INTEGRAL/IBIS 17-yr hard X-ray all-sky survey

• Main Authors: Krivonos, Roman, Sazonov, Sergey, Kuznetsova, Ekaterina, Lutovinov, Alexander, Mereminskiy, Ilya, Tsygankov, Sergey
• Format: Journal Article
• Language: English
• Published: 13-01-2022
• Subjects: Physics - High Energy Astrophysical Phenomena
• DOI: 10.48550/arxiv.2111.02996

The International Gamma-Ray Astrophysics Laboratory (INTEGRAL), launched in
2002, continues its successful work in observing the sky at energies E>20 keV.
The legacy of the mission already includes a large number of discovered or
previously poorly studied hard X-ray sources. The growing INTEGRAL archive
allows one to conduct an all-sky survey including a number of deep
extragalactic fields and the deepest ever hard X-ray survey of the Galaxy.
Taking advantage of the data gathered over 17 years with the IBIS coded-mask
telescope of INTEGRAL, we conducted survey of hard X-ray sources, providing
flux information from 17 to 290 keV. The catalog includes 929 objects, 890 of
which exceed a detection threshold of 4.5 sigma and the rest are detected at
4.0-4.5 sigma and belong to known cataloged hard X-ray sources. Among the
identified sources of known or suspected nature, 376 are associated with the
Galaxy and Magellanic clouds, including 145 low-mass and 115 high-mass X-ray
binaries, 79 cataclysmic variables, and 37 of other types; and 440 are
extragalactic, including 429 active galactic nuclei (AGNs), 2 ultra-luminous
sources, one supernova (AT2018cow) and 8 galaxy clusters. 113 sources remain
unclassified. 46 objects are detected in the hard X-ray band for the first
time. The LogN-LogS distribution of 356 non-blazar AGNs is measured down to a
flux of 2E-12 erg/s/cm2 and can be described by a power law with a slope of
1.44 +/- 0.09 and normalization 8E-3/deg2 at 1E-11 erg/s/cm2. The LogN-LogS
distribution of unclassified sources indicates that the majority of them are of
extragalactic origin.