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VIII/22 6C Survey of Radio Sources III (6CSRSIII; Hales+ 1990)
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The 6C Survey of Radio Sources - III.
The Zone 48 Degrees < Dec < 68 Degrees, 05h 25m < RA < 18h 17m
Hales S.E.G., Masson C.R., Warner P.J., Baldwin J.E.
<Mon. Not. R. Astron. Soc. 246, 256 (1990)>
=1990MNRAS.246..256H
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ADC_Keywords: Radio sources; Surveys
Summary:
This catalogue contains the third section of the 6C Cambridge survey of
radio sources at 151 MHz. This part of the survey covers the region
from 48 deg to 68 deg in declination and between 5h 25m and 18h 17m
in right ascension. This survey has an angular resolution of
4.2 arcmin x 4.2 arcmin x cosec(dec) (half-power at map center). The
limiting flux density varies between 160 mJy to 600 mJy as a function
of map and declination. Data include the source positions (B1950),
peak flux density, integrated flux density, contour map panel number and
contour map field names. This part of the survey contains 8749 sources,
covering an area of 1950 square degrees. This catalogue slightly overlaps
the Hales et al. (1988) survey.
Description:
"The 6C Survey of Radio Sources - III. The Zone 48 deg < Dec <68 deg,
05h 25m < RA < 18h 17m" (6CSRSIII) 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 third in a series of papers giving radio source observations at
151 MHz. See the discussion in Baldwin et al. (1985) for details on the
design and operation of the telescope and the generation of the survey.
Other papers in this series include Hales et al. (1988) and Hales et
al. (1991).
This portion of the catalogue contains a listing of 8749 radio sources
ordered by increasing right ascension. The survey is centered on a
declination of 58 deg to facilitate calibration using Cassiopea A. This
survey has been divided into six separate fields with up to 32 panels
per field.
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 +/-5%. 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
6CSRSIII and Hales et al. (1988) for details on source selection
criterion, calibration, and error analysis.
Source positions have been adjusted by 1.1s to 2.3s in right ascension
and up to -40 arcsec in declination, to agree with known positions of bright
sources. The authors believe that the residual systematic errors are
less than +/-5 arcsec in each coordinate.
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 Hales, Masson, Warner and Baldwin (1990). 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
"The 6C Survey of Radio Sources - III. The Zone 48 deg < Dec < 68 deg ,
05h 25m < RA < 18h 17m " consists of a single fixed-block file of 8749
48-byte records. The original file contained 51-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
6csrsiii.dat 48 8749 Catalog data
6csrsiii.tex 71 200 LaTeX ADC Document
adc.sty 68 38 ADC Style File
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See also:
http://imagelib.ncsa.uiuc.edu/project/document/95.SH.03 : FITS images
of the survey available from the NCSA Astronomy Digital Image Library
Byte-by-byte Description of file: 6csrsiii.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- 10 F4.1 s RAs Right ascension (B1950)
12- 14 I3 deg DEd Declination (B1950)
16- 17 I2 arcmin DEm Declination (B1950)
19- 20 I2 arcsec DEs Declination (B1950)
23- 27 F5.2 Jy PeakFlux * Flux density (peak)
30- 34 F5.2 Jy IntFlux *? Flux density (integ.)
35 A1 --- n_IntFlux *[-* ] Integrated flux flag
37- 39 I3 --- map_num *Contour map panel number
40 A1 --- colon The character ":"
41- 47 A7 --- field *Contour map field name
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Note on PeakFlux:
Flux density (peak): Source peak flux density at 151 MHz.
Note on IntFlux:
Flux density (integrated): Source integrated flux density at 151 MHz.
Integrated flux densities were carried out for sources with fitted peak
flux densities above 456 mJy per beam area (before primary beam
correction). The integration was carried out to a limiting level of
10% of the fitted peak (or 98 mJy for sources having fitted peak values
<0.98 Jy). Note that for unresolved sources the integrated flux value
can fall below the peak value.
Note on n_IntFlux:
Integrated flux flag: If the column is marked with a dash (-), the
peak flux was not strong enough to calculate the integrated flux. If
the column is marked with an asterisk (*), the peak flux was strong
enough to qualify for integration, but it has been integrated into a
brighter adjoining peak.
Note on map_num:
Contour map panel number: This column contains the name of the map
panel in which the source appears. There are up to 32 panels per map
field in this survey. The panel number and map field name tell the
user where to look up the source of interest in the published contour
map. A panel number listed with a negative sign indicates that the
data are accommodated at the location but come from another map or area
of sky.
Note on field:
Contour map field name: This column contains the name of the
field in which the source appears. Six fields have been
included in this survey: 0700+58, 0900+58, 1100+58, 1300+58,
1500+58, and 1700+58. The panel number and map field name tell the
user where to look up the source of interest in the published contour
map.
History:
"The 6C Survey of Radio Sources - III. The Zone 48 deg < Dec <68 deg,
05h 25m < RA < 18h 17m" 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.
The integrated flux flag column was added by the ADC/CDS by extracting
the character information from the Integrated flux density column.
This was done to avoid mixing character and numeric information in the
same column.
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., Masson, C.R., Warner, P.J. and Baldwin, J.E. 1990,
MNRAS, 246, 256
Hales, S.E.G., Mayer, C.J., Warner, P.J. and Baldwin, J.E. 1991, MNRAS,
251, 46
Roger, R.S., Bridle, A.H. and Costain, C.H. 1973, AJ, 78, 1030
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(End) N. Oliversen and N.P.M. Kuin (ADC/SSDOO/NASA) 10-MAY-1995