ACDS V10.0 - Sat Apr 27 18:14:09 CEST 2019
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Detailed Description of VIII/81B :
Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)
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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)
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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
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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/)
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(End) Francois Ochsenbein [CDS] 27-Jun-2013