SIMBAD references

2007A&A...475..775K - Astronomy and Astrophysics, volume 475, 775-784 (2007/11-4)

INTEGRAL/IBIS all-sky survey in hard X-rays.


Abstract (from CDS):

We present results of an all-sky hard X-ray survey based on almost four years of observations with the IBIS telescope onboard the INTEGRAL observatory. The dead time-corrected exposure of the survey is ∼33Ms. Approximately 12% and 80% of the sky has been covered to limiting fluxes lower than 1 and 5mCrab, respectively. Our catalog of detected sources includes 403 objects, 316 of which exceed a 5σ detection threshold on the time-averaged map of the sky, and the rest were detected in various subsamples of exposures. Among the identified sources, 219 are Galactic (90 low-mass X-ray binaries, 76 high-mass X-ray binaries, 21 cataclysmic variables, 6 coronally active stars, and other types) and 137 are extragalactic, including 130 active galactic nuclei (AGNs) and 3 galaxy clusters. We derived number-flux functions of AGNs and Galactic sources. The logN-logS relation of non-blazar AGNs is based on 68 sources located at Galactic latitudes |b|>5°, where the survey is characterized by high identification completeness, with fluxes higher than Slim=1.1x10–11erg/s/cm2 (∼0.8mCrab) in the 17-60keV energy band. The cumulative AGN number-flux function can be described by a power law with a slope of 1.62±0.15 and normalization of (5.7±0.7)x10–3 sources per deg2 at fluxes >1.43x10–11erg/s/cm2 (>1mCrab). Those AGNs with fluxes higher than Slim make up ∼1% of the cosmic X-ray background at 17-60 keV. We present evidence of strong inhomogeneity in the spatial distribution of nearby (≲70Mpc) AGNs, which reflects the large-scale structure in the local Universe.

Abstract Copyright:

Journal keyword(s): surveys - X-rays: general - Galaxy: general - galaxies: Seyfert - cosmology: large-scale structure of Universe

VizieR on-line data: <Available at CDS (J/A+A/475/775): table1.dat table2.dat>

Nomenclature: Table 1: [KRL2007b] NNN (Nos 1-403).

CDS comments: In table 1, IGR J20569-4940 is a misprint for IGR J20569+4940

Simbad objects: 420

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