ACDS V10.0 - Detailed Description of IX/28A

ACDS V10.0 - Wed Dec 18 02:57:00 CET 2024

| # Detailed Description of IX/28A : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 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/28A           ROSAT HRI Pointed Observations (1RXH)     (ROSAT Team, 2000)
    ================================================================================
    The ROSAT Source Catalog of Pointed Observations with the
    High Resolution Imager (1RXH) (3rd Release)
         ROSAT Scientific Team
        <ROSAT NEWS No. 71, The ROSAT Consortium (*) (2000)>
        (*) Max-Planck-Institut fuer extraterrestrische Physik,
            Goddard Space Flight Center, Smithsonian Astrophysical Observatory
            Leicester University, Astrophysikalisches Institut Potsdam
    ================================================================================
    ADC_Keywords: X-ray sources ; Surveys

    Mission_Name: ROSAT

    Description:

        The hricat.dat table contains a list of sources detected by the
        Standard Analysis Software System (SASS) in reprocessed, public High
        Resolution Imager (HRI) datasets. In addition to the parameters
        returned by SASS (like position, count rate, signal-to-noise, etc.)
        each source in the table has associated with it a set of source and
        sequence "flags". These flags are provided by the ROSAT data centers
        in the US, Germany and the UK to help the user of the ROSHRI database
        judge the reliability of a given source.

        These data have been screened by ROSAT data centers in the US,
        Germany, and the UK as a step in the production of the Rosat Results
        Archive (RRA). The RRA contains extracted source and associated
        products with an indication of reliability for the primary parameters.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × hricat.dat       368   108514   ROSAT Source Catalog of Pointed Observations
                                      with the High Resolution Imager  (1RXH)
    × hrishort.dat     368    10861   ROSAT Source Catalog of Pointed Observations
                                      restricted to 'firm' detections  (1RXH-S)
    × seq.dat          174     4495   ROSAT observations used for the catalogue

    See also:
        IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS)
        IX/11 : ROSAT PSPC Source Catalog (1RXP)
        IX/12 : The WGACAT version of ROSAT sources (White+ 1995)
        http://www.xray.mpe.mpg.de/rosat/rra/roshri : the ROSHRI Home Page
        http://www.xray.mpe.mpg.de/rosat/doc/ruh : the ROSAT User Handbook
        http://heasarc.gsfc.nasa.gov/docs/rosat/rosdocs.html : the ROSAT
               User Handbook at HEASARC
        http://ledas-www.star.le.ac.uk/rosat/ : the UK ROSAT Public Data Archive

    Byte-by-byte Description of file:  hricat.dat  hrishort.dat

       Bytes Format Units   Label     Explanations

       1- 16  A16   ---     SeqDetec *Sequence Detection Name.
      20- 21  I2    ---     n_1RXH   *? Number of sources sharing a common 1RXH name
      23- 43  A21   ---     1RXH     *Name of catalogued detection
      45- 47  I3    arcsec  ErrPos    Total positional error
      49- 58  E10.3 ct/s    CRate     Estimate of net count rate
      60- 67  E8.2  ct/s    e_CRate   ?=0 Mean error on CRate
      69- 73  F5.1  ---     SNR       Signal-to-noise  ratio (truncated at 999.9)
      75- 76  I2    arcmin  offAxis   Off axis angle averaged over observation
      78- 83  I6    s       ExpTime   Exposure live time
          85  A1    ---     varFlag  *[NTP] Source variability
      88-100  A13   ---     SRCflags *[.cdefiu_mnpavw] Source flags
     102-109  A8    ---     SEQflags *[.DABEFMS_+]   Sequence flags
     111-116  A6   "YYMMDD" ChkDate   Date of sequence and source checking
     118-121  A4    ---     ChkSite   Checker Site (MPE, AIP, GSFC or SAO)
     123-126  A4    ---     ChkName   Checker ID
     128-132  A5    ---     Comment   Source comment
     136-141  A6   "YYMMDD" begDate   Observation start date
     143-148  A6   "YYMMDD" endDate   Observation finish date
     150-165  A16   ----    ObsID     Observation Identification
     167-170  A4    ---     Site      Processing site (MPE or USRS)
     174-181  F8.4  deg     RAdeg     Source Right Ascension (J2000)
     183-190  F8.4  deg     DEdeg     Source Declination (J2000)
     192-199  F8.4  deg     Glon      Galactic Longitude
     201-208  F8.4  deg     Glat      Galactic Latitude
     210-212  F3.1  ---     EPI      *[0,0.5] Edge Proximity Indicator
     214-219  F6.1  pix     Xpos      Unblocked x source position (0.5arcsec/pixel)
     221-226  F6.1  pix     Ypos      Unblocked y source position (0.5arcsec/pixel)
     228-233  F6.2  pix     imXpox    Blocked x source position (8arcsec/pixel)
     235-240  F6.2  pix     imYpox    Blocked y source position (8arcsec/pixel)
     242-247  F6.1  pix     lev1_X    SASS level 1 x coordinate (0.5arcsec/pixel)
     249-254  F6.1  pix     lev1_Y    SASS level 1 y coordinate (0.5arcsec/pixel)
     256-260  F5.1  arcsec cirRadius  Radius of source circle for source
                                        intensity measurement
     261-267  I7    ct     totCounts  Total (source + background) counts
                                        within cirRadius
     269-272  I4    ct   e_totCounts  Mean error on totCounts
     274-277  I4    ct     bkgCounts  Background counts inside cirRadius
     279-283  F5.3  ---     QE        1keV Quantum Efficiency
                                        which has been used to derive CRate
     285-289  F5.3  ---     vig       1keV vignetting correction for source
                                        which has been used to derive CRate
     291-295  F5.3  ---     csc       1keV scattering correction for source
                                        which has been used to derive CRate
     297-299  I3    arcsec  Xsize     X source detect cell size
     301-303  I3    arcsec  Ysize     Y source detect cell size
     305-311  I7    ct     boxCounts  Total counts in detection box
     313-316  I4    ct     thrCounts  Threshold for detection at this location
     318-321  F4.2  ---     unresPr  *[0,1] Probability the source is unresolved
     323-328  F6.1  pix     XposEC    X position of extended circle (0.5arcsec/pix)
     330-335  F6.1  pix     YposEC    Y position of extended circle (0.5arcsec/pix)
     337-342  F6.1  arcsec  RadEC     Radius of the extended circle
     345-350  F6.3  ---     SctEC     Extended circle scattering correction
                                            (truncated at 999.999)
     352-359  F8.2  ---     CorEC     Extended circle size correction
                                            (truncated at 99999.99)
     361-368  F8.2  ---     e_CorEC   Mean error on CorEC

    Note on SeqDetec:
        Unique name for detection, based on the observation sequence id and
        the number of the detection in the source list for that sequence.
    Note on 1RXH, n_1RXH:
        this name follows IAU conventions (based on J2000 position). Note that
        this name is NOT UNIQUE, detections with the same position sharing the
        same detection name; such detections may or may not represent the same
        astrophysical source. The column n_1RXH, if not blank, gives the
        number of sources sharing the same 1RXH name (the n_1RXH column was
        added at CDS)
    Note on varFlag: Source variability flag from SASS:
        N = Negative
        T = Too few observations
        P = Possible
    Note on SRCflags:
        The dot (.) indicates the absence of the flag.
        c = CONFUSED    (Close sources confused detection algorithm)
        d = DET_STRUCT  (Source near detector structure)
        e = EXTENDED    (Source extended, probably resolved)
        f = FALSE_DET   (Detection of unreal or false source)
        i = INTEN_SUSP  (Source brightness suspect)
        u = UN_UNIQUE   (source matched with another source which was
                         identified in a smaller detect cell)
        m = MULT_DET    (Complex emission split into individual sources)
        n = NOT_CHECKED (Weak source below SNR threshold used for checking)
        p = POS_SUSP    (Source position suspect)
        a = ASSOCIATED  (another source nearby may influence
                         derived source quantities)
        v = VARFLG_SUSP (Source variability indicator from SASS is suspect)
        w = WITHIN_EXT  (Source within extended emission)
    Note on SEQflags:
        The dot (.) indicates the absence of the flag.
        D = DEFERRED    (Field not flagged by operator)
            data screening not done
        A = ASP_SUSP    (Aspect solution suspect)
            obvious aspect problems, sources appear multiple or have
            obvious ellipticity
        B = BKG_SUSP    (Background suspect)
            Field background may be incorrect, due to inclusion of
            high background intervals or extended emission
        E = EXT_EMIS    (Extended emission in field)
            presence of extended emission over most of the field
        F = FIELD_FDET  (False detections in field)
            one or more detected sources deemed false
        M = SRC_MISS    (Sources in field missed)
        S = SLIS_MIS    (Source list missing)
            source list is missing, no sources detected by SASS or
            source detection stopped
        + = source is included in the Short Version, i.e. has the
            following flags not set (marked with a dot):
            SRCflags: f (FALSE_DET)  n (NOT_CHECKED)  u (UN_UNIQUE)
            SEQflags: D (DEFERRED)
            (the "+" flag was added at CDS)
    Note on EPI:
        The Edge Proximity Indicator indicates what fraction of the detect
        cell is corrupted by edges or hot spots; a zero means no edges or hot
        spots and 1.0 means complete obscuration.
    Note on unresPr:
        this number measures how well the radial distribution matches the
        expected probability function. A perfect match produces unresPr=1.0

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

       Bytes Format Units   Label     Explanations

       1- 24  A24   ---     DataFile  ROSAT Data File
      26- 29  A4    ---     ChkSite   Checker Site (AIP, GSFC, MPE or SAO)
      31- 34  A4    ---     ChkName   Checker ID
      36- 41  A6   "YYMMDD" ChkDate   Date of sequence and source checking
      43- 50  A8    ---     ChkVers   Checking version
      52- 59  A8    ---     SEQflags  [.DABEFMS_] Sequence flags (see the
                                       "Note on SEQflags" section above)
      61- 67  I7    s       ExpTime   Exposure live time
      70- 75  A6   "YYMMDD" begDate   Observation start date
      77- 82  A6   "YYMMDD" endDate   Observation finish date
      84- 87  I4    ---     Nsrc      Number of sources
      89- 91  I3    ---     ---       [0]
      93-103  A11   ---     error     Reason for skipping the qsrc file
     105-106  I2    ---     unRRA     [0] Number of RRA (ROSAT Result Archive) table
                                         columns which contain undefined values
                                         for any of the sources
         108  I1    ---     unkey1    [0] Number of undefined keywords from
                                         primary header
     110-111  I2    ---     unkey2    Number of undefined keywords from
                                         secondary header
     113-115  I3    ---     statSRCc  Number of sources with flag 'c' (CONFUSED)
     116-118  I3    ---     statSRCd  Number of sources with flag 'd' (DET_STRUCT)
     119-121  I3    ---     statSRCe  Number of sources with flag 'e' (EXTENDED)
     122-124  I3    ---     statSRCf  Number of sources with flag 'f' (FALSE_DET)
     125-127  I3    ---     statSRCi  Number of sources with flag 'i' (INTEN_SUSP)
     128-130  I3    ---     statSRCu  Number of sources with flag 'u' (UN_UNIQUE)
     131-133  I3    ---     ---       [0]
     134-136  I3    ---     statSRCm  Number of sources with flag 'm' (MULT_DET)
     137-139  I3    ---     statSRCn  Number of sources with flag 'n' (NOT_CHECKED)
     140-142  I3    ---     statSRCp  Number of sources with flag 'p' (POS_SUSP)
     143-145  I3    ---     statSRCa  Number of sources with flag 'a' (ASSOCIATED)
     146-148  I3    ---     statSRCv  Number of sources with flag 'v' (VARFLG_SUSP)
     149-151  I3    ---     statSRCw  Number of sources with flag 'w' (WITHIN_EXT)
     153-160  F8.4  deg     RAdeg     Pointing Right ascension (J2000)
     162-169  F8.4  deg     DEdeg     Pointing Declination (J2000)
     171-174  A4    ---     Site      Processing Site (MPE or USRS)

    History:
      * 05-Nov-1999:
        The files corresponding to the 2nd Release were copied from
        ftp.xray.mpe.mpg.de on 22-Aug-1999.
        This ReadMe file is essentially made from the ROSAT documentation
        available at the ROSHRI Home Page
        (http://wave.xray.mpe.mpg.de/rosat/rra/roshri).
        The columns 'n_1RXH' (indication of sources with name collisions) and
        the SEQflag "+" (indicating a source belonging to the short sample)
        were added at CDS.
      * 05-May-2000:
        The files corresponding to the 3rd Release were copied from
        ftp.xray.mpe.mpg.de, after revision.
        The same procedure as made on 05-Nov-1999 was applied to the new files.
      * 22-Jul-2008: New ROSAT URL : http://www.xray.mpe.mpg.de/rosat/rra/roshri/
    ================================================================================
    (End)                                     Francois Ochsenbein [CDS]  03-May-2000