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

By R. Krivonos, M. Revnivtsev, A. Lutovinov, S. Sazonov, E. Churazov, R. M. Iki, Moscow, R. Mpa, Garching, Heidelberg · Germany. 2007

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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 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 S lim = 1.1 × 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) × 10 −3 sources per deg 2 at fluxes >1.43 × 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.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/0ff5b3b33e1dd85fdce09e6954a0b479263b2a07

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Citations in the corpus

Magnetic Fields in Supernova Remnants and Pulsar-Wind Nebulae (2011, background): “30.5, Krivonos et al. 2007) and by non-imaging instruments BeppoSAX (Cas A to 80 keV; Favata et al. 1997) and Suzaku HXD (Cas A [to 40 keV], Maeda et al. 2009; G347.”
The PalermoSwift-BAT hard X-ray catalogue: II. Results after 39 months of sky survey (2009, methodology): “Converting this log(N) − log(S ) into the 17– 60 keV band, our results are in full agreement with those reported by Krivonos et al. (2007) for the INTEGRAL survey.”
THE 22 MONTH SWIFT-BAT ALL-SKY HARD X-RAY SURVEY (2009, background): “Recently INTEGRAL-IBIS has provided some observations (Bird et al. 2007; Beckmann et al. 2006, 2009; Krivonos et al. 2007) that are much more sensitive but have concentrated on certain regions of the sky; the exposure in the latest IBIS ‘all-sky’ catalog varies from one part of the sky to another…”
THE SPACE DENSITY OF COMPTON-THICK ACTIVE GALACTIC NUCLEUS AND THE X-RAY BACKGROUND (2009, background): “Now, thanks to the wide-area surveys at high energies performed with the INTEGRAL/IBIS (Beckmann et al. 2006; Krivonos et al. 2007) and the Swift/Burst Alert Telescope (BAT; Tueller et al. 2008), it is possible to study a well-defined sample of CT AGN in the local Universe.”
THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY (NuSTAR) HIGH-ENERGY X-RAY MISSION (2013, background): “By contrast, the directly resolved fraction of the XRB at the 20–30 keV peak from current > 10 keV surveys is only ∼ 2% (e.g., Krivonos et al. 2007; Ajello et al. 2008), and while the sources detected in Chandra and XMM-Newton surveys must resolve at least an order of magnitude more, no direct…”
High-mass X-ray binaries in the Milky Way (2013, background): “IGRJ21343+4738 was discovered during deep observations with the INTEGRAL observatory (Krivonos et al., 2007; Bird et al., 2007b).”