Small-scale fluctuations of the X-ray background

Details Small-scale fluctuations of the X-ray background Small-scale fluctuations of the X-ray background

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..241s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 15, 1991, p. 241-252.

Astronomy and Astrophysics

Astronomy

23

Background Radiation, Diffuse Radiation, X Ray Sources, Angular Distribution, Fluctuation Theory, Instrument Errors

Scientific paper

Fluctuations of the diffuse X-ray background are investigated using the Einstein Observatory Deep Survey data. Small angular-scale variations of the numbers of counts in the energy range 0.8-3.5 keV in the central 32 x 32 sq arcmin of the IPC are analyzed by means of the two-point correlation function. It is shown that detector modulation contributes substantially to the observed fluctuations. Instrumental effects are estimated and subtracted from the raw observations. The residual fluctuations are used to estimate the log N-log S relation of the X-ray sources below the Einstein sensitivity limit. Taking into account numerous uncertainties involved in this analysis, it is shown that the amplitude of fluctuations observed in the Deep Survey data is consistent with a relatively small number of sources producing the X-ray background.

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