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Date and Time of the Query: 2019-08-19 T20:48:26 PDT
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For refcode 1995MNRAS.272..462B:
Retrieve 37 NED objects in this reference.
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NED Abstract

Copyright by Royal Astronomical Society. 1995MNRAS.272..462B The Cambridge-Cambridge ROSAT Serendipity Survey - I. X-ray luminous galaxies B.J. Boyle, R. G. McMahon, B.J. Wilkes and M. Elvis Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge C113 0HA Present address: Royal Greenwich Observatory, Madingley Road, Cambridge CB3 0EZ Center for Astrophysics, 60 Garden St, Cambridge, MA 21260, USA Accepted 1994 September 20. Received 1994 September 19; in original form 1994 February 2 ABSTRACT We report on the first results obtained from a new optical identification programme of 123 faint X-ray sources with S(0.5-2 keV) > 2 x 10^-14^ erg s^-1^ cm^-2^ serendipitously detected in ROSAT PSPC pointed observations. We have spectroscopically identified the optical counterparts to more than 100 sources in this survey. Although the majority of the sample (68 objects) are QSOs, we have also identified 12 narrow emission line galaxies which have extreme X-ray luminosities (10^42^ <L_x_ < 10^43.5^ erg s^-1^). Subsequent spectroscopy reveals them to be a mixture of starburst galaxies and Seyfert 2 galaxies in approximately equal numbers. Combined with potentially similar objects identified in the Einstein Extended Medium Sensitivity Survey, these X-ray-luminous galaxies exhibit a rate of cosmological evolution, L_x_ is proportional to (1 t z)^2.5+/-1.0, consistent with that derived for X-ray QSOs. This evolution, coupled with the steep slope determined for the faint end of the X-ray luminosity function {phi}(L_x_) is proportional to L_x_^-1.9^19), implies that such objects could comprise 15-35 per cent of the soft (1-2 keV) X-ray background. Key words: galaxies: active - quasars: general - galaxies: Seyfert - galaxies: starburst - X-rays: galaxies.
Retrieve 37 NED objects in this reference.
Please click here for ADS abstract

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