IBISGPSCAT - First IBIS/ISGRI Soft Gamma-Ray Galactic Plane Survey Catalog

Overview

This table contains the First IBIS/ISGRI Soft Gamma-Ray Galactic Plane Survey Catalog. It is the first high-energy survey catalog obtained with the IBIS gamma-ray imager on board the INTEGRAL spacecraft. The analysis was performed on the first-year Core Program ISGRI data comprising both Galactic Plane Scan (GPS) and Galactic Centre Deep Exposure (GCDE) pointings for a total exposure time exceeding 5 Million seconds (Ms). This initial survey revealed the presence of ~120 sources detected with the unprecedented sensitivity of ~1 milliCrab (mCrab) in the 20 - 100 keV energy range. (Notice that 99 and 68 ISGRI counts per second (cps) correspond to 1 Crab in the 20 - 40 keV and 40 - 100 keV bands, respectively). Each source has been located to an accuracy of between 1' and 3', depending on its brightness. The outstanding IBIS capability to locate soft gamma-ray emitters allowed the catalog authors to identify most of the detected sources with already known Galactic X-ray binary systems, while 28 of the objects are of unknown nature.

Catalog Bibcode

2004ApJ...607L..33B

References

The first IBIS/ISGRI Soft Gamma-Ray Galactic Plane Survey Catalog.
    Bird A.J., Barlow E.J., Bassani L., Bazzano A., Bodaghee A., Capitanio F.,
    Cocchi M., Del Santo M., Dean A.J., Hill A.B., Lebrun F., Malaguti G.,
    Malizia A., Much R., Shaw S.E., Stephen J.B., Terrier R., Ubertini P.,
    Walter R.
   <Astrophys. J., 607, L33-L37 (2004)>
   =2004ApJ...607L..33B    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in September 2004 based on CDS table J/ApJ/607/L33/table1.dat.

Description

The data set consists of all Core Program observations (the Galactic Plane Scan and the Galactic Centre Deep Exposure) performed between 2003 February 28 (revolution 46) and October 10 (revolution 120), a total of 2529 pointings.

Parameters

Sequence_Number
A sequential catalog entry number. Sources can be referred to using this number and the recommended prefix of [BBB2004b]: e.g., the source with a sequence number of 1 is `[BBB2004b] 1'.

Name
The standard designation for the source. Sources discovered by INTEGRAL have been given names using the IGR prefix.

RA
The Right Ascension of the high-energy source in the selected equinox. This was given in J2000.0 coordinates and to a precision of 0.001 degrees in the original table.

Dec
The Declination of the high-energy source in the selected equinox. This was given in J2000.0 coordinates and to a precision of 0.001 degrees in the original table.

LII
The Galactic Longitude of the high-energy source.

BII
The Galactic Latitude of the high-energy source.

Limit_SB_Count_Rate
A '<' value for this parameter indicated that the quoted 20 - 40 keV count rate is a 2-sigma upper limit. Count rates derived from low-significance (< 6 sigma) detections are quoted as 2-sigma upper limits, notice.

SB_Count_Rate
The count rate (`flux') in the 20 - 40 keV energy band, in counts per second (cps). This can be converted to flux using the conversion factor 99 cps = 1 Crab in this band.

SB_Count_Rate_Error
The RMS uncertainty in the 20 - 40 keV count rate, in cps.

Limit_HB_Count_Rate
A '<' value for this parameter indicated that the quoted 40 - 100 keV count rate is a 2-sigma upper limit. Count rates derived from low-significance (< 6 sigma) detections are quoted as 2-sigma upper limits, notice.

HB_Count_Rate
The count rate (`flux') in the 40 - 100 keV energy band, in counts per second (cps). This can be converted to flux using the conversion factor 68 cps = 1 Crab in this band.

HB_Count_Rate_Error
The RMS uncertainty in the 40 - 100 keV count rate, in cps.

Significance
The detection significance for the high-energy source in the primary detection band of 30 - 50 keV, or in the 20 - 40 keV band if the value of the significance_flag parameter is set to 'S'.

Significance_Flag
This flag parameter is set to 'S' to indicate that the significance quoted is for the 20 - 40 keV band rather than for the primary detection band of 30 - 50 keV.

Exposure
The on-source exposure time, in kiloseconds (ksec), adjusted for off-axis vignetting effects.

Source_Type
The astrophysical type of the high-energy source. The following abbreviations are used:

               A = atoll source
             AGN = active galactic nucleus
               B = burster (neutron star)
             BHC = black hole candidate
         Cluster = cluster of galaxies
              CV = cataclysmic variable
               D = dipping source
               G = globular cluster X-ray source
            HMXB = high-mass X-ray binary
            LMXB = low-mass X-ray binary
             PSR = radio pulsar
             PWN = pulsar wind nebula
             SGR = soft gamma repeater
             Sy1 = Seyfert 1 galaxy
             Sy2 = Seyfert 2 galaxy
             SNR = supernova remnant
               T = transient
               U = ultrasoft source
              XP = X-ray pulsar
               Z = Z-type source (neutron stars)
               ? = unknown type

Class
The HEASARC Browse object classification, based on the value of the source_type parameter (the first part only).

Contact Person

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

Page Author: Browse Software Development Team
Last Modified: Monday, 08-Nov-2004 11:25:26 EST