X-ray sources as tracers of the large-scale structure in the Universe

Details X-ray sources as tracers of the large-scale structure in the Universe X-ray sources as tracers of the large-scale structure in the Universe

2000-01-11

arxiv.org/abs/astro-ph/0001182v1

Astronomy and Astrophysics

Astrophysics

Invited review presented at the Workshop X-ray Astronomy'99: Stellar endpoints, AGN and the diffuse X-ray background (Astrophy

Scientific paper

10.1063/1.1434614

We review the current status of studies of large-scale structure in the X-ray Universe. After motivating the use X-rays for cosmological purposes, we discuss the various approaches used on different angular scales including X-ray background multipoles, cross-correlations of the X-ray background with galaxy catalogues, clustering of X-ray selected sources and small-scale fluctuations and anisotropies in the X-ray background. We discuss the implications of the above studies for the bias parameter of X-ray sources, which is likely to be moderate for X-ray selected AGN and the X-ray background (~1-2). We finally outline how all-sky X-ray maps at hard X-rays and medium surveys with large sky coverage could provide important tests for the cosmological models.

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