ACDS V10.0 - Detailed Description of IX/32

ACDS V10.0 - Sun Jan 19 07:11:04 CET 2025

| # Detailed Description of IX/32 : ROSAT Bright Survey (Fischer+, 1998-2000) |

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.

    IX/32                  ROSAT Bright Survey                 (Fischer+, 1998-2000)
    ================================================================================
    The ROSAT Bright Survey.
    I. Identification of an AGN sample with hard ROSAT X-ray spectra
    II. Catalogue of all high-galactic latitude RASS sources with PSPC
    countrate CR>0.2s-1.
         Fischer J.-U., Hasinger G., Schwope A.D., Brunner H., Boller T.,
         Trumper J., Voges W., Neizvestny S., Schwarz R., Ugryumov A., Belage Yu.
        <Astron. Nachrichten 319, 347 (1998); 321, 1 (2000)>
        =1998AN....319..347F
        =2000AN....321....1S
    ================================================================================
    ADC_Keywords: Surveys ; X-ray sources ; Active gal. nuclei

    Mission_Name: ROSAT

    Keywords: AGN - interacting galaxies - surveys: X-rays - surveys: AGN

    Description:
        The ROSAT Bright Survey (RBS, table "rosat.dat") aims to completely
        optically identify the 2072 brightest sources detected in the ROSAT
        all-sky survey (Cat. IX/10) at galactic latitudes |b|>30°
        (excluding LMC, SMC, Virgo cluster), with countrate above 0.2s-1;
        this program is 99.5% complete, and a sub-sample of 931 sources with
        countrate above 0.2s-1 in the hard spectral band between 0.5 and
        2.0keV is 100% identified. The total survey area comprises
        20391°2 at a flux limit of 2.4x10-12erg/cm2/s in the
        0.5-2.0keV band.

        Tables 1 and 3 examine the "RHS" sub-sample of 66 bright point-like
        ROSAT survey sources with almost hard PSPC spectra (hardness ratio
        HR1>0.5) which could be nearly completely identified by low-resolution
        optical spectroscopy with the following breakdown into object classes:
        31 Seyfert galaxies (20 Sy1), 22 BL Lac candidates, 5 clusters of
        galaxies, 1 cataclysmic variable, and 5 bright stars. Only one object
        remained unidentified and one X-ray source was a spurious detection.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × table1.dat        70       65   List of X-ray sources forming the
                                  ROSAT Hard Survey, RHS
    × table3.dat        75       64   Summary of the optical identification program
                                  of the new sources in the RHS-sample.
    × note3.dat         84       33   Notes from table3.dat
    × rosat.dat        151     2072   The ROSAT Bright Survey (RBS) catalogue
    × notes.dat         80      283   Individual notes of rosat.dat file

    See also:
         IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)

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

       Bytes Format Units    Label    Explanations

       1-  2  I2    ---      RHS      ROSAT Hard Survey sequential number
       4-  7  I4    ---      RBS      ? ROSAT Bright Survey sequential number
       9- 23  A15   ---      1RXSJ    1RXSJ (Cat. IX/10) designation
      25- 26  I2    h        RAh      X-ray right ascension (J2000)
      28- 29  I2    min      RAm      X-ray right ascension (J2000)
      31- 34  F4.1  s        RAs      X-ray right ascension (J2000)
          36  A1    ---      DE-      X-ray declination sign (J2000)
      37- 38  I2    deg      DEd      X-ray declination (J2000)
      40- 41  I2    arcmin   DEm      X-ray declination (J2000)
      43- 44  I2    arcsec   DEs      X-ray declination (J2000)
          46  A1    ---      D        [PH] Detector (P: PSPC, H: HRI)
      48- 49  I2    arcsec   e_Pos    X-ray positional uncertainty
      51- 54  F4.2  ct/s     CRate    Count rate (1)
      56- 59  F4.2  ct/s     e_CRate  rms uncertainty on CRate
      61- 65  F5.2  ---      HR1      Hardness ratio 1 (1)
      67- 70  F4.2  ---      e_HR1    rms uncertainty on HR1

    Note (1): X-ray count rates and hardness ratios are derived from the
        All-Sky Survey Bright Source Catalogue (1RXS, Voges et al., 1996, Cat.
        <IX/10), with the exception of RHS10, where the SASS1-processed survey
        data are used.
             HR1=(H+S)/(H-S)  with the ROSAT-PSC count rates
        H in the hard band (0.5-2.0keV) and S in the soft band (0.1-0.4keV).

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

       Bytes Format Units     Label    Explanations

       1-  2  I2    ---       RHS      RHS number
       5-  6  I2    h         RAh      Optical right ascension (J2000)
       8-  9  I2    min       RAm      Optical right ascension (J2000)
      11- 14  F4.1  s         RAs      Optical right ascension (J2000)
          16  A1    ---       DE-      Optical declination sign (J2000)
      17- 18  I2    deg       DEd      Optical declination (J2000)
      20- 21  I2    arcmin    DEm      Optical declination (J2000)
      23- 24  I2    arcsec    DEs      Optical declination (J2000)
      27- 28  I2    arcsec    Dox      Positional difference between the optical
                                        and X-ray coordinates
      32- 35  A4    ---       Class    Classification of the object
      38- 46  A9    ---       Type     Type of the object
      48- 52  F5.3  ---       z        ? Redshift
      55- 58  F4.1  mag       Vmag     Optical brightness
      60- 63  F4.1  10-15W/m2 FX       Integrated X-ray flux between 0.5 and 2.0keV
      65- 70  F6.1  mJy       Fr       ? Radio flux at 1.4GHz
      72- 75  A4    ---       Notes    Notes detailed in note3.dat

    Byte-by-byte Description of file:  note3.dat

       Bytes Format Units   Label     Explanations

       1-  2  A2    ---     Note      Note designation in table3.dat
           3  A1    ---     ---       [:]
       5- 84  A80   ---     Text      Text of note

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

       Bytes Format Units   Label     Explanations

       1-  4  I4    ---     RBS       ROSAT Bright Survey number
       6- 20  A15   ---     1RXSJ     1RXSJ X-ray coordinates (Cat. IX/10)
      22- 23  I2    h       RAh       ? Optical right ascension (J2000)
      25- 26  I2    min     RAm       ? Optical right ascension (J2000)
      28- 31  F4.1  s       RAs       ? Optical right ascension (J2000)
          33  A1    ---     DE-       Optical declination sign (J2000)
      34- 35  I2    deg     DEd       ? Optical declination (J2000)
      37- 38  I2    arcmin  DEm       ? Optical declination (J2000)
      40- 41  I2    arcsec  DEs       ? Optical declination (J2000)
      43- 45  I3    arcsec  Dist      ? Distance optical minus X positions
      48- 50  I3    arcsec  e_Pos     X-ray positional uncertainty (1{sigma}) as
                                      given in the 1RXS-catalog. The 90% confidence
                                      error radius is r90=1.65{sigma}
      52- 56  F5.2  ct/s    CR        RASS countrate in the total ROSAT
                                      window 0.1-2.4keV
      58- 62  F5.2  ct/s    CRH       RASS countrate in the hard ROSAT
                                      window 0.5-2.0keV
      64- 68  F5.2  ---     HR1       hardness ratio (1)
      70- 74  F5.2  ---     HR2       hardness ratio (1)
      76- 80  F5.2 10+20cm-2 NH       Galactic hydrogen column density
      82- 91  A10   ---     Name      (Truncated) Name in optical catalogues
      93- 97  A5    ----    XClass    Class of X-ray source (2)
      99-108  A10   ---     Type      Type within class (2)
     110-115  F6.4  ---     z         ? redshift
         116  A1    ---     u_z       Uncertainy flag on z
         118  A1    ---     l_Mag     Limit flag on Mag
     119-122  F4.1  mag     Mag       ? Optical brightness (typically in the V-band,
                                        sometimes only through spectrograph slit
         123  A1    ---     u_Mag     Uncertainty flag on Mag
         124  A1    ---     n_Mag     [CSNBDRE] Band and origin of magnitude (3)
     126-130  I5  10-17W/m2 FX        Flux in ROSAT X-ray band
     131-136  F6.2  ---     logFX/Fo  ? log flux ratio X-ray to optical
     137-141  F5.1  10-7W   logLX     ? log of X-ray luminosity
         143  A1    ---     Note      [Y] Y: Note detailed in notes.dat file

    Note (1): Hardness ratio:
         HR1=(H+S)/(H-S)   with H and S being the counts in the hard (0.5-2.0keV)
                           and the soft (0.1-0.4keV) spectral bands, respectively.
         HR2=(D-C)/(D+C)   with D and C being the count in the (0.9-2.0keV)
                           and the (0.5-0.9keV) spectral bands, respectively.
    Note (2): A column indicates an uncertain identification.
         AGN: active galactic nucleus, X-rays originate from the central engine
       GALAX: normal galaxy without obvious nuclear activity. X-rays originate
              predominantly from the stellar constituents of the galaxy
       CLUST: cluster of galaxies
        GGRP: small (compact) group of galaxies
        STAR: coronal or photospheric emitter of X-rays
          CV: cataclysmic variable or related object (white dwarf accretor)
         XRB: X-ray binary (neutron star or black hole accretor)
          MC: Magellanic cloud source, not considered in the identification program
       VIRGO: X-ray source in the Virgo region, not considered in the
              identification program
    Note (3): Origin of magnitude:
         C: CDS/SIMBAD (V band)
         D: CDS/SIMBAD (D band)
         N: NED (a magnitude in the optical range)
         R: APM/ROE scan of POSS/ESO/SERC red (E) plate
         B: APM/ROE scan of POSS/ESO/SERC blue (O) plate
         S: below slit magnitude determined by folding a low-resolution
             spectrum with the sensitivity curve of a V-filter
         E: not specified

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

       Bytes Format Units   Label     Explanations

       1-  4  I4    ---     RBS       RBS number
       6- 80  A75   ---     Note      Text of the note

    Acknowledgements: A. Schowpe aschwope@aip.de

    ================================================================================
    (End)                          James Marcout, Patricia Bauer [CDS]  22-Jan-2002