SUMSS - Sydney University Molonglo Sky Survey (SUMSS) Source Catalog
Sources were found by fitting two-dimensional Gaussians to SUMSS mosaics. Positions in the catalog are accurate to within 1-2" for sources with peak brightness >= 20 mJy/beam, and are always better than 10". The internal flux density scale is accurate to within 3%. Image artifacts were classified using a decision tree, which correctly identified and rejected spurious sources in over 96% of cases. Analysis of the catalog shows that it is highly uniform and is complete to 8 mJy at delta <= -50 degrees, and to 18 mJy at delta > -50 degrees.
SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. I. Science Goals, Survey Design, and Instrumentation Bock, D. C.-J., Large, M. I., Sadler, E. M. 1999, AJ, Volume 117, p. 1578 (1999AJ....117.1578B) SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. II. The Source Catalogue Mauch, T., Murphy, T., Buttery, H. J., Curran, J., Hunstead, R. W., Piestrzynski, B., Robertson, J. G., Sadler, E. M. 2003, MNRAS, Volume 342, p. 1117 (2003MNRAS.342.1117M) The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue Murphy, T., Mauch, T., Green, A., Hunstead, R. W., Piestrzynski, B., Kels, A.P., Sztajer, P. 2007, MNRAS, in press
The SUMSS source designation, created by the HEASARC from the J2000 coordinates using the IAU-recommended position-based method and the prefix "SUMSS" and according to the prescription given in SUMSS II.
The Right Ascension of the source in the selected equinox. This was given in J2000 coordinates to a precision of 0.01 seconds of time in the original table.
The Declination of the source in the selected equinox. This was given in J2000 coordinates to a precision of 0.1 arcseconds in the original table.
The Galactic Longitude of the source.
The Galactic Latitude of the source.
The uncertainty in the Right Ascension of the source, in arcseconds, calculated from the quadratic sum of the MOST Right Ascension calibration uncertainty (1.5") and equation 2 of the catalog paper (SUMSS II: Mauch et al. 2003).
The uncertainty in the Declination of the source, in arcseconds, calculated from the quadratic sum of the MOST Declination calibration uncertainty (1.7") and equation 3 of the catalog paper (SUMSS II: Mauch et al. 2003).
The 843 MHz (36 cm) peak brightness of the source, in units of mJy/beam. Two of the sources in this catalog, SUMSS J132528-430110 (Cen A) and SUMSS J132110-434249 (NGC 5090), have been assigned peak brightnesses of 0.0 mJy/beam. The entries for these sources were added to the catalog by hand (by the authors) as they were too complex for an elliptical Gaussian fit, and hence peak brightnesses were considered to be meaningless in these cases. Please refer to Section 6.3 of SUMSS Paper II for a description of how these two sources were included.
The associated uncertainty in the 843 MHz (36 cm) peak brightness calculated from the quadratic sum of equation 8 of the catalog paper (SUMSS II: Mauch et al. 2003) and the MOST flux density calibration uncertainty of 3 per cent, in units of mJy/beam.
The total (integrated) 36-cm flux density of the source, in mJy.
The associated uncertainty in the total 36-cm flux density, calculated from the equations described in Condon (1997, PASP, 109, 166), in mJy.
The fitted major axis of the source, in arcseconds.
The fitted minor axis of the source, in arcseconds.
The fitted major axis position angle of the source, in degrees east of north. Most unresolved sources would have PA values close to 0 or 180 degrees, since the MOST elliptical beam has a position angle PA=0.
The major axis of the source after deconvolution from the MOST beam, in arcseconds. This parameter is given if the fitted major axis size exceeds the beam size by more than 2.33 times the sigma of the fitted major axis size.
The minor axis of the source after deconvolution from the MOST beam, in arcseconds. If the major axis is resolved, the minor axis is subsequently checked using the same criterion, viz., this parameter is filled if the fitted minor axis size exceeds the beam size by more than 2.33 times the sigma of the fitted minor axis size.
The deconvolved position angle of the source, in degrees east from north. This parameter is given if the major axis is resolved.
The name of the mosaic in which the source appears. 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 catalog.
The number of mosaics in which the source appears. This is included to let the user know when the source appears in more than one image. The source parameters which appear in the catalog are those for the most reliable fit.
The X pixel position of the source on the quoted mosaic.
The Y pixel position of the source on the quoted mosaic.