IBISCAT4 - Fourth IBIS/ISGRI Soft Gamma-Ray Survey Catalog

Overview

This table contains the fourth soft gamma-ray source catalog based on observations obtained with the IBIS/ISGRI gamma-ray imager on board the INTEGRAL satellite. The scientific data set is based on more than 70 Ms of high-quality observations performed during the first 5.5 years of the Core Program and public IBIS/ISGRI observations. Compared to previous IBIS surveys, this catalog includes a substantially increased coverage of extragalactic fields, and comprises more than 700 high-energy sources detected in the energy range of 17-100 keV, including both transients and faint persistent objects that can only be revealed with longer exposure times.

Catalog Bibcode

2010ApJS..186....1B

References

The Fourth IBIS/ISGRI Soft Gamma-Ray Survey Catalog.
     Bird A.J., Bazzano A., Bassani L., Capitanio F., Fiocchi M., Hill A.B.,
     Malizia A., McBride V.A., Scaringi S., Sguera V., Stephen J.B.,
     Ubertini P., Dean A.J., Lebrun F., Terrier R., Renaud M., Mattana F.,
     Gotz D., Rodriguez J., Belanger G., Walter R., Winkler C.
   <Astrophys. J. Suppl., 186, 1-9 (2010)>
   =2010ApJS..186....1B    (SIMBAD/NED BibCode)

Provenance

This database table was originally ingested by the HEASARC in January 2010 based on the machine-readable version of Table 3 of the above-cited paper, which was obtained from the electronic ApJ website. It was updated in November 2014 to convert the error_radius values to arcseconds in order to conform to HEASARC conventions.

Parameters

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

Source_Flag
This parameter is a flag which can have the following non-blank values:

      b = New detection since the third catalog;
      j = Blended source. Position determined by simultaneous fitting is
          reliable, but other measured values (flux, significance) may be
          contaminated by nearby source(s) and are unreliable.

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.

Error_Radius
The positional error of the high-energy source, in arcseconds, expressed as the radius of the 90% confidence circle. This was given as arcminutes with a precision of 0.1 arcminutes in the original table.

SB_Flux_Limit
This parameter is set to '<' if the associated soft-band flux of the particular source is an upper limit rather than a detection.

SB_Flux
The time-averaged flux of the high-energy source in the soft energy band (20 - 40 keV), in units of milliCrab (mCrab). Appropriate conversion factors for this band are 10 mCrab = 7.57 x 10^-11 erg/cm²/s = 1.71 x 10^-3 photons/cm²/s.

SB_Flux_Error
The uncertainty in the time-averaged 20 - 40 keV flux, in mCrab.

HB_Flux_Limit
This parameter is set to '<' if the associated hard-band flux of the particular source is an upper limit rather than a detection.

HB_Flux
The time-averaged flux of the high-energy source in the hard energy band (40 - 100 keV), in units of milliCrab (mCrab). Appropriate conversion factors for this band are 10 mCrab = 9.42 x 10^-11 erg/cm²/s = 9.67 x 10^-4 photons/cm²/s.

HB_Flux_Error
The uncertainty in the time-averaged 40 - 100 keV Flux, in mCrab.

Source_Type
The astrophysical type(s) of the high-energy source. Up to 4 types may be given: these follow the convention of Liu et al. (2007, A&A, 469, 807), wherever possible. The following abbreviations have been used:

          A = Atoll source (neutron star);
        AGN = Active galactic nuclei;
        AXP = Anomalous X-ray pulsar;
          B = Burster (neutron star);
         Be = B-type emission-line star;
         BH = Black hole (confirmed mass evaluation);
        BHC = Black hole candidate;
         BL = broad line;
    Cluster = Cluster of galaxies;
         CV = Cataclysmic variable;
          D = Dipping source;
         DN = Dwarf Nova;
          G = Globular Cluster X-ray source;
        GRB = Gamma-Ray Burst;
       HMXB = High-mass X-ray binary;
         IP = Intermediate Polar;
       LMXB = Low-mass X-ray binary;
          M = Microquasar;
  Mol Cloud = Molecular cloud;
         NL = narrow line;
         NS = Neutron Star;
          P = Polar;
        PSR = Radio pulsar;
        PWN = Pulsar wind nebula;
        QSO = Quasar;
         RG = Radio Galaxy;
       SFXT = Supergiant Fast X-ray Transient;
         SG = Supergiant;
        SGR = Soft gamma-ray repeater;
        SNR = Supernova remnant;
         Sy = Seyfert galaxy;
       Symb = Symbiotic star;
          T = Transient source;
         XB = Galactic X-ray binary;
      XBONG = X-ray bright, optically normal galaxy;
         XP = X-ray pulsar;
          Z = Z-type source (neutron star)

Variability_Flag
This parameter contains a flag which indicates the presence of source variability in the 20-40 keV band. A value of 'Y' indicates a bursticity of > 1.1, i.e., a 10% increase in significance can be obtained by selecting a subset of the data. A flag value of 'YY' indicates a bursticity of > 4, indicating a strongly variable source. In both cases, the peak flux is defined as the mean flux during the single period of time for which the significance is maximized.

Peak_SB_Flux
If the source is variable, this parameter contains the peak 20-40 keV band flux, i.e., the flux measured during the largest detected outburst of the source, in mCrab.

Peak_SB_Flux_Error
The uncertainty in the peak 20-40 keV band flux, in mCrab.

Significance
The maximum significance of the high-energy source in a single map. This is given since it provides the best indication of the robustness of the source detection. Refer to the map_codes parameter in order to identify the map which has this maximum significance.

Exposure
The corrected on-source exposure time, in seconds (s), given to a precision of 100 seconds. This parameter was given in kiloseconds (ks) in the original, as-published table.

Map_Codes
This parameter identifies the energy-band map in which the source had its maximum significance: (B1) 20 - 40 keV; (B2) 30 - 60 keV; (B3) 20 - 100 keV; (B4) 17 - 30 keV; (B5) 18 - 60 keV; a prefix of "RXXX" indicates a detection in INTEGRAL revolution XXX, a prefix of "SXXX" indicates a detection in an INTEGRAL revolution sequence beginning at INTEGRAL revolution XXX; (ST) indicates staring data. Burst indicates that significance and position were obtained from a data subset defined by bursticity analysis (see section 2.4 of the reference paper). B1GCF indicates derived from fitting of the Galactic Center region (see section 3 of the reference paper).

Class
The HEASARC Browse object classification, based on the value of the source_type parameter (typically the most specific part).

Contact Person

Questions regarding the IBISCAT4 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: Wednesday, 12-Nov-2014 15:00:04 EST