A significant contribution to the cosmic X-ray background from sources associated with nearby galaxies

A revised limit on the local X-ray emissivity due to sources correlated with nearby galaxies is obtained. These results are extrapolated up to a redshift of about 5, and it is found that a smaller, but still significant, fraction of the X-ray background (30 +/- 15 percent) can be accounted for by th...

Full description

Saved in:
Bibliographic Details
Published in:Nature (London) 1993-08, Vol.364 (6439), p.693-695
Main Authors: Lahav, O., Fabian, A. C., Barcons, X., Boldt, E., Butcher, J., Carrera, F. J., Jahoda, K., Miyaji, T., Stewart, G. C., Warwick, R. S.
Format: Article
Language:English
Subjects:
Astronomy
Background radiations
Earth, ocean, space
Emissions
Exact sciences and technology
Humanities and Social Sciences
letter
multidisciplinary
Science
Science (multidisciplinary)
Space Radiation
Stars & galaxies
Stellar systems. Galactic and extragalactic objects and systems. The universe
Unidentified sources and radiation outside the solar system
X-rays
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A revised limit on the local X-ray emissivity due to sources correlated with nearby galaxies is obtained. These results are extrapolated up to a redshift of about 5, and it is found that a smaller, but still significant, fraction of the X-ray background (30 +/- 15 percent) can be accounted for by these sources. Evolution of the source properties and/or a new population of sources at high redshift is required to explain the residual background emissions.
ISSN:0028-0836
1476-4687
DOI:10.1038/364693a0