A Large-Area Cross-Correlation Study of High Galactic Latutude Soft and Hard X-ray Skies
| dc.creator | Miyaji, Takamitsu | |
| dc.creator | Hasinger, Guenther | |
| dc.creator | Egger, Roland | |
| dc.creator | Truemper, Joachim | |
| dc.creator | Freyberg, Michael J. | |
| dc.date | 1996-01-30 | |
| dc.date.accessioned | 2026-07-07T02:20:50Z | |
| dc.date.available | 2026-07-07T02:20:50Z | |
| dc.description | We have made cross-correlation analyses of (2 -- 15 keV) HEAO A2 and 1 keV ROSAT PSPC All-Sky Survey maps over a selected area ($\sim$ 4000 deg$^2$) with high galactic latitude (b>40 deg). We have calculated the correlations for the bright ROSAT sources and residual background separately with the \HEAO A2 TOT (2 -- 10 keV) and HRD (5 -- 15 keV) maps. The amplitude of the bright \ROSAT source -- A2 CCFs are 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 are 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 1 keV auto-correlation function (ACF) found by Soltan et al. (1995) for the same ROSAT data. Their significant angular CCF at a scale of < 5 deg is of an unknown origin and it could represent a new class of cosmic X-ray sources. If this 1 keV ACF has a hot plasma spectrum with kT\sim 2 keV, 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\sim 2.5 deg. On the other hand, if this component has a lower temperature or a steeper spectrum, a major modification to the population synthesis model and/or an introduction of new classes would be needed. | |
| dc.description | Accepted to A&A, 11 pages, a LaTeX text, 4 postscript figures, and l-aa.sty are tar'd, gzip'ed and uuencoded | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9601173 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9601173 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/10345 | |
| dc.subject | Astrophysics | |
| dc.title | A Large-Area Cross-Correlation Study of High Galactic Latutude Soft and Hard X-ray Skies | |
| dc.type | text |