Detection of the Angular Correlation of Faint X-ray Sources

Details Detection of the Angular Correlation of Faint X-ray Sources Detection of the Angular Correlation of Faint X-ray Sources

1995-10-06

arxiv.org/abs/astro-ph/9510040v1

Astronomy and Astrophysics

Astrophysics

14 pages, figures included, also available at http://hea-www.harvard.edu/~alexey/corr.ps . Accepted to ApJ Letters

Scientific paper

10.1086/309843

We have analyzed a set of deep ROSAT observations with a total sky coverage of 40 square degrees to search for clustering of faint X-ray sources. Using the resulting catalog of discrete X-ray sources, we detect, for the first time in X-rays, a positive correlation on angular scales of 0.5'-10'. When corrected for a bias due to limited spatial resolution which amplifies the correlation, the observed angular correlation function agrees well with that expected from the spatial correlation of optically selected quasars, provided that they comprise an appreciable fraction (>= ~50%) of detected X-ray sources.

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