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VIII/78        Sydney University Molonglo Sky Survey (SUMSS)     (Mauch+ 2006)

The Sydney University Molonglo Sky Survey (SUMSS), Version 01 June 2006. Mauch T., Murphy T., Buttery H.J., Curran J., Hunstead R.W., Piestrzynski B., Ropbertson J.G., Sadler E.M. <Mon. Not. R. Astron. Soc. 342, 1117 (2003)> =2003MNRAS.342.1117M
ADC_Keywords: Radio sources ; Surveys ; Radio continuum Keywords: catalogues - surveys - methods: data analysis - astrometry - galaxies: statistics - radio continuum: general Description: The Sydney University Molonglo Sky Survey (SUMSS) is being 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''cosecδ resolution, covering 8000 square degrees from -30 degrees declination southwards. 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 will provide a complete survey of the radio sky. The version 1.7 (01-Jun-2006) of the catalogue consists of 205676 radio sources made by fitting elliptical gaussians in 671 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 for details about all versions of the SUMSS, and an access to the mosaic images. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sumsscat.dat 135 205676 The SUMSS Catalog, Version 1.7 (2006-06-01)
See also: VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) : the SUMSS Home Page Byte-by-byte Description of file: sumsscat.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 2.33σ(θM), 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 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: From
(End) Francois Ochsenbein [CDS] 31-Jul-2006
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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