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VIII/18 6C Survey of Radio Sources I (6CSRSI; Baldwin+ 1985)
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The 6C Survey of Radio Sources - I. Declination Zone Dec > 80 deg
Baldwin J.E., Boysen R.C., Hales S.E.G., Jennings J.E.,
Waggett P.C., Warner P.J.
<Mon. Not. R. Astron. Soc. 217, 717, (1985)>
=1985MNRAS.217..717B
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ADC_Keywords: Radio sources; Surveys
Summary:
This catalogue contains the first section of the 6C Cambridge survey of
radio sources at 151 MHz. This part of the survey covers the region
north of a declination of 80 deg. This survey has an angular
resolution of 4.2 arcmin x 4.2 arcmin x cosec(dec) (half-power at map
center) and a limiting flux density of 120mJy at 151 MHz. Data include
the source positions (B1950), peak flux density, integrated flux density,
and contour map number. This part of the survey contains 1761 sources.
Description:
"The 6C Survey of Radio Sources - I. Declination Zone Dec > 80 deg"
(6CSRSI) contains a compilation of radio source observations made
with the use of an (non-tracking) Earth-rotation aperture synthesis
telescope comprising many small aerial arrays on an east-west baseline
operating at 151 MHz. This paper is the first in a series of papers
giving radio source observations at 151 MHz. See the discussion in
6CSRSI for details on the design and operation of the telescope and the
generation of the survey. The other papers in this series include,
Hales et al. (1988), Hales et al. (1990) and Hales et al. (1991).
This portion of the catalogue contains a listing of 1761 radio sources
ordered by increasing right ascension. The survey covers a circular
area of radius 10 deg centered on the North Celestial Pole. This survey
has been divided into 32 separate maps.
Flux densities are on the scale of Roger, Bridle, and Costain (1973)
(RBC). The authors believe the flux density scale is consistent with
the RBC scale to within +/-10%. Both the peak flux density and the
integrated flux densities required a primary-beam correction, and the
peak flux densities required a further correction for the reduction in
peak brightness caused by chromatic aberration. The latter correction
is dependent on the distance of the source from the field center. See
6CSRSI for details on source selection criterion, calibration, and
error analysis.
Source positions have been systematically adjusted with respect to a
frame defined by standard positions of the 3C sources in the field.
Positional uncertainties have been estimated to correspond to
approximately 4 arcsec/S, where S is the apparent peak flux density
(in Jy) before primary beam correction. See 6CSRSI for further details.
Note that this file only contains the catalogue of radio sources. It
is intended to be used with the radio maps originally published on
microfiche in Baldwin, Boysen, Hales, Jennings, Waggett, Warner and
Wilson (1985). The source lists and FITS format maps for the four
regions of the 6C survey published to date have been placed on a CDROM
entitled "Images from the Radio Universe", which is available from the
address below. A nominal fee may be charged for such requests.
Prof. Jim Condon
NRAO
Edgemont Road
Charlottesville, Virginia 22903-2475
Structure:
The File as a Whole
"Survey of Radio Sources - I. Declination Zone Dec > 80 deg" consists
of a single fixed-block file of 1761 36-byte records. The original
file contained 40-byte records. Detailed descriptions of some of the
fields in the file are given in the following sections.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This File
6csrsi.dat 36 1761 The 6C I Catalog
6csrsi.tex 72 175 ADC LaTeX Document
adc.sty 68 38 ADC TeX Style File
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See also:
http://imagelib.ncsa.uiuc.edu/project/document/95.SH.01 : FITS images
of the survey available from the NCSA Astronomy Digital Image Library
Byte-by-byte Description of file: 6csrsi.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (B1950)
4- 5 I2 min RAm Right ascension (B1950)
7- 8 I2 s RAs Right ascension (B1950)
10- 12 I3 deg DEd Declination (B1950)
14- 15 I2 arcmin DEm Declination (B1950)
17- 18 I2 arcsec DEs Declination (B1950)
21- 25 F5.2 Jy PeakFlux *Flux density (peak)
27- 31 F5.2 Jy IntFlux *? Flux density (integ.)
35- 36 I2 --- map_num *Contour map panel
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Note on PeakFlux:
Source peak flux density at 151 MHz.
Note on IntFlux:
Source integrated flux density at 151 MHz.
Integrated flux densities were carried out for sources with fitted peak
flux densities above 300 mJy per beam area (before primary beam
correction). The integration was carried out to a limiting level of
10% of the fitted peak (or 50 mJy for sources having fitted peak values
<500 mJy. The sums were then normalized by comparison with the
same procedure applied to an ideal point source of 1 Jy.
Note that for unresolved sources the integrated flux value can fall
below the peak value. If the column is blank the peak flux was not
strong enough to calculate the integrated flux.
Note on map_num:
This column contains the number of the map panel
in which the source appears. There are 32 panels in this survey.
Remarks:
"The 6C Survey of Radio Sources - I. Declination Zone Dec > 80 deg" was
received by the Astronomical Data Center (ADC), NASA Goddard Space
Flight Center, from Dr. Heinz Andernach. The catalog was originally
submitted by the first author, Dr. Sally Hales.
References:
Baldwin, J.E., Boysen, R.C., Hales, S.E.G., Jennings, J.E., Waggett,
P.C., Warner, P.J. and Wilson, D.M.A. 1985, MNRAS, 217, 717
Hales, S.E.G., Baldwin, J.E. and Warner, P.J. 1988, MNRAS, 234, 919
Hales, S.E.G. et al. 1990, MNRAS, 246, 256
Hales, S.E.G. et al. 1991, MNRAS, 251, 46
Roger, R.S., Bridle, A.H. and Costain, C.H. 1973, AJ, 78, 1030
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(End) N.P.M. Kuin and N. Oliversen (ADC/SSDOO/NASA) 10-MAY-1995