Results on the X-ray background and sources from the ROSAT medium sensitivity survey.
Abstract
A total of 184 sources with X-ray fluxes between 10 to the -14th and 2 x 10 to the -13th cgs were discovered in ROSAT PSPC pointings covering 2.6 sq deg. The differential N(S) relation flattens significantly below 2 x 10 to the -14th cgs. In the 1 - 2 keV band the fraction of flux in resolved sources is 20 - 30 percent. The spectrum of the resolved sources is similar to that of the remaining background in the 1 - 2 keV range, both with a power law slope of -1.3. In the deepest pointing, centered on the North-ecliptic Pole, evidence is found of structure in the background on a scale of about 20 arcmin. This may represent a glimpse of the structure of the universe at redshifts of about 1.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1991
- Bibcode:
- 1991A&A...246L...2H
- Keywords:
-
- Background Radiation;
- Cosmic X Rays;
- Diffuse Radiation;
- Radiant Flux Density;
- X Ray Sources;
- Interstellar Extinction;
- Proportional Counters;
- Rosat Mission;
- X Ray Spectra;
- Astrophysics