Large-Scale Structure of the Universe: Constraints from the X-Ray Background
Abstract
The HEAO-1 limits on the intensity fluctuations of the hard X-ray background are used to impose limits on the large-scale structure of the universe at large redshifts. We find that if the present-day structures are extrapolated backward maintaining an approximately constant physical separation between structures then either the universe is much less structured at z>0.5 or else the sources of the X-ray background do not follow the matter distribution. Alternatively, if the present-day structures are extrapolated backward maintaining an approximately constant comoving separation between structures, then the sources of the X-ray background may follow the matter clustering beyond z>0.5, In this case, for {OMEGA}_0_<1 the fluctuations due to clustering are less than the observed upper limit, but for {OMEGA}_0_=1 they produce fluctuations close to this upper limit.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1988
- DOI:
- 10.1086/166164
- Bibcode:
- 1988ApJ...327...25M
- Keywords:
-
- Astronomical Models;
- Cosmology;
- Galactic Clusters;
- Red Shift;
- X Ray Sources;
- Background Radiation;
- Computational Astrophysics;
- Fluctuation Theory;
- Heao 1;
- Universe;
- Astrophysics;
- COSMOLOGY;
- GALAXIES: CLUSTERING;
- X-RAYS: SOURCES