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ISGRI4YRCT - INTEGRAL ISGRI 4-Year Source Catalog

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Overview

In its first 4 years of observing the sky above 20 keV, the INTEGRAL Soft Gamma-ray Imager (ISGRI) detected ~ 500 sources, around half of which were 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. The authors investigated where new and previously-known sources detected by ISGRI fit in the parameter space of high-energy objects, and they used the parameters to test correlations expected from theoretical predictions. For example, the influence of the local absorbing matter on periodic modulations was studied for Galactic High-Mass X-ray Binaries (HMXBs) with OB supergiant and Be companions. In their paper, they examined 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 were still uncertain.

This table contains all 499 sources detected by ISGRI listed in the reference paper, with the exception of the source 'PSR B1841-04' which was removed from the electronic version of the table by the CDS, after discussion with the author. The table contains the most precise coordinates and error radii available in the literature. Classifications are provided for all sources. When available, the published photoelectric absorption in the X-rays, distances/redshifts, and pulsation and orbital periods are also listed.


Catalog Bibcode

2007A&A...467..585B

References

A description of sources detected by INTEGRAL during the first 4 years
of observations.
    Bodaghee A., Courvoisier T.J.-L., Rodriguez J., Beckmann V., Produit N.,
    Hannikainen D., Kuulkers E., Willis D.R., Wendt G.
   <Astron. Astrophys., 467, 585-596 (2007)>
   =2007A&A...467..585B

Provenance

This table was created by the HEASARC in April 2011 based on CDS catalog J/A+A/467/585 file table1.dat.

Parameters

Name
The name of the INTEGRAL source. Most sources have more than 1 name owing to detections by various instruments operating at different energies. As in Ebisawa et al. (2003, A&A, 411, L59), the authors selected names that are commonly used in high-energy astrophysics and that are accepted as an identifier in SIMBAD. This eases comparisons with other catalogs.

RA
The Right Ascension of the source in the selected equinox. This was given in J2000.0 equatorial coordinates with precisions of 0.001 - 1 seconds of time in the origional table. Source positions are from the X-rays unless a more accurate position at other wavelengths is known for a confirmed counterpart.

Dec
The Declination of the source in the selected equinox. This was given in J2000.0 equatorial coordinates with precisions of 0.01 - 60 arcseconds in the origional table. Source positions are from the X-rays unless a more accurate position at other wavelengths is known for a confirmed counterpart.

LII
The Galactic Longitude of the source.

BII
The Galactic Latitude of the source.

Error_Radius
The positional uncertainty of the source, in arcminutes.

Ref_Position
The ADS bibliographic code (bibcode) of the reference from which the source position was taken.

NH
The absorbing hydrogen column density nH towards the source, in H atoms cm-2. Column densities were gathered by the authors from the literature whenever a model fit to the X-ray spectrum required an absorption component. Extracting a single nH for a source and comparing this value to those of other sources is not a straightforward exercise since intrinsic column densities are not static. A measurement made during flaring or quiescent periods, or at different orbital epochs, will heavily influence the nH. The geometry of the system, the energy range of the satellite that gathered the data, and the model used to describe the resulting spectrum also affect the nH value. Therefore, the uncertainties are often large or only upper limits are provided. Whenever possible, the authors selected the nH value of the model that best fit a recent X-ray spectrum taken with a telescope that covers the soft X-ray domain well.

NH_Neg_Err
The negative (lower) error in the absorbing hydrogen column density nH towards the source, in H atoms cm-2.

NH_Pos_Err
The positive (upper) error in the absorbing hydrogen column density nH towards the source, in H atoms cm-2.

Ref_NH
The ADS bibliographic code (bibcode) of the reference from which the column density information was taken.

Pulse_Period
The spin (pulse) period of the source, in seconds. This has been reported for a large number of Galactic objects detected by ISGRI. Some systems are known to spin down, so the authors selected the most recent value from RXTE whenever possible, even though this level of precision is not needed for the purpose of their study. The spin period can refer to the spin of the neutron star in X-ray binaries, or to the spin of the White Dwarf in cataclysmic variable (CVs). The catalogs of Liu et al. (2000, A&AS, 147, 25) and Liu et al. (2001, A&A, 368, 1021), and the systematic analysis of RXTE data by Wen et al. (2006, ApJS, 163, 372)) are among the main references of spin and orbital periods in this work.

Pulse_Period_Neg_Err
The negative (lower) error in the spin (pulse) period of the source, in seconds.

Pulse_Period_Pos_Err
The positive (upper) error in the spin (pulse) period of the source, in seconds.

Ref_Pulse_Period
The ADS bibliographic code (bibcode) of the reference from which the spin (pulse) period was taken.

Orbital_Period
The orbital period of the source, in days. This has been reported for a large number of Galactic objects detected by ISGRI. The catalogs of Liu et al. (2000) and Liu et al. (2001), and the systematic analysis of RXTE data by Wen et al. (2006) are among the main references of spin and orbital periods in this work.

Orbital_Period_Neg_Err
The negative (lower) error in the orbital period of the source, in days.

Orbital_Period_Pos_Err
The positive (upper) error in the orbital period of the source, in days.

Ref_Orbital_Period
The ADS bibliographic code (bibcode) of the reference from which the orbital period was taken.

Distance
The distance to the source, in kiloparsecs (kpc). Objects in the Milky way and Magellanic Clouds have distances given in kpc. Opinions sometimes differ as to the distances of some Galactic sources. The authors favored distance measurements that were recent, precise and that were the least model-dependent. Even so, the distance uncertainties quoted in the literature can be large. The distance measurements are from, among others, White & van Paradijs (1996, ApJ, 473, L25), Grimm et al. (2002, A&A, 391, 923), Jonker & Nelemans (2004, MNRAS, 354, 355), Bassani et al. (2006, ApJ, 635, L65), Beckmann et al. (2006, ApJ, 638, 642), or from references in Liu et al. (2000, A&AS, 147, 25) and Liu et al. (2001, A&A, 368, 1021). Note that the distances in Grimm et al. (2002) sometimes represent an average over several competing distance estimates.

Distance_Neg_Err
The negative (lower) error in the distance to the source, in kpc.

Distance_Pos_Err
The positive (upper) error in the distance to the source, in kpc.

Ref_Distance
The ADS bibliographic code (bibcode) of the reference from which the distance was taken.

Redshift
The redshift of the source, if it is more distant than the Magellanic Clouds.

Redshift_Neg_Err
The negative (lower) error in the redshift of the source.

Redshift_Pos_Err
The positive (upper) error in the redshift of the source.

Ref_Redshift
The ADS bibliographic code (bibcode) of the reference from which the redshift was taken.

Source_Type
The source classification based on the concensus opinion in the literature. Peculiar behaviour, such as quasi-periodic oscillations, transience, and Z-track or Atoll shapes, are also noted (usually parenthetically following the primary source type class), since they can help one to distinguish between systems within the same class. If the source classification has not yet been confirmed, it is simply called 'unclassified'. The transient identification of a source is given by any of the following: 1) the label was assigned by its discoverers or by other authors (e.g. 'Discovery of a new transient IGR J...'); 2) the source has not been detected by anyone else since its discovery announcement, e.g. it is not listed in the all-data, all-sky catalogs of Bird et al. 2006, ApJ, 636, 765; 2007, ApJS, 170, 175); 3) the source is detected only in mosaic images of a single or a few consecutive revolutions according to Bird et al. (2007), but not in their all-data mosaic images.

The abbreviations used in this parameter have the following meanings:

     Abbreviation         Meaning

     A                    atoll
     AGN                  active galactic nucleus
     AXP                  anomalous X-ray pulsar
     B                    burster
     BHC                  black hole candidate
     BL Lac               BL Lac object
     Be                   Be star
     Blazar               Blazar
     CV                   cataclysmic variable
     Cluster of Galaxies  Cluster of Galaxies
     D                    dipping
     DN                   dwarf nova
     E                    eclipsing
     F                    flaring
     GRB                  gamma-ray burst
     GRS                  gamma-ray source
     HMXB                 high-mass X-ray binary
     IP                   intermediate polar
     LMXB                 low-mass X-ray binary
     Mol. Cloud           molecular cloud
     N                    nova
     P                    pulsar
     PWN                  pulsar wind nebula
     QPO                  quasi-periodic oscillations
     QSO                  quasar
     RS CVn               RS CVn type
     RS CVn Star          RS CVn star
     Radio Galaxy         radio galaxy
     Radio P              radio pulsar
     SFXT                 supergiant fast X-ray transient
     SG                   OB supergiant
     SGR                  soft gamma repeater
     SNR                  supernova remnant
     Sey                  Seyfert galaxy
     Sey-1                Seyfert 1 galaxy
     Sey-2                Seyfert 2 galaxy
     Symbiotic Star       symbiotic star
     T                    transient
     Z                    Z-track
     muQSO                micro-quasar
     Unclassified         unclassified
  

Class
The HEASARC Browse object classification based on the main part of the source_type parameter. The additional information provided in parentheses in the source_type parameter was not used for the HEASARC class, so the source_type parameter in more definitive.


Contact Person

Questions regarding the ISGRI4YRCT database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 19-Apr-2011