Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16..111c&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 3, p. 111-114
Astronomy and Astrophysics
Astronomy
1
Active Galactic Nuclei, Astronomical Catalogs, Background Radiation, Cross Correlation, Signal Processing, X Ray Astronomy, Data Correlation, Energy Spectra, Ginga Satellite, Goodness Of Fit, Statistical Analysis, X Ray Sources
Scientific paper
Catalogs of several types of extragalactic objectes have been cross-correlated with Ginga measurements of the X-ray background intensity. Some of these catalogs give rise to significant signals, meaning that either sources in them or some other sources clustered around them produce a fraction of the X-ray background. The significance of these results has been established using bootstrap and X-ray background simulations. An expression to infer the local X-ray emissivity from the cross-correlation signal is given and applied to two galaxy catalogs (UGC and IRAS) for which the signal is more significant (greater than 95 per cent). Values of approximately 1039 h erg/s/cu Mpc are obtained, implying that is less than or equal to 30 per cent of the X-ray background could be produced by a non-evolving population of galaxies.
Barcons Xavier
Butcher Jackie A.
Carrera Francicso J.
Fabian Andrea C.
Lahav Ofer
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