ACDS V10.0 - Detailed Description of J/MNRAS/274/1165

ACDS V10.0 - Mon Feb 03 14:39:45 CET 2025

| # Detailed Description of J/MNRAS/274/1165 : The 2RE Source Catalogue (Pye+ 1995) |

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/MNRAS/274/1165       The  2RE Source Catalogue         (Pye+ 1995)
    ================================================================================
    The ROSAT Wide Field Camera all-sky survey of extreme-ultraviolet sources -
    II. The 2RE Source Catalogue
         Pye J.P., McGale P.A., Allan D.J., Barber C.R., Bertram D., Denby M.,
         Page C.G., Ricketts M.J., Stewart B.C., West R.G.
        <Mon. Not. R. Astron. Soc. 274, 1165 (1995)>
        =1995MNRAS.274.1165P      (SIMBAD/NED BibCode)
    ================================================================================
    ADC_Keywords: X-ray sources ; Extreme UV sources

    Mission_Name: ROSAT

    Keywords: space vehicles - catalogues - stars: late-type - white dwarfs -
              ultraviolet: general - X-rays: general.

    Description (Abstract):
        During 1990-1991 the Wide Field Camera (WFC) on the ROSAT satellite
        performed the first all-sky survey at EUV wavelengths. The survey was
        conducted in two 'colours' using broad-band filters to define
        wavebands covering the ranges 60-140A and 112-200A. It was fully
        imaging, with effective spatial resolution of about 3arcmin FWHM, and
        point source location accuracy of typically better than 1 arcmin. From
        an initial analysis, Pounds et al. published the WFC Bright Source
        Catalogue (BSC) of 383 sources. In this paper we report results from
        reprocessing of the complete survey database; the resulting list of
        sources is the '2RE' Catalogue. It contains 479 sources, of which 387
        are detected in both survey wavebands, a significant advance on the BSC
        (80 per cent versus 60 per cent). Improvements over the original BSC
        include: (i) better rejection of poor aspect periods, and smaller
        random errors in the aspect reconstruction; (ii) improved background
        screening; (iii) improved methods for source detection; (iv) inclusion
        of a time-variability test for each source; (v) more extensive
        investigation of the survey sensitivity. We define the catalogue
        selection criteria, and present the catalogue contents in terms of
        tables and sky maps. We also discuss the sky coverage, source
        number-flux relations, optical identifications and source variability.

    See also:
      ftp://ledas-ftp.star.le.ac.uk/rosat/2re/cat : the original file
      J/MNRAS/260/77 : the ROSAT-WFC Bright Source Catalogue (Pounds et al. 1993)
      J/A+AS/114/465 : the ROSAT XUV Pointed Phase Source Catalog
                         (Kreysing et al. 1995)
      II/203 : Second Extreme Ultra-Violet Explorer Catalog (1996)
      IX/10  : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges et al. 1996)

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × catalog.dat      195      479   The 2RE catalogue, Table 2 of paper
    × catalog.ps        72     2461   The 2RE catalog, PostScript version
    × notes.txt         80      323   Notes on individual 2RE sources

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

       Bytes Format Units   Label    Explanations

       1- 13  A13   ---     2RE      designation, based on the J2000 position.
          14  A1    ---     note     [*] indicates a note in file notes.txt
      16- 17  I2    h       RAh      Right Ascension J2000 (hours)
      19- 20  I2    min     RAm      Right Ascension J2000 (minutes)
      22- 26  F5.2  s       RAs      Right Ascension J2000 (seconds)
          29  A1    ---     DE-      Declination J2000 (sign)
      30- 31  I2    deg     DEd      Declination J2000 (degrees)
      33- 34  I2    arcmin  DEm      Declination J2000 (minutes)
      36- 39  F4.1  arcsec  DEs      Declination J2000 (seconds)
      41- 45  F5.1  arcsec  ErrPos   Position error, 90% confidence radius,
                                      due to counting statistics only.
      47- 52  F6.3  ct/s    S1       S1-band count rate (1)
      55- 59  F5.3  ct/s    e_S1     1 sigma error on S1-band count rate
      61- 66  F6.3  ct/s    S2       S2-band count rate (1)
      69- 73  F5.3  ct/s    e_S2     1 sigma error on S2-band count rate
      76- 80  F5.1  ---     Sig1     S1-band detection significance (2)
      83- 87  F5.1  ---     Sig2     S2-band detection significance (2)
      90- 94  F5.1  ---     Sigc     Combined detection significance (2)
          96  I1    ---     Detflag  [0/3] Detection flag (3)
          97  I1    ---   u_Detflag  [0/1] 1 indicates uncertainty (:) on Detflag
          99  I1    ---     VarFlag  [0/2] Variability flag (4)
     100-102  A3    ---     EUV      [EXW ] Previous reports as EUVE/X-ray source (5)
     104-119  A16   ---    OptName1  Name of possible optical counterpart.
     124-139  A16   ---    OptName2  Alternative name of possible optical counterpart
     144-159  A16   ---     SpType   Type of counterpart
     161-164  F4.1  mag     Vmag     Apparent magnitude of counterpart
     166-170  F5.1  arcsec  Dist     2RE-optical position difference
     172-178  A7    ---  r_OptName1  Originating catalogue for counterpart (6)
     179-182  A4    ---  q_OptName1  Quality of counterpart identification (7)
     184-185  A2    ---  n_OptName1  Notes about the possible counterpart (8)
     192-195  I4    ---     OClass   BROWSE database object class (4 digits).

    Note (1): The bands are
        S1 = 90-206eV   ( 60-140 Angstroems),  mean 125eV (100A)
        S2 = 62-110eV   (110-200 Angstroems),  mean  90eV (140A)
    Note (2): see section 3.5 of the paper for an accurate definition of
        the acceptance thresholds. The combined detection significance
        is        sqrt( sig1**2 + sig2**2 ).
    Note (3): see section 3.4 of the paper.
        1 = detection by PSS = Point Source Search program
        2 = detection by SESAME = Survey Event Source Analysis by
            Maximum-likelihood fitting
        3 = detection by PSS and SESAME
    Note (4): see section 3.7 of the paper; the variability flag takes the values
         0 = no variability claimed;
         1 = significant variability;
         2 = highly variable.
    Note (5):
         E = EUVE 1st Catalogue (Bowyer et al. 1994, Cat. J/ApJS/93/569)
         W = WFC-BSC (Pounds et al. 1993, Cat. J/MNRAS/260/77)
         X = X-ray, EINSTEIN IPC pointed and/or slew catalogues
                  (Harris et al. 1990; Plummer et al. 1991, CD-ROMs)
    Note (6): Extensive use was made of the SIMBAD data-base. The catalogues
            used are:
      CVR = List of cataclysmic variables compiled by the UK ROSAT CV
            special interest group in 1990
      MCK = McCook & Sion (1987) catalogue of spectroscopically identified
            white dwarf stars (Cat. III/129)
      SUB = Kilkenny, Heber & Drilling (1988, S. Afr. Astron. Obs. Circ. No 12, 1)
            catalogue of hot subdwarf stars.
      PUL = Lyne pulsar catalogue (e.g. Lyne et al. 1988) (Cat. VII/156)
      STR = Strassmeier et al. (1988) catalogue of chromospherically active
            binary stars (Cat. V/71).
      CNS = Gliese & Jahreiss (1991) catalogue of nearby stars,
            3rd edition, preliminary version (Cat. V/70).
      GCV = General catalogue of variable stars, 4th edition (Kholopov et al. 1988,
            Cat. II/139)
      YAL = Bright star catalogue, 5th revised edition, preliminary version
            (Hoffleit & Warren 1991, Cat. V/50).
      LHS = Luyten (1976) catalogue of stars with proper motions>0.5arcsec/yr
            (Cat. I/87)
      VER = Veron-Cetty & Veron (1989) catalogue of quasars and active galactic
            nuclei (Cat. VII/146).
      CAT = Soifer et al. (1984, ApJ 278, L271) catalogue of galaxies, a merger
            of various galaxy catalogues.
      MLN = Master hst of non-stellar objects (Dixon & Sonneborn 1980, Cat. VII/2).
      SIM = Compact version of SIMBAD database.
      MK  = Buscombe (1992, "General Catalogue of MK spectral classifications,
            volumes 7-10, Northwestern University, Evanston Illinois")
      HIC = Hipparcos input catalogue of stars (Turon et al. 1992, Cat. I/196)
      GSC = HST guide star catalogue (from CD-ROM version 1.1), Cat. I/220.
      W   = ROSAT-WFC Bright Source Catalogue (Pounds et al. 1993,
            Cat. J/MNRAS/260/77)
      E   = First EUVE source catalogue (Bowyer et al. 1994, Cat. J/ApJS/93/569).
      X   = Einstein IPC point source catalogues, from pointed and slew data
            (Harris et al. 1990; Plummer et al. 1991; CD-ROMs).
    Note (7): If this field is blank then any listed possible counterpart
        is simply based on positional coincidence, and care should be taken
        in using any such information.
        IDP+ = positive identification, either new, or confirming a catalogued
               object as the counterpart, resulting from the IDP
               (Mason et al. 1995, MNRAS 274, 1194)
        ID** = positive identification, based on the properties of the object,
               either from the existing literature or from follow-up
               observations other than the IDP, e.g.
               RS CVn system, or DA white dwarf
        ID*  = probable identification, e.g. poorly studied dMe star
    Note (8): the following symbols are used:
        RS = (RS CVn-type) (chromospherically/coronally active binaries)
        BY = (BY Dra-type) (chromospherically/coronally active binaries)
        W  = (W UMa-type)  contact binaries
        A  = indicates other active stars

    Historical Notes:
      * 20-Jul-1995: The catalogue was copied in July 1995 via anonymous ftp
            at: ledas-ftp.star.le.ac.uk
        and the catalogue file originally named 2re_table.txt
        was documented according to the CDS Documentation Standards.
        The notes were converted from the full-paper postscript file (2re_text.ps)
      * 21-Jan-1998: the flag "note" in byte 14 indicating the existence of
        a note was added at CDS.
    ================================================================================
    (End)                                    Francois Ochsenbein [CDS]   21-Jan-1998