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- W83510633 abstract "According to theoretical models for structure formation, massive black holes (MBH ~ 104-107 Msun) are predicted to be abundant in the early Universe (z > 6), but at present there are no observational evidences. The detection of such a population would provide unique constraints on the Massive Black Hole formation mechanism and subsequent evolution. According to XRB synthesis models and theoretical models for structures formation, the early phase of BH growth is expected to happen in a highly obscured environment. Sensitive X-ray surveys have the unique capabilities to detect and study obscured AGN in the early Universe. The space density of luminous QSO (LX > 1044 erg s-1) exponentially declines above z ~ 3 (Fig. 1; Brusa+08) with a behaviour similar to that observed for optically selected SDSS QSO (continuous lines in Fig. 2). Source counts may be computed by extrapolating the results of Fig. 1. The first QSO are likely to have relatively low masses and luminosities. To estimate their number counts alternative possibilities were explored The first (named maxXLF) assumes a constant space density for Seyfert-like AGN up to z=10, the second (continuous curves in Fig. 2) is based on SAM models for structure formation (Marulli+09). The predicted source counts for the 3 different models are reported in Figs. 3 and 4 along with the number counts predicted by other theoretical models as labeled. The total number of high-z AGN which will be eventually detected by IXO, depends from the survey strategy. In Fig. 5 we report the sky coverage of a possible “survey”program totalizing about 6 months of IXO observations. The predicted numbers of z > 4 , z > 6 QSO in IXO surveys for different assumptions on the XLF evolution and a given Wide Field Imager size is reported in the table." @default.
- W83510633 created "2016-06-24" @default.
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- W83510633 date "2009-01-01" @default.
- W83510633 modified "2023-09-23" @default.
- W83510633 title "The Quest for Very High Redshift Black Holes" @default.
- W83510633 hasPublicationYear "2009" @default.
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