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CROSS-CORRELATION OF THE X-RAY-BACKGROUND WITH NEARBY GALAXIES

JAHODA, K; LAHAV, O; MUSHOTZKY, RF; BOLDT, E; (1991) CROSS-CORRELATION OF THE X-RAY-BACKGROUND WITH NEARBY GALAXIES. ASTROPHYS J , 378 (2) L37 - L40.

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Abstract

We have cross-correlated the diffuse 2-10 keV X-ray surface brightness (using the HEAO 1 A-2 data) with the galaxy surface density from the diameter-limited UGC and the ESO catalog. Although the galaxies are nearby (z < 0.03) and sample only a small fraction of the volume believed to produce the X-ray background, we present a statistically significant correlation. The "zero-lag" (for 17 square degree cells) cross-correlation and associated 1-sigma interval is W triple-overdot xg = (3 +/- 1) x 10(-3). We estimate the volume X-ray emissivity of the local universe, rho-x = (2.8 +/- 1.0) x 10(38) ergs s-1 Mpc-3, which implies that unevolved populations of X-ray sources correlated with present-epoch galaxies can contribute only 13% +/- 5% of the cosmic X-ray background.

Type:Article
Title:CROSS-CORRELATION OF THE X-RAY-BACKGROUND WITH NEARBY GALAXIES
Keywords:COSMOLOGY, GALAXIES, CLUSTERING, X-RAYS, SOURCES, LOCAL GROUP, SPECTRUM, SAMPLE, MOTION
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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