NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-20 T02:44:16 PDT
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For refcode 2007A&A...475..775K:
Retrieve 403 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by European Southern Observatory (ESO). Reproduced by permission
2007A&A...475..775K INTEGRAL/IBIS all-sky survey in hard X-rays Krivonos, R.; Revnivtsev, M.; Lutovinov, A.; Sazonov, S.; Churazov, E.; Sunyaev, R. Abstract. 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 ~33 Ms. Approximately 12% and 80% of the sky has been covered to limiting fluxes lower than 1 and 5 mCrab, respectively. Our catalog of detected sources includes 403 objects, 316 of which exceed a 5{sigma} 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 log N-log S relation of non-blazar AGNs is based on 68 sources located at Galactic latitudes |b| > 5^degree^, where the survey is characterized by high identification completeness, with fluxes higher than S_lim = 1.1 x 10^-11^ erg s^-1^ cm^-2^(~0.8 mCrab) in the 17-60 keV 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) x 10^-3^ sources per deg^2^ at fluxes > 1.43 x 10^-11^ erg s^-1^ cm^-2^(>1 mCrab). Those AGNs with fluxes higher than S_lim 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 (<~70 Mpc) AGNs, which reflects the large-scale structure in the local Universe. Key words: surveys, X-rays: general, Galaxy: general, galaxies: Seyfert, cosmology: large-scale structure of Universe
Retrieve 403 NED objects in this reference.
Please click here for ADS abstract

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