VIII/79A The VLA Low-frequency Sky Survey at 74MHz (Cohen+ 2007)
The VLA Low-frequency Sky Survey
Cohen A.S., Lane W.M., Cotton W.D., Kassim N.E., Lazio T.J.W.,
Perley R.A., Condon J.J., Erickson W.C.
<Astron. J. 134, 1245 (2007)>
=2007AJ....134.1245C 2007AJ....134.1245C
ADC_Keywords: Radio continuum ; Radio sources ; Surveys
Keywords: Atmospheric Effects - Catalogs - Radio Continuum: General - Surveys
Abstract:
The VLA Low-Frequency Sky Survey (VLSS) is a 74MHz (4m) continuum
survey covering the entire sky north of -30° declination. Using
the VLA in B- and BnA-configurations, we will map the entire survey
region at a resolution of 80" and with an average rms noise of 0.1
Jy/beam. For a detailed description of the survey and its scientific
motivations, please see the original proposal to the NRAO skeptical
review committee.
The VLSS is being made as a service to the astronomical community,
and the principal data products are being released to the public as
soon as they are produced and verified. Details and access to the
images can be found at http://lwa.nrl.navy.mil/VLSS/
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 116 68311 The VLSS Catalog, Version 2007-06-26
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See also:
http://lwa.nrl.navy.mil/VLSS/ : The VLSS Home Page
VIII/41 : The UTR-2 Very Low-Frequency Sky Survey Data (Braude+ 1978-1982)
VIII/62 : The Westerbork Northern Sky Survey (Leiden, 1998)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
Byte-by-byte Description of file: catalog.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 [0,60] Right Ascension J2000 (seconds)
13 A1 --- DE- Declination J2000 (sign)
14- 15 I2 deg DEd Declination J2000 (degrees)
17- 18 I2 arcmin DEm Declination J2000 (minutes)
20- 23 F4.1 arcsec DEs [0,60] Declination J2000 (seconds)
26- 33 F8.2 Jy Si Integrated flux density at 74MHz
35 A1 --- l_MajAx [<] Limit flag on MajAx
36- 40 F5.1 arcsec MajAx Major axis of deconvolved component size
42 A1 --- l_MinAx [<] Limit flag on MinAx
43- 47 F5.1 arcsec MinAx Minor axis of deconvolved component size
49- 54 F6.2 deg PA ? Position angle of Major Ax
57- 64 A8 --- Field Field designation (2)
68- 71 I4 pix Xpos X position of source on map
73- 76 I4 pix Ypos Y position of source on map
79- 83 F5.2 s e_RAs Mean error on RA
85- 88 F4.1 arcsec e_DEs Mean error on Declination
91- 97 F7.2 Jy e_Si ? Mean error on Si (1)
100-104 F5.1 arcsec e_MajAx ? Mean error on MajAx
106-109 F4.1 arcsec e_MinAx ? Mean error on MinAx
111-116 F6.2 deg e_PA ? Mean error on PA
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Note (1): a large residual indicate a complex structure, i.e. that
the model is inadequate to completely describe the source and the
original image needs to be examined.
Note (2): Images are available from http://www.cv.nrao.edu/4mass/MAPS/
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History:
* 08-Aug-2006: First version, from http://www.cv.nrao.edu/4mass/CATALOG/.
* 21-Feb-2008: New version http://lwa.nrl.navy.mil/VLSS/VLSScatalog07Jun26
(End) Francois Ochsenbein [CDS] 08-Aug-2006