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Start Over Subject x-ray sources Facility INTEGRAL Validation Level 2
1. INTEGRAL all-sky survey of hard X-ray sources
ID:
ivo://CDS.VizieR/J/A+A/475/775
Title:
INTEGRAL all-sky survey of hard X-ray sources
Short Name:
J/A+A/475/775
Date:
21 Oct 2021
Publisher:
CDS
Description:
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 about 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 5{sigma} detection threshold on the time-averaged map of the sky, and the rest were detected in various subsamples of exposures.
2. INTEGRAL/IBIS 9-year Galactic hard X-ray survey
ID:
ivo://CDS.VizieR/J/A+A/545/A27
Title:
INTEGRAL/IBIS 9-year Galactic hard X-ray survey
Short Name:
J/A+A/545/A27
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present sky images, sensitivity maps, and catalogs of detected sources in the three energy bands 17-60, 17-35, and 35-80keV in the Galactic plane at |b|<17.5 degrees. The total number of sources in the reference 17-60keV band includes 402 objects exceeding a 4.7{sigma} detection threshold on the nine-year time-averaged map. Among the identified sources with known and tentatively identified natures, 253 are Galactic objects (108 low-mass X-ray binaries, 82 high-mass X-ray binaries, 36 cataclysmic variables, and 27 are of other types), and 115 are extragalactic objects, including 112 active galactic nuclei (AGNs) and 3 galaxy clusters. The sample of Galactic sources with S/N>4.7 sigma has an identification completeness of ~92%, which is valuable for population studies. Since the survey is based on the nine-year sky maps, it is optimized for persistent sources and may be biased against finding transients.
3. INTEGRAL reference catalog
ID:
ivo://CDS.VizieR/J/A+A/411/L59
Title:
INTEGRAL reference catalog
Short Name:
J/A+A/411/L59
Date:
21 Oct 2021
Publisher:
CDS
Description:
We describe the INTEGRAL reference catalog which classifies previously known bright X-ray and gamma-ray sources before the launch of INTEGRAL. These sources are, or have been at least once, brighter than ~1mCrab above 3keV, and are expected to be detected by INTEGRAL. This catalog is being used in the INTEGRAL Quick Look Analysis to discover new sources or significantly variable sources. We compiled several published X-ray and gamma-ray catalogs, and surveyed recent publications for new sources. Consequently, there are 1122 sources in our INTEGRAL reference catalog. In addition to the source positions, we show an approximate spectral model and expected flux for each source, based on which we derive expected INTEGRAL counting rates. Assuming the default instrument performances and at least ~10^5^s exposure time for any part of the sky, we expect that INTEGRAL will detect at least ~700 sources below 10keV and ~400 sources above 20keV over the mission life.
4. INTEGRAL X-ray source in Galactic center
ID:
ivo://CDS.VizieR/J/PAZh/30/430
Title:
INTEGRAL X-ray source in Galactic center
Short Name:
J/PAZh/30/430
Date:
21 Oct 2021
Publisher:
CDS
Description:
From August 23 through September 24, 2003, the INTEGRAL Observatory conducted a deep survey of Galactic-Center region with a record-breaking sensitivity at energies above 20keV. We detected a total of 60 sources with fluxes above 1.5mCrab in the range 18-60keV.
5. INTEGRAL 14-year Galactic hard X-ray sources
ID:
ivo://CDS.VizieR/J/MNRAS/470/512
Title:
INTEGRAL 14-year Galactic hard X-ray sources
Short Name:
J/MNRAS/470/512
Date:
21 Oct 2021
Publisher:
CDS
Description:
The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) continues to successfully work in orbit after its launch in 2002. The mission provides the deepest ever survey of hard X-ray sources throughout the Galaxy at energies above 20keV. We report on a catalogue of new hard X-ray source candidates based on the latest sky maps comprising 14yr of data acquired with the IBIS telescope onboard INTEGRAL in the Galactic Plane (|b|<17.5{deg}). The current catalogue includes in total 72 hard X-ray sources detected at S/N>4.7{sigma} and not known to previous INTEGRAL surveys. Among them, 31 objects have also been detected in the on-going all-sky survey by the BAT telescope of the Swift observatory. For 26 sources on the list, we suggest possible identifications: 21 active galactic nuclei, two cataclysmic variables, two isolated pulsars or pulsar wind nebulae and one supernova remnant; 46 sources from the catalogue remain unclassified.
6. Sources detected by ISGRI
ID:
ivo://CDS.VizieR/J/A+A/467/585
Title:
Sources detected by ISGRI
Short Name:
J/A+A/467/585
Date:
21 Oct 2021
Publisher:
CDS
Description:
In its first 4 years of observing the sky above 20keV, INTEGRAL-ISGRI has detected 500 sources, around half of which are new or unknown at these energies. Follow-up observations at other wavelengths revealed that some of these sources feature unusually large column densities, long pulsations, and other interesting characteristics. We investigate where new and previously-known sources detected by ISGRI fit in the parameter space of high-energy objects, and we use the parameters to test correlations expected from theoretical predictions. For example, the influence of the local absorbing matter on periodic modulations is studied for Galactic High-Mass X-ray Binaries (HMXBs) with OB supergiant and Be companions. We examine the spatial distribution of different types of sources in the Milky Way using various projections of the Galactic plane, in order to highlight signatures of stellar evolution and to speculate on the origin of the group of sources whose classifications are still uncertain.

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