VIII/70A Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2003)
The Sydney University Molonglo Sky Survey (SUMSS), Version 25 February 2003.
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 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 will consist of about
590 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 1.1 of the catalogue consists of 107729 radio sources made
by fitting elliptical gaussians in 271 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 correcly identifies and
rejects spurious sources in over 96% of cases.
Version 1.0 of SUMSS was dated February 2003 and contained 107765
radio sources; several spurious catalogue entries have been removed,
and the declination quoted was changed from 2 decimals to one.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sumsscat.dat 135 134870 The SUMSS Catalog, Version 1.2 (2003-07-01)
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See also:
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
http://www.astrop.physics.usyd.edu.au/sumsscat/ : the SUMSS Home Page
Byte-by-byte Description of file: sumsscat.dat
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Bytes Format Units Label Explanations
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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)
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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 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.
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Nomenclature Notes:
SUMSS sources should be referred by their truncated position
SUMSS JHHMMSS-DDMMSS
History:
From http://www.astrop.physics.usyd.edu.au/sumsscat/
* 07-Jun-2003: Version sumsscat.Apr-8-2003
* 19-Sep-2003: Version sumsscat.Jul-1-2003
(End) Francois Ochsenbein [CDS] 07-Jun-2003