Statistics – Computation
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..619g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 3, p. 619-626.
Statistics
Computation
30
Active Galactic Nuclei, Isotropism, Rosat Mission, X Ray Astronomy, Angular Correlation, Background Radiation, Computational Astrophysics, Quasars
Scientific paper
The isotropy of the 1-2 keV X-ray background is investigated with ROSAT in order to constrain the models for its origin. The photon count distribution is not well fitted by the source count distribution predicted using models for the luminosity function and evolution determined from identified AGN. This suggests either a steeper-than-expected slope for the low-luminosity branch of the AGN luminosity function or the presence of a population of sources other than QSOs and Seyfert 1 galaxies. The autocorrelation function of the background fluctuations shows a significant (3 sigma) signal at small angular scales (less than 3 arcmin). The upper limit on this signal suggests that QSOs and Seyfert 1 galaxies can produce up to about 50 percent of the residual background.
Boyle Brian J.
Georgantopoulos Ioannis
Griffiths Richard E.
Shanks Tom
Stewart Gordon C.
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