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Nearby galaxies and the GINGA X-ray background

AuthorsCarrera, Francisco J. ; Barcons, Xavier ; Butcher, J. A.; Fabian, A. C.; Lahav, O.; Stewart, G. C.; Warwick, R. S.
KeywordsDiffuse radiation
Infrared: galaxies
X-rays: galaxies
X-rays: general
Galaxies: general
Issue Date1995
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 275(1): 22-30 (1995)
AbstractWe present here the results of cross-correlating the X-ray background measured by Ginga in the 2–10 keV band with several catalogues of extragalactic objects. Positive signals with an amplitude of a few per cent have been found for some catalogues implying that some fraction of the X-ray background is produced either by the class of catalogued sources or by other classes spatially related to them. Detailed X-ray background simulations have been used to assess the significance of the results and, for the first time, the full angular shape of the cross-correlation. The inferred X-ray volume emissivity in the local Universe, j0, has been estimated for two galaxy catalogues (UGC and IRAS) for which the cross-correlation is highly significant. We obtain j0 = (0.74 ± 0.07) for UGC and j0 = (1.15 ± 0.10) for IRAS, in units of 1039h erg s–1 Mpc–3. Extrapolating this result back to z ~ 1 –4 leads to the conclusion that ≲ 10–30 per cent of the X-ray background could be produced by a non-evolving population of galaxies. These values are shown to be consistent with upper limits on the Auto Correlation Function derived here.
Publisher version (URL)https://doi.org/10.1093/mnras/275.1.22
Identifiersissn: 0035-8711
e-issn: 1365-2966
Appears in Collections:(IFCA) Artículos
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