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, April 15, 1992, p. 545-556.
Astronomy and Astrophysics
Astrophysics
14
Active Galactic Nuclei, Extraterrestrial Radiation, Star Formation, X Ray Astronomy, X Ray Sources, Astronomical Spectroscopy, Cooling Flows (Astrophysics), Cosmic Background Explorer Satellite, Elliptical Galaxies, Galactic Clusters, Radiant Flux Density, Red Shift
Scientific paper
The nature of discrete sources contributing to the extragalactic 'X-ray background' (XRB) in the energy range about 0.1-3 keV has been investigated via optical identifications based on positional coincidence and spectroscopy. The results presented address the counterparts to the discrete X-ray sources detected in the Einstein Observatory deep X-ray survey in Pavo. X-ray selected quasars, detected to a limiting flux of about 10 exp -14 erg/sq cm/s and a limiting B(J) magnitude of 21.5, have a surface density of about 32 percent/sq deg, an average redshift of 0.94, and account directly for about 15 percent of the extragalactic X-ray background at an effective energy of 2 keV. Other discrete-source detections in the Pavo survey have included the discovery of the first examples of star-forming galaxies at moderate redshift, of the kind which may contribute substantially to the XRB in the energy range about 3-20 keV. One further object is an elliptical (cD) galaxy in a cluster with X-ray emission possibly arising from a cooling flow.
Brissenden Roger J. V.
Griffiths Richard E.
Tuohy Ian R.
Ward Martin J.
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