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J/ApJS/143/25   Intermediate-luminosity X-ray objects catalog   (Colbert+, 2002)
A catalog of candidate intermediate-luminosity X-ray objects.
    Colbert E.J.M., Ptak A.F.
   <Astrophys. J. Suppl. Ser. 143, 25 (2002)>
   =2002ApJS..143...25C
ADC_Keywords: X-ray sources

Keywords: catalogs - galaxies: general - X-rays: binaries - X-rays: galaxies


Abstract:
    ROSAT, and now Chandra, X-ray images allow studies of extranuclear
    X-ray point sources in galaxies other than our own. X-ray observations
    of normal galaxies with ROSAT and Chandra have revealed that
    off-nuclear, compact, intermediate-luminosity
    (LX[2-10keV]≥1039erg/s) X-ray objects (IXOs, a.k.a. ULXs
    [ultraluminous X-ray sources]) are quite common. Here we present a
    catalog and finding charts for 87 IXOs in 54 galaxies, derived from
    all of the ROSAT HRI imaging data for galaxies with cz≤5000km/s from
    the Third Reference Catalog of Bright Galaxies.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1.dat        75       87   ROSAT HRI IXO catalog
table2.dat        46      169   ROSAT HRI Detections of IXOs


See also:
          VII/155 : Third Reference Cat. of Bright Galaxies (RC3) 
                                                      (de Vaucouleurs+ 1991)
          IX/28   : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)
  J/MNRAS/344/134 : Chandra ultraluminous X-ray sources (Humphrey+, 2003)
  J/A+A/429/1125  : Ultraluminous X-ray sources catalog (Liu+, 2005)


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

   Bytes Format Units   Label     Explanations

   1-  2  I2    ---     IXO       Intermediate-luminosity X-ray Object number
   4-  5  I2    h       RAh       Hour of Right Ascension (J2000) (1)
   7-  8  I2    min     RAm       Minute of Right Ascension (J2000) (1)
  10- 13  F4.1  s       RAs       Second of Right Ascension (J2000) (1)
      15  A1    ---     DE-       Sign of the Declination (J2000) (1)
  16- 17  I2    deg     DEd       Degree of Declination (J2000) (1)
  19- 20  I2    arcmin  DEm       Arcminute of Declination (J2000) (1)
  22- 23  I2    arcsec  DEs       Arcsecond of Declination (J2000) (1)
  25- 28  F4.1  [10-7W] logLX     Log of the maximum 2-10 keV X-ray luminosity
                                   in units of erg/s (2)
  30- 40  A11   ---     GName     Galaxy Name
  42- 46  F5.1  ---     T-type    Host galaxy type from RC3 (3)
  48- 51  F4.1  ---     A-type    ? The AGN type (4)
  53- 56  F4.1  [---]   logFIR/B  ? Log of the FIR to B-band flux (5)
  58- 62  F5.2  Mpc     Dist      Distance
      64  I1    ---     r_Dist    Distance reference (6)
  66- 69  F4.1  kpc     Rad       Radius from nucleus (7)
  71- 74  F4.1  kpc     RMax      Maximum radius allowed for inclusion (8)

Note (1): X-ray position from ROSAT HRI data.

Note (2): Calculated from the ROSAT HRI count rate assuming a power-law spectrum
           with Γ=1.7 (N(E)∝E^-Γ, N(E) in ph/keV/cm2/s)
           and the Galactic hydrogen column from Table 2. We note that while a
           soft X-ray luminosity (e.g., 0.2-2.4keV) is better matched to the
           ROSAT HRI instrument than a hard 2-10keV luminosity, the latter is
           better matched to current missions, such as CHANDRA and XMM.
           For Γ=1.7, the 0.2-2.4keV unabsorbed luminosity is a factor of
           0.89 times the 2-10keV luminosity listed here.
Note (3):  Negative for E galaxies and positive for S galaxies.

Note (4): -1 means normal galaxy.

Note (5): FIR flux determined from IRAS measurements using the method of
           Fullmer & Lonsdale (1989IRASG....c....F). B-band fluxes were
           extracted from NED.
Note (6): Distance reference:
           1 = Assuming H0 is 75km/s/Mpc using recessional velocities
                listed in RC3, Cat. VII/155;
           2 = Nearby Galaxies Catalog, Tully (1988, Cat. VII/118);
           3 = Paturel et al. (2002, Cat. J/A+A/383/398);
Note (7): Which was assumed to be at the RC3, Cat. VII/155, optical position.

Note (8): Equal to the 25mag/arcsec2 diameter from RC3, Cat. VII/155.



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

   Bytes Format Units     Label   Explanations

   1-  2  I2    ---       IXO     Intermediate-luminosity X-ray Object number
   4- 15  A12   ---       DNum    The archive dataset number
      16  A1    ---       f_DNum  [*] Flag on DNum (1)
  18- 23  F6.2  10-3ct/s  CRate   ? HRI count rate
  25- 28  F4.2  10-3ct/s e_CRate  ? Error in CRate (2)
  30- 34  F5.1  ---       Sig     ? Significance of detection (3)
  36- 39  F4.1  [cm-2]    NH      ? Galactic hydrogen absorption column (4)
  41- 45  F5.2  10+32W    LX      ? The 2-10keV X-ray luminosity in units of
                                     1039erg/s (5)

Note (1): * = Dataset name used for contour plot in Figures 1-15.

Note (2): From Gaussian plus sloping background model fits.

Note (3): Number of source counts divided by the square root of the number of
           background counts in the source detection cell.
Note (4): From the FTOOLS NH program (Dickey & Lockman, 1990ARA&A..28..215D).

Note (5): Estimated from the ROSAT HRI count rate and assuming a power-law
           spectrum with Γ=1.7 and NH.


History:
    From electronic version of the journal
(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    19-Nov-2002