ACDS V10.0 - Detailed Description of VIII/81B

ACDS V10.0 - Sun Jan 19 07:05:10 CET 2025

| # Detailed Description of VIII/81B : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008) |

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.

    VIII/81B       Sydney University Molonglo Sky Survey (SUMSS V2.1)  (Mauch+ 2008)
    ================================================================================
    The Sydney University Molonglo Sky Survey (SUMSS, Version 2.1)
         Mauch T., Murphy T., Buttery H.J., Curran J., Hunstead R.W.,
         Piestrzynski B., Robertson J.G., Sadler E.M.
        <Mon. Not. R. Astron. Soc. 342, 1117 (2003); Version 2.1>
        =2003MNRAS.342.1117M
        =2013yCat.8081....0M
    ================================================================================
    ADC_Keywords: Radio sources ; Surveys ; Radio continuum

    Keywords: catalogues - surveys - methods: data analysis - radio continuum: ISM -
              Galaxy: general - galaxies: statistics - radio continuum: general

    Description:
        The Sydney University Molonglo Sky Survey (SUMSS) is carried out
        at 843MHz with the Molonglo Observatory Synthesis Telescope (MOST) in
        its upgraded wide-field capability. The survey consists of 4.3x4.3°
        mosaic images with 45x45''cosec{delta} resolution, covering 8000
        square degrees from -30 degrees declination southwards with |b|>10°.
        The survey resolution and sensitivity (1-sigma noise limit 1mJy) are
        well-matched to the NRAO VLA Sky Survey (NVSS) so that together NVSS
        and SUMSS provide a complete survey of the radio sky.

        The version 2.0 (08-Aug-2007) of the catalogue consists of 210412
        radio sources made by fitting elliptical gaussians in 633 SUMSS
        mosaics to a limiting peak brightness of 6mJy/beam at declination
        <-50°, and 10mJy/beam at declination >-50°. Positional
        accuracies are 1-2'' for sources with Sp>=20mJy/beam, and are always
        better than 10''. The internal flux density scale is accurate to 3%.
        Image artefacts have been classified using a decision tree, which
        correctly identifies and rejects spurious sources in over 96% of cases.

        See the SUMSS site at http://www.astrop.physics.usyd.edu.au/sumsscat/
        for details about all versions of the SUMSS, and an access to the
        mosaic images.

        The version 2.1 (from 2008-03-11) corrects a bug in 2.0 in which
        some bright (S>500 mJy) sources were missing from the catalogue.

    File Summary:

           FileName      Lrecl  Records   Explanations

    ×                   80        .   This file
    × ReadMe            80        .   This file
    × sumss212.dat     135   211050   The SUMSS Catalog, Version 2.1r (Feb-16-2012)

    See also:
        VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
        http://www.physics.usyd.edu.au/sifa/Main/SUMSS :  the SUMSS Home Page

    Byte-by-byte Description of file:  sumss212.dat

       Bytes Format Units   Label     Explanations

       1-  2  I2    h       RAh       Right Ascension J2000 (hours)
       4-  5  I2    min     RAm       Right Ascension J2000 (minutes)
       7- 11  F5.2  s       RAs       Right Ascension J2000 (seconds)
          14  A1    ---     DE-       Declination J2000 (sign)
      15- 16  I2    deg     DEd       Declination J2000 (degrees)
      18- 19  I2    arcmin  DEm       Declination J2000 (minutes)
      21- 25  F5.2  arcsec  DEs       Declination J2000 (seconds)
      27- 30  F4.1  arcsec  e_RAs     The uncertainty in Right Ascension (1)
      32- 35  F4.1  arcsec  e_DEs     The uncertainty  Declination
      39- 45  F7.1  mJy     Sp        Peak brightness at 843MHz (in mJy.beam-1)
      47- 52  F6.1  mJy     e_Sp      Uncertainty on Sp
      55- 62  F8.1  mJy     St        Total flux density at 843MHz
      64- 69  F6.1  mJy     e_St      Uncertainty on St
      72- 77  F6.1  arcsec  MajAxis   Fitted major axis
      79- 83  F5.1  arcsec  MinAxis   Fitted minor axis
      85- 89  F5.1  deg     PA        Fitted major axis position angle (N to E)
      92- 97  F6.1  arcsec  dMajAxis  Fitted major axis after deconvolution (2)
      99-103  F5.1  arcsec  dMinAxis  Fitted minor axis after deconvolution (2)
     105-109  F5.1  deg     dPA       ? Fitted major axis position angle
     112-119  A8    ---     Mosaic    Mosaic in which the source appears (3)
         121  I1    ---     Nm        Number of mosaics with the source (4)
     123-128  F6.1  pix     Xpos      Position of the source on quoted mosaic (4)
     130-135  F6.1  pix     Ypos      Position of the source on quoted mosaic (4)

    Note (1): positional uncertainties are calculated from the quadratic
        sum of the MOST calibration in Right Ascension (averaged 1.5'') and
        Declination (averaged 1.7'') using Equations (2) and (3) of the paper.
    Note (2): If the fitted major axis size exceeds the beam size by more
        than 2.33{sigma}({theta}M), the major axis size after deconvolution
        from the MOST beam is given in arcseconds.
    Note (3): The naming scheme for SUMSS mosaics is JHHMMMDD indicating the
        J2000 RA and Dec of the mosaic centre. The original mosaics are
        available online at http://www.astrop.physics.usyd.edu.au/mosaics.
        In the case of duplicate matches the mosaic name quoted is that used
        for the fit which is chosen to be included in the catalogue.
    Note (4): when the source appears in  more than one image, the source
        parameters are those of the most reliable fit.

    Nomenclature Notes:
        SUMSS sources should be referred by their truncated position
        SUMSS JHHMMSS-DDMMSS

    History (previous versions are in the "versions" subdirectory):
      * 31-Aug-2007: file 'sumss_v2.dat' (V2.0, 2007-08-08, 210412 sources)
                     (from http://www.astrop.physics.usyd.edu.au/sumsscat/)
      * 02-Apr-2008: file 'sumss2_1.dat' (V2.1, 2008-03-11, 211063 sources)
                     (from http://www.astrop.physics.usyd.edu.au/sumsscat/)
      * 27-Jun-2013: file 'sumss212.dat' (sumsscat.Feb-16-2012, 211050 sources)
                     (from http://www.astrop.physics.usyd.edu.au/sumsscat/)
    ================================================================================
    (End)                                   Francois Ochsenbein [CDS]    27-Jun-2013