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INTGCCAT - INTEGRAL IBIS Hard X-Ray Survey of Galactic Center

HEASARC
Archive

Overview

From August 23 through September 24, 2003, the INTEGRAL Observatory conducted a deep survey of the Galactic Center region with a record-breaking sensitivity at energies above 20keV. The authors analyzed the images of the Galactic Center region obtained with the ISGRI detector of the IBIS telescope (15 - 200 keV) and this table contains their catalog of detected sources. A total of 60 sources with fluxes above 1.5 milliCrab were detected in the range from 18 to 60 keV (1 mCrab = 1.36 x 10^-11 erg/s/cm^2 in this energy band for a source with a power-law spectrum with a photon index of 2.1) above a detection threshold of 6.5 sigma which was chosen to avoid the strong effect of systematic uncertainties. The nature of 51 of the 60 sources is known: most of them (38 of 51) are low-mass X-ray binaries, and the remaining 13 include 5 high-mass X-ray binaries, 2 cataclysmic variables, an anomalous X-ray pulsar, a soft gamma repeater and three extragalactic objects.

Catalog Bibcode

2004AstL...30..382R

References

A hard X-ray survey of the galactic-center region with the IBIS telescope of
the INTEGRAL observatory: a catalog of sources.
    Revnivtsev M.G., Sunyaev R.A., Varshalovich D.A., Zheleznyakov V.V.,
    Cherepashchuk A.M., Lutovinov A.A., Churazov E.M., Grebenev S.A.,
    Gilfanov M.R.
   <Pis'ma Astron. Zh. 30, 430 (2004)>
   =2004PAZh...30..430R
   =2004AstL...30..382R

Provenance

This table was created by the HEASARC in February 2005 based on CDS Catalog J/PAZh/30/430 (the catalog.dat file).

Notes on Individual Sources

Two of the sources listed in this table, IGR J17544-2619 and IGR J17475-2822, were first detected by the INTEGRAL observatory during the observations made for this survey: (i) the source IGR J17544-2619 was detected only in a short series of observations: the maximum flux and the maximum detection significance in individual observing sessions are listed, and (ii) the source IGR J17475-2822 lies at a distance of 0.7 degrees from the Galactic Center and may be a superposition of several weaker point-like sources: observations with a higher angular resolution are required to clarify this circumstance.

Parameters

Source_Number
A running number for the hard X-ray source, in order of decreasing signal-to-noise ratio (SNR), i.e., the obect with source_number=1 has the highest SNR value.

RA
The Right Ascension of the source in the selected equinox. This was given in J2000 decimal degrees and to a precision of 0.001 degrees in the original table. The localization accuracy of the Crab Nebula is approximately 0.4 arcminutes (1-sigma). For fainter sources, the localization accuracy worsens to about 2 - 3 arcminutes (90% confidence).

Dec
The Declination of the source in the selected equinox. This was given in J2000 decimal degrees and to a precision of 0.001 degrees in the original table. The localization accuracy of the Crab Nebula is approximately 0.4 arcminutes (1-sigma). For fainter sources, the localization accuracy worsens to about 2 - 3 arcminutes (90% confidence).

LII
The Galactic Longitude of the source.

BII
The Galactic Latitude of the source.

Flux
The flux of the source in the 18 - 60 keV energy band, in mCrab. (1 mCrab = 1.36 x 10^-11 erg/s/cm^2 in this energy band for a source with a power-law spectrum with a photon index of 2.1).

Flux_Error
The mean error in the flux, in mCrab. This is the statistical flux uncertainty only, and does not include the systematic uncertainty in the absolute flux value, which is estimated to be about 10%.

SNR
The signal-to-noise ratio (SNR) of the hard X-ray source.

Name
The identification of the X-ray source with either a previously known or new INTEGRAL source.

Source_Type
The classification of the X-ray source. Note that the following abbreviations have been used:

      LMXB: low mass X-ray binary
      HMXB: high mass X-ray binary
        XB: X-ray binary
        BH: black hole
        NS: neutron star
       AGN: active galactic nucleus
        CV: cataclysmic variable
       AXP: anomalous X-ray pulsar
       SGR: soft gamma repeater
  

Class
The HEASARC Browse class of the object, based on the value of the source_type parameter.


Contact Person

Questions regarding the INTGCCAT database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 28-Feb-2005