Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-10-24
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS. 7 pages including 5 figures; uuencoded compressed postscript; RGO-210
Scientific paper
We report on the first results obtained from a new optical identification programme of 123 faint X-ray sources with $S$(0.5--2$\,{\rm keV)}>2\times 10^{-14}\,$erg$\,$s$^{-1}\,$cm$^{-2}\,$ serendipitously detected in {\it 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 ($10^{42} < L_{\rm X} < 10^{43.5}\,$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 {\it Einstein} Extended Medium Sensitivity Survey, these X-ray-luminous galaxies exhibit a rate of cosmological evolution, $L_{\rm X} \propto (1+z)^{2.5\pm1.0}$, 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 ($\Phi(L_{\rm X}) \propto L_{\rm X}^{-1.9}$), implies that such objects could comprise 15--35 per cent of the soft (1--2$\,$keV)
Boyle Brian J.
Elvis Martin
McMahon Richard G.
Wilkes Belinda J.
No associations
LandOfFree
The Cambridge-Cambridge ROSAT Serendipity Survey - I. X-ray-luminous galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Cambridge-Cambridge ROSAT Serendipity Survey - I. X-ray-luminous galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Cambridge-Cambridge ROSAT Serendipity Survey - I. X-ray-luminous galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-700429