ACDS V10.0 - Detailed Description of J/ApJS/238/32

ACDS V10.0 - Wed Dec 18 01:40:00 CET 2024

| # Detailed Description of J/ApJS/238/32 : 3rd MAXI/GSC X-ray cat at high Galactic latitude (Kawamuro+, 2018) |

Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.

    J/ApJS/238/32 3rd MAXI/GSC X-ray cat at high Galactic latitude (Kawamuro+, 2018)
    ================================================================================
    The 7-year MAXI/GSC X-ray source catalog in the high Galactic latitude sky
    (3MAXI).
        Kawamuro T., Ueda Y., Shidatsu M., Hori T., Morii M., Nakahira S., Isobe N.,
        Kawai N., Mihara T., Matsuoka M., Morita T., Nakajima M., Negoro H., Oda S.,
        Sakamoto T., Serino M., Sugizaki M., Tanimoto A., Tomida H., Tsuboi Y.,
        Tsunemi H., Ueno S., Yamaoka K., Yamada S., Yoshida A., Iwakiri W.,
        Kawakubo Y., Sugawara Y., Sugita S., Tachibana Y., Yoshii T.
       <Astrophys. J. Suppl. Ser., 238, 32 (2018)>
       =2018ApJS..238...32K
    ================================================================================
    ADC_Keywords: X-ray sources ; Redshifts ; Cross identifications;
                  Clusters, galaxy; Active gal. nuclei
    Keywords: catalogs ; galaxies: active ; galaxies: clusters: general ; surveys ;
              X-rays: galaxies

    Abstract:
        We present the third MAXI/GSC catalog in the high Galactic latitude
        sky (|b|>10°) based on the 7-year data from 2009 August 13 to 2016
        July 31, complementary to that in the low Galactic latitude sky
        (|b|<10°) (Hori+ 2018ApJS..235....7H). We compile 682 sources
        detected at significances of sD,4-10keV>=6.5 in the 4-10keV band. A
        two-dimensional image fit based on the Poisson likelihood algorithm
        (C-statistics) is adopted for the detections and constraints on their
        fluxes and positions. The 4-10keV sensitivity reaches ~0.48mCrab, or
        ~5.9x10-12erg/cm2/s, over half of the survey area. Compared with
        the 37-month Hiroi+ (2013, J/ApJS/207/36) catalog, which adopted a
        threshold of sD,4-10keV>=7, the source number increases by a factor
        of ~1.4. The fluxes in the 3-4keV and 10-20keV bands are further
        estimated, and hardness ratios (HRs) are calculated using the 3-4keV,
        4-10keV, 3-10keV, and 10-20keV band fluxes. We also make the 4-10keV
        light curves in 1-year bins for all the sources and characterize their
        variabilities with an index based on a likelihood function and the
        excess variance. Possible counterparts are found from five major X-ray
        survey catalogs by Swift, Uhuru, RXTE, XMM-Newton, and ROSAT, as well
        as an X-ray galaxy cluster catalog (MCXC). Our catalog provides the
        fluxes, positions, detection significances, HRs, 1-year bin light
        curves, variability indices, and counterpart candidates.

    Description:
        We analyze the Monitor of All-sky X-ray Image (MAXI)/Gas Slit Camera
        (GSC) event data from 2009 August 13 to 2016 July 31 provided by
        RIKEN, focusing on those at high Galactic latitudes (|b|>10°). The
        same data-screening criteria as adopted by Hori+ (2018ApJS..235....7H
        -- see their Section 2) are applied.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table1.dat       177      682   X-ray properties of sources in the third MAXI/GSC
                                  catalog
    × table2.dat       113      682   Possible counterparts in the third MAXI/GSC catalog
    × table3.dat       139        4   Properties of transient events
    × lc3maxi.dat       65     5456   Data behind Appendix Figure A -- Lightcurves
                                  in the 4-10keV band
    × lct3maxi.dat      65       32   Data behind Appendix Figure B -- Lightcurves
                                  in the 4-10keV band of 4 transient objects
                                  detected from data binned in each year

    See also:
     IX/4  : Fourth UHURU Catalogue (4U) (Forman+ 1978)
     IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
     J/PASJ/63/S677 : MAXI/GSC catalog in high Galactic-latitude sky (Hiroi+, 2011)
     J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)
     J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
     J/ApJS/207/19 : Hard X-ray survey from Swift-BAT 2004-2010 (Baumgartner+, 2013)
     J/ApJS/207/36 : 2nd MAXI/GSC cat. in high galactic-latitude sky (Hiroi+, 2013)
     J/ApJ/814/11  : Obscured AGNs from XMM-Newton and AKARI (Terashima+, 2015)
     J/PASJ/68/S32 : MAXI/SSC catalog of X-ray sources in 0.7-7.0keV (Tomida+, 2016)
     J/ApJS/235/4  : The 105-month Swift-BAT all-sky hard X-ray survey (Oh+, 2018)

    Byte-by-byte Description of file:  table1.dat

       Bytes Format Units        Label     Explanations

       1-  3  I3    ---          Seq       [1/682] Source number
       5- 13  A9    ---          3MAXI     MAXI name (JHHMM+DDd)
      15- 21  F7.3  deg          RAdeg     Right ascension (J2000)
      23- 29  F7.3  deg          DEdeg     Declination (J2000)
      31- 35  F5.3  deg          ePos      [0/0.6] 1sigma statistical error of
                                            the position
      37- 42  F6.1  ---          s4-10keV  [6.5/9847] 4-10keV detection significance
      44- 52  F9.2  10-12mW/m2   F4-10keV  [4.3/181920] 4-10keV flux
      54- 58  F5.2  10-12mW/m2 e_F4-10keV  [0.6/18.5] Error of the 4-10keV flux
      60- 66  F7.2  ---          s3-4keV   [0/6259]? 3-4keV detection significance
      68- 75  F8.2  10-12mW/m2   F3-4keV   [0.1/53114] 3-4 keV flux
          77  A1    --          l_F3-4keV  Limit flag on Flux34 (1)
      79- 82  F4.2  10-12mW/m2  e_F3-4keV  [0.2/8.5] Error of the 3-4keV flux (1)
      84- 90  F7.2  ---         s10-20keV  [0/3557]? 10-20keV detection significance
      92- 99  F8.2  10-12mW/m2  F10-20keV  [0/68876] 10-20keV flux
         101  A1    --        l_F10-20keV  Limit flag on Flux1020 (1)
     102-106  F5.2  10-12mW/m2 e_F10-20keV  [1/20] Error of the 10-20keV flux (1)
     108-116  F9.2  10-12mW/m2   F3-10keV  [5/235034] 3-10keV flux
     118-122  F5.2  10-12mW/m2 e_F3-10keV  [0.7/20.3] Error of the 3-10keV flux
     124-128  F5.2  ---          HR1       [-0.4/0.9] Hardness ratio,
                                            3-4keV and 4-10keV fluxes
     130-133  F4.2  ---          e_HR1     [0/0.2] Error of HR1
     135-139  F5.2  ---          HR2       [-1/0.6] Hardness ratio,
                                            4-10keV and 10-20keV fluxes
     141-144  F4.2  ---          e_HR2     [0/1.8] Error of HR2
     146-150  F5.2  ---          HR3       [-1/0.7] Hardness ratio,
                                            3-10keV and 10-20keV fluxes
     152-155  F4.2  ---          e_HR3     [0/2] Error of HR3
     157-164  F8.2  ---          TSVar     [0.8/12714] Time variability index
     166-171  F6.3  ---          XVA       [-0.2/7] Excess variance
     173-177  F5.3  ---          e_XVA     [0/0.5] Error of the excess variance

    Note (1): When a 1sigma error is larger than the best-fit value, the 1sigma
        upper limit is represented.

    Byte-by-byte Description of file:  table2.dat

       Bytes Format Units Label   Explanations

       1-  3  I3    ---   Seq     [1/682] Source number
       5- 13  A9    ---   3MAXI   MAXI name (JHHMM+DDd)
      15- 39  A25   ---   Name    Counterpart name
      41- 50  F10.6 deg   RACdeg  ? Counterpart Right Ascension (J2000)
      52- 61  F10.6 deg   DECdeg  ? Counterpart Declination (J2000)
      63- 71  F9.6  ---   z       [-0.0006/2.7]? Counterpart redshift
      73- 99  A27   ---   Type    Counterpart source type
     101-109  A9    ---   Flag    Cross-matching flag(s) (2)
     111-113  A3    ---   Note    Note (3)

    Note (2): Cross-matching flag represents that the source has more than one
        counterpart. Flag as follow:
      B = the Swift/BAT 105-month catalog (BAT105; Oh+ 2018, J/ApJS/235/4);
      U = the Uhuru fourth catalog (4U; Forman+ 1978, IX/4);
      X = the RXTE All-Sky Monitor long-term observed source table (XTEASMLONG --
           http://heasarc.gsfc.nasa.gov/W3Browse/xte/xteasmlong.html);
      M = Meta-Catalog of X-Ray Detected Clusters of Galaxies (MCXC;
           Piffaretti+ 2011, J/A+A/534/A109);
      N = the XMM-Newton slew survey catalog (XMMSL2 --
           http://www.cosmos.esa.int/web/xmm-newton/xmmsl2-ug);
      R = the ROSAT all-sky survey bright source catalog (1RXS; Voges+ 1999, IX/10).
    Note (3): Note related to the identification of the counterpart as follows:
      A = The auto-matching identifies a galaxy cluster, but this is likely
           inconsistent with the significant variability (TSvar=87). Then,
           we select a star as a plausible candidate of the counterpart.
      B = We automatically find an obscured AGN from BAT105 as the
           counterpart, but the very soft property is not so common to such
           objects. Then, we find a bright object, CXO J092418.2-314217, in a
           Swift/XRT soft X-ray image. According to a study by Tomsick+
           (2017ApJS..230...25T), it can be classified as the LMXB or the CV,
           and here we representatively adopt the LMXB.
      C = One of the brightest galaxies is selected for the most plausible
           counterpart.

    Byte-by-byte Description of file:  table3.dat

       Bytes Format Units       Label    Explanations

           1  I1    ---         Seq      [1/4] Running sequence number
       3- 11  A9    ---         3MAXIt   MAXI name (JHHMM+DDd)
      13- 19  F7.3  deg         RAdeg    Right ascension in decimal degrees (J2000)
      21- 27  F7.3  deg         DEdeg    Declination in decimal degrees (J2000)
      29- 33  F5.3  deg         ePos     [0.06/0.2] 1sigma statistical error of the
                                          position
      35- 38  F4.1  ---        s4-10keV  [9/21] 4-10keV detection significance
      40- 43  F4.1  10-15W/m2  F4-10keV  [18/73] 4-10keV flux
      45- 47  F3.1  10-15W/m2 e_F4-10keV  [1/4] Error of the 4-10keV flux
      49- 56  F8.3  ---         TSVar    [367/3487] Time variability index
      58- 62  F5.3  ---         XVA      [3.2/5.8] Excess variance {sigma}2rms
      64- 68  F5.3  ---         e_XVA    [0.3/0.9] XVA uncertainty
      70- 87  A18   ---         Name     Counterpart name
      89- 95  F7.3  deg         RACdeg   Counterpart right ascension (J2000)
      97-103  F7.3  deg         DECdeg   Counterpart declination (J2000)
     105-112  F8.6  ---         z        [0.00411]? Counterpart redshift
     114-139  A26   ---         Type     Counterpart type

    Byte-by-byte Description of file:  lc3maxi.dat

       Bytes Format Units   Label     Explanations

       1-  7  A7    ---     ---       [3MAXI_ ]
       8- 16  A9    ---     3MAXI     MAXI name (JHHMM+DDd)
      18- 21  I4    yr      Year      [2009/2016] Observation, Year
      23- 29  F7.1  d       MJD       Observation, Modified Julian Date
      31- 35  I5    d       MJDSt     Start, Modified Julian Date
      37- 41  I5    d       MJDEnd    End, Modified Julian Date
      43- 53  E11.6 Crab    Flux      [0/16] Flux, units of Crab
      55- 65  E11.6 Crab    e_Flux    [1.6e-05/0.3] Error in Flux, units of Crab

    Byte-by-byte Description of file:  lct3maxi.dat

       Bytes Format Units   Label     Explanations

       1-  7  A7    ---     ---       [3MAXIt_]
       8- 16  A9    ---     3MAXIt    MAXI name (JHHMM+DDd)
      18- 21  I4    yr      Year      [2009/2016] Observation, Year
      23- 29  F7.1  d       MJD       Observation, Modified Julian Date
      31- 35  I5    d       MJDSt     Start, Modified Julian Date
      37- 41  I5    d       MJDEnd    End, Modified Julian Date
      43- 53  E11.6 Crab    Flux      [0/16] Flux, units of Crab
      55- 65  E11.6 Crab    e_Flux    [1.6e-05/0.3] Error in Flux, units of Crab

    History:
        From electronic version of the journal
    ================================================================================
    (End)                     Prepared by [AAS], Emmanuelle Perret [CDS] 30-Nov-2018