Deep Hard X-ray Survey of the M81 Field Based on INTEGRAL Data

Abstract

We have carried out a deep survey of the M81 field in the 25-60 keV energy band based on long-term (2003-2023) INTEGRAL observations. A record sensitivity of 0.16 mCrab at a detection significance of 4 sigma has been achieved in the central part of the field owing to the long accumulated exposure (19.2 Ms). The total area of the survey is 1004 deg^2 at a sensitivity level better than 0.72 mCrab. We have produced a catalog of sources detected at a significance level higher than 4 sigma. It contains 51 objects most of which are active galactic nuclei (AGNs). The median redshift of the Seyfert galaxies in the catalog is z=0.0366. Six sources have not been detected previously in any of the X-ray surveys. According to the available indirect data, all of them and two more sources that have already been entered previously into the INTEGRAL survey catalogs can also be AGNs, including those with strong internal absorption.

arXiv comment6 pages, 5 figures, 1 table. Accepted for publication in Astronomy Letters

References in corpus (29)

• The SIMBAD astronomical database
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• The Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey I: X-ray Properties of Clusters Detected as Extended X-ray Sources
• BAT AGN Spectroscopic Survey - V. X-ray properties of the Swift/BAT 70-month AGN catalog
• Revised Catalog of GALEX Ultraviolet Sources. I. The All-sky Survey: GUVcat_AIS
• The 105 month Swift-BAT all-sky hard X-ray survey
• The SRG X-ray orbital observatory, its telescopes and first scientific results
• The first XMM-Newton slew survey catalogue: XMMSL1
• A Quick Look at the $3$GHz Radio Sky I. Source Statistics from the Very Large Array Sky Survey
• 2SXPS: An improved and expanded Swift X-ray telescope point source catalog
• INTEGRAL/IBIS all-sky survey in hard X-rays
• Cobalt-56 gamma-ray emission lines from the type Ia supernova 2014J
• The Palermo Swift-BAT hard X-ray catalogue III. Results after 54 months of sky survey
• Cosmicflows-4
• The INTEGRAL IBIS/ISGRI System Point Spread Function and Source Location Accuracy
• Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions
• INTEGRAL/IBIS 7-year All-Sky Hard X-Ray Survey. Part I: Image Reconstruction
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• An X-ray selected catalog of extended galaxy clusters from the ROSAT All-Sky Survey (RXGCC)
• Morphological properties of galaxies in different Local Volume environments
• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• The Galactic LMXB Population and the Galactic Centre Region
• INTEGRAL/IBIS deep extragalactic survey: M81, LMC and 3C 273/Coma fields
• X-ray absorption in INTEGRAL AGN: Host galaxy inclination
• Cutoff in the hard X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1
• INTEGRAL view of AGN
• 15 years of Galactic surveys and hard X-ray Background measurements
• New Active Galactic Nuclei Detected by the ART-XC and eROSITA Telescopes Onboard the SRG Observatory during an All-Sky X-ray Survey