ROSAT All-Sky Survey sources on Schmidt plates.
Abstract
The authors present results from an ongoing identification program of ROSAT All-Sky Survey (RASS) sources on objective prism plates. More than 30% of the surveyed sources so far (9949 on ca. 8000 deg2) are AGN candidates with B ≤ 18.5. AGN with typical X-ray to optical flux ratios can principally be recognized down to the RASS flux limit, but large fractions of AGN with higher log(fX/fB) values are missed on the plates due to their optical faintness. The RASS AGN surface density depends strongly on Galactic absorption and therefore Galactic latitude. This reflects the steep X-ray spectra found with ROSAT.
- Publication:
-
Roentgenstrahlung from the Universe
- Pub Date:
- February 1996
- Bibcode:
- 1996rftu.proc..647B
- Keywords:
-
- X-Ray Surveys;
- X-Ray Sources: Identifications;
- X-Ray Sources: Active Galactic Nuclei