Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ycat..73490135g&link_type=abstract
VizieR On-line Data Catalog: J/MNRAS/349/135. Originally published in: 2004MNRAS.349..135G
Physics
Surveys, X-Ray Sources, Cross Identifications
Scientific paper
In this paper we investigate the properties of low X-ray-to-optical flux ratio sources detected in a wide-area (2.5{deg}2) shallow [fX(0.5-8keV)~10-14erg/s/cm2] XMM-Newton survey. We find a total of 26 sources (5 per cent of the total X-ray-selected population) with log(fX)/f(opt)<-0.9 to the above flux limit. Optical spectroscopy is available for 20 of these low X-ray-to-optical flux ratio objects.
(1 data file).
Basilakos Spyros
Boyle Brian J.
Georgakakis Antonis
Georgantopoulos Ioannis
Kolokotronis Vaggelis
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