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Fluctuations in the diffuse X-ray background observed with Ginga

AuthorsButcher, J. A.; Stewart, G. C.; Warwick, R. S.; Fabian, A. C.; Carrera, Francisco J. ; Barcons, Xavier ; Hayashida, K.; Inoue, H.; Kii, T.
KeywordsGalaxies: active
X-rays: general
Diffuse radiation
Issue Date1997
PublisherRoyal Astronomical Society
Oxford University Press
CitationMonthly Notices of the Royal Astronomical Society 291(3): 437-445 (1997)
AbstractWe present Ginga measurements of the spatial fluctuations in the diffuse X-ray background. When combined with earlier results, the new data constrain the extragalactic log M-log S relation in the 2-10 keV energy band to a form close to the Euclidean prediction over the flux range 10-10-5 × 10-13 erg cm-2 s-1. The normalization of the 2-10 keV source counts is a factor 2-3 above that derived in the softer 0.3-0.5 keV band from the Einstein Extended Medium Sensitivity Survey, if a spectral conversion is assumed which ignores X-ray absorption intrinsic to the sources. Both this result and the spectral characteristics of the spatial fluctuations are consistent with relatively low-luminosity active galaxies (i.e. Lx< 1044 erg s-1) dominating the 2-10 keV source counts at intermediate flux levels. We also use the 'excess variance' of the fluctuations to constrain possible clustering of the underlying discrete sources.
Publisher version (URL)https://doi.org/10.1093/mnras/291.3.437
Identifiersdoi: 10.1093/mnras/291.3.437
issn: 0035-8711
e-issn: 1365-2966
Appears in Collections:(IFCA) Artículos
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