Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..846c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 266, p. 846
Astronomy and Astrophysics
Astronomy
15
Autocorrelation, Sky Surveys (Astronomy), Proportional Counters, Cosmic X Rays, Background Radiation, Diffuse Radiation, Curve Fitting, X Ray Astronomy, X Ray Spectra, Confidence Limits
Scientific paper
One field of deep exposure and six collinear fields of medium exposure observed with the ROSAT Position Sensitive Proportional Counter are used to investigate the spatial anisotropy and inhomogeneity of the soft X-ray sky. The weighted angular autocorrelation function and the rms fluctuation of the surface intensity of the X-ray sky in the energy band 0.4-2.4 keV from 1 arcmin to 5 deg are calculated. The weighted fitting of the observed autocorrelation function to a theoretical power-law model scaling as theta exp -0.8 yields a 2-sigma upper limit of 3.86 x 10 exp -3 over the scale of theta = 2-300 arcmin.
Barber C. R.
Branduardi-Raymont Graziella
Chen Lie-Wen
Fabian Andrea C.
Warwick Robert S.
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