Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-09-09
Astronomy and Astrophysics
Astrophysics
25 pages, with 8 figures included. Submitted to ApJ. sboughn@haverford.edu
Scientific paper
10.1086/305674
We present cross-correlation analyses of the HEAO 2-10 keV diffuse X-ray map with both the combined GB6/Parkes-MIT-NRAO (GB6-PMN) 5 GHz and the FIRST 1.4 GHz radio surveys. The cross-correlation functions (CCFs) of both radio surveys with the unresolved X-ray background were detected at the 5 sigma level. While the large angular resolution (3 degrees) of the X-ray map makes it difficult to separate the contributions of clustering from those of Poisson fluctuations, the amplitude of the CCF provides important constraints on the X-ray emissivity of the radio sources as well as on the clustering properties of radio and X-ray sources. These constraints are subject to a number of modeling parameters, e.g. the X-ray luminosity evolution, clustering evolution, the radio luminosity function, cosmological model, etc. For reasonable choices of paramters the X-ray/FIRST CCF is consistent with a correlation scale length of 6/h Mpc. This is somewhat smaller than the scale length inferred from the autocorrelation function of the FIRST survey and implies that X-ray sources are less strongly clustered than strong radio sources, a result which is consistent with previous constraints on X-ray clustering. The X-ray/GB6-PMN CCF is several times larger and is likely to be dominated by Poisson fluctuations. This implies that 2 percent of the diffuse X-ray background arises from the GB6-PMN sources.
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