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Title: | Fluctuations in the diffuse X-ray background observed with Ginga |
Authors: | Butcher, J. A.; Stewart, G. C.; Warwick, R. S.; Fabian, A. C.; Carrera, Francisco J. ![]() ![]() |
Keywords: | Galaxies: active X-rays: general Diffuse radiation |
Issue Date: | 1997 |
Publisher: | Royal Astronomical Society Oxford University Press |
Citation: | Monthly Notices of the Royal Astronomical Society 291(3): 437-445 (1997) |
Abstract: | We 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 |
URI: | http://hdl.handle.net/10261/169768 |
DOI: | 10.1093/mnras/291.3.437 |
Identifiers: | doi: 10.1093/mnras/291.3.437 issn: 0035-8711 e-issn: 1365-2966 |
Appears in Collections: | (IFCA) Artículos |
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