A large-area cross-correlation study of high galactic latitude soft and hard X-ray skies.

Details A large-area cross-correlation study of high galactic latitude soft and hard X-ray skies. A large-area cross-correlation study of high galactic latitude soft and hard X-ray skies.

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312....1m&link_type=abstract

Astronomy and Astrophysics, v.312, p.1-10

Astronomy and Astrophysics

Astrophysics

7

Galaxies: Active, Galaxies: Clusters: General, Cosmology: Diffuse Radiation, X-Rays: Galaxies, X-Rays: General

Scientific paper

We have made cross-correlation analyses of (2-15keV) HEAO-1 A2 and 1keV ROSAT PSPC All-Sky Survey maps over a selected area (~4000deg^2^) with high galactic latitude (b>40deg). We have calculated the correlations for the bright ROSAT sources and residual background separately with the HEAO-1 A2 TOT (2-10keV) and HRD (5-15keV) maps. In any case, the angular dependence of the cross-correlation function (CCF) was consistent with expected from the HEAO-1 A2 collimator response function and the smoothing function of the ROSAT 1keV map. The amplitude of the bright ROSAT source - A2 CCFs is consistent with expectations from model populations of AGNs and clusters of galaxies, which emit in both bands. However, the residual ROSAT background - A2 CCFs amplitude at zero degree is about a factor of three larger than that expected from the model populations. Our soft-hard zero-lag and angular CCF results have been compared with the 1keV auto-correlation function (ACF) found by Soltan et al. (1995) for the same ROSAT data. Their significant angular CCF at a scale of θ<~5deg is of an unknown origin and it could represent a new class of cosmic X-ray sources. If this 1keV ACF has a hot plasma spectrum with kT~2keV, contribution of this component is consistent with both our zero-lag CCF in excess of the population synthesis model prediction and the upper-limit to the angular CCF at θ~2.5deg. On the other hand, if this component has a lower temperature or steeper spectrum, a major modification to the population synthesis model and/or an introduction of new classes would be needed.

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