Small-scale fluctuations of the soft X-ray background

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

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...378..735s&link_type=abstract

Astronomy and Astrophysics, v.378, p.735-739 (2001)

Astronomy and Astrophysics

Astrophysics

12

X-Rays: General, Diffuse Radiation

Scientific paper

We report the detection of the X-ray background fluctuations at small angular scales. ROSAT PSPC archive pointed observations are used to measure the autocorrelation function (ACF) of the background at scales of 0fdg03 - 0fdg3 . The pointings have been selected from an area apparently free from galactic contamination and the ACF signal is generated mostly by the extragalactic component of the XRB. At separations below ~ 0fdg1 known X-ray clusters of galaxies become a substantial source of the background fluctuations. Assuming a power law, the ACF for all the data has a slope of ~ 1, but is substantially flatter (with slope of ~ 0.6) when pointings containing bright clusters are removed. Flattening of the ACF at small separations could indicate existence of a hot, nonuniformly distributed gas accumulating in wells of gravitational potential. At separations 0fdg3 -0fdg4 where the ACF estimates based on the ROSAT pointings and All-Sky Survey are available, both data sets give consistent results.

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