Browse
this table...

MAXIGSCHGL - First MAXI/GSC High Galactic-Latitude Source Catalog

 HEASARC
Archive

Overview

This table contains the first unbiased source catalog of the Japanese Monitor of All-sky X-ray Image (MAXI) mission at high Galactic latitudes positions (|b| > 10 degrees), produced from the first 7 months of data (2009 September 1 to 2010 March 31) of the Gas Slit Camera (GSC) in the 4-10 keV band. The authors have developed an analysis procedure to detect faint sources from the MAXI data, utilizing a maximum likelihood image fitting method, where the image response, background, and detailed observational conditions are taken into account. The catalog consists of 143 X-ray sources above the 7-sigma significance level with a limiting sensitivity of ~ 1.5 x 10-11 erg/cm2/s (1.2 milliCrab) in the 4-10 keV band. Among them, the authors have identified 38 Galactic/LMC/SMC objects, 48 galaxy clusters, 39 Seyfert galaxies, 12 blazars, and 1 galaxy. Four other sources are confused with multiple objects, and one remains unidentified. The log N - log S relation of extragalactic objects is in good agreement with the HEAO-1 A-2 result, although the list of the brightest AGNs in the entire sky has significantly changed since that produced 30 years ago.

Catalog Bibcode

2011PASJ...63S.677H

References

The first MAXI/GSC catalog in the high Galactic-latitude sky.
    Hiroi K., Ueda Y., Isobe N., Hayashida M., Eguchi S., Sugizaki M.,
    Kawai N., Tsunemi H., Matsuoka M., Mihara T., Yamaoka K., Ishikawa M.,
    Kimura M., Kitayama H., Kohama M., Matsumura T., Morii M., Nakagawa Y.E.,
    Nakahira S., Nakajima M., Negoro H., Serino M., Shidatsu M., Sootome T.,
    Sugimori K., Suwa F., Toizumi T., Tomida H., Tsuboi Y., Ueno S., Usui R.,
    Yamamoto T., Yamazaki K., Yoshida A.
   <Publ. Astron. Soc. Jap., 63, S677-S689 (2011)>
   =2011PASJ...63S.677H    (SIMBAD/NED BibCode)

Provenance

This table was created by the HEASARC in April 2012 based on CDS Catalog J/PASJ/63/S677 file table1.dat.

Parameters

Source_Number
This number, in order of increasing J2000.0 Right Acension, uniquely identifies each source in this catalog.

Name
The designated MAXI source name based on its J2000.0 position, e.g., 'MAXI JHHMM+DDd'.

RA
The best-fit Right Ascension of the MAXI source in the selected equinox. This was given in J2000.0 decimal degree coordinates to a precision of 0.1 degrees in the original table. The position error of MAXI sources is typically 0.4 degrees for 7-sigma sources at the 90% confidence level.

Dec
The best-fit Declination of the MAXI source in the selected equinox. This was given in J2000.0 decimal degree coordinates to a precision of 0.1 degrees in the original table. The position error of MAXI sources is typically 0.4 degrees for 7-sigma sources at the 90% confidence level.

LII
The best-fit Galactic Longitude of the MAXI source.

BII
The best-fit Galactic Latitude of the MAXI source.

Significance
The significance (number of sigma) of the MAXI GSC detection.

Flux
The MAXI/GSC flux in the 4 - 10 keV band, in erg s-1 cm-2, calculated from the count rate in Crab units (1 Crab = 1.21 x 10-8 erg s-1 cm-2), assuming a source spectral power-law photon index of 2.1.

Flux_Error
The 1-sigma statistical error in the MAXI/GSC flux in the 4 - 10 keV band, in erg s-1 cm-2.

Ctrpart_Name
The counterpart designation of the MAXI source. The authors used the catalogs and references listed in Table 2 of the reference paper to identify the MAXI sources, looking for matches within 3 sigmapos of the MAXI position, where sigmapos = sqrt [(sigmastat)2 + (sigmasys)2], sigmasys is the MAXI 1-sigma systematic error of 0.05 degreees and sigmastat is the MAXI 1-sigma statistical error. If no sources were found in these catalogs, the authors also refer to other catalogs. Ten MAXI sources were found to have no matching counterparts within 3 sigmapos and, in these cases, the authors identified the counterpart by individual inspection using NED and Simbad.

RA_Ctrpart
The Right Ascension of the counterpart in the selected equinox. This was given in J2000.0 decimal degree coordinates to a precision of 0.001 degrees in the original table.

Dec_Ctrpart
The Declination of the counterpart in the selected equinox. This was given in J2000.0 decimal degree coordinates to a precision of 0.001 degrees in the original table.

Object_Type
The object type classification of the source, using the following abbreviations: 

     Sy    = Seyfert galaxy
     LMXB  = low-mass X-ray binary
     HMXB  = high-mass X-ray binary
     Symb  = symbiotic star
     NS    = neutron star
     BHC   = black hole candidate
     CV    = cataclysmic variable
     ULX   = ultra-luminous X-ray source
     msPSR = millisecond pulsar

Redshift
The redshift of the source, given only for extragalactic objects. This was given to a widely varying precision (10-6 to 10-2) in the original table.

Alt_Names
Other designation(s) for the source.

Source_Flag
This parameter flags notes on specific sources, with the following coded meanings: 

     A = Identified by individual inspection since in the image fitting the
          position is unable to be determined due to significant source confusion
          with Perseus Cluster
     B = The data is extended compared with the PSF model
     C = Matsumura et al. (2011, ATel, 3308)
     D = Suzuki et al. (2010, ATel, 2401)
     E = Isobe et al. (2010PASJ, 62, L55)
     F = This source is likely to be contaminated by 1RXS J133344.4-231734 and
          TV Hya. ESO 509-IG66 has double nuclei with similar fluxes in the
          2-10keV band (Guainazzi et al. 2005, A&A, 429, L9). The redshift is
          adopted from Sekiguchi and Wolstencroft (1992, MNRAS, 255, 581).
     G = This source is possibly contaminated by V893 Sco and other nearby
          sources.

Class
The HEASARC Browse object classification, based on the object_type parameter value.

Contact Person

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

A service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysics Observatory (SAO)

Page Author: Browse Software Development Team
Last Modified: 10-Apr-2012