J/A+AS/65/267 A 5-GHz Survey of Radio Sources (Altschuler 1986)
A 5-GHz Survey of Radio Sources
Altschuler D.R.
<Astron. Astrophys. Suppl. Ser. 65, 267 (1986)>
=1986A&AS...65..267A 1986A&AS...65..267A
ADC_Keywords: Radio sources ; Surveys
Keywords: radio continuum: general - surveys
Description:
The results of a sensitive radio survey of about 0.04 sr of
extragalactic sky in a narrow strip about declination = +33 deg are
reported. The measurements were made with the NRAO 91-meter Green Bank
telescope at a frequency of 4760 MHz. A catalogue of the 882 sources
detected above a flux density of 15 mJy is given. The area surveyed is
part of that covered earlier by the NRAO 5-GHz Survey of Faint
Sources, Davis (1971). The results will allow an unbiased study of the
variability characteristics of sources common to both surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 63 882 Catalog of radio sources
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See also:
VIII/52 : The MIT-Green Bank 5 GHz Survey (Bennett+, 1986-91)
VIII/14 : 87GB Radio Sources 4.85 GHz (Gregory, Condon 1991)
The NRAO 5 GHz Radio Source Survey. I. A Survey of Faint Sources (Davis 1971)
=1971AJ.....76..980D 1971AJ.....76..980D
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Source name
11- 12 I2 h RAh Right Ascension (1950)
13- 14 I2 min RAm Right Ascension (1950)
15- 18 F4.1 s RAs Right Ascension (1950)
19 A1 --- DE- Declination sign
20- 21 I2 deg DEd Declination (1950)
22- 23 I2 arcmin DEm Declination (1950)
24- 25 I2 arcsec DEs Declination (1950)
27- 29 I3 arcsec e_DEs Declination error
32- 35 F4.0 deg GLAT Galactic latitude
37- 41 F5.0 mJy S4760 4760 MHz flux density
43- 46 F4.0 mJy e_S4760 error in flux density
48- 63 A16 --- Notes *Source comments
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Note on Notes:
The responses due to sources were measured as follows: A Gaussian function
(no fixed parameters) was fitted to the highest positive response giving its
peak value, position, and width, and then subtracted from the data. This was
repeated until no response higher than 6 mK remained, a value which is about
twice the typical residual rms value for a scan. The same procedure was then
applied to the negative responses. A total of about 2400 responses were
obtained. The rms value sigma_r of the residual for each scan was then
computed. The average value of sigma_r for all of the scans is 2.9 mK and
the median is 2.7 mK.
Sources were tentatively identified by requiring either two responses
(positive and negative) greater than 7 mK or at least one response greater
than 10 mK separated by 34" ± 10". A statistical analysis of all of the
responses was performed to ascertain the overall quality of the data and to
find and delete spurious ones.
The formal errors for the declination and flux density of a source were
obtained using sigma_r and propagating this error according to standard
statistical procedures when computing the resultant position and peak flux
density. An intensity proportional term of 5%, as determined from the
repeated observations of the calibration sources, was added quadratically to
the resultant error for the flux density due to confusion and
noise. These are the errors given in table1.dat
a = At least one response used has a height less than 3 sigma_r
b = The separation between responses differs from the average by more than
2 sigma
c = At least one response has a width which differs from the average by more
than 2 sigma
d = The source appears confused, and its flux density is not reliable
e = Strong source at the edge of the survey with unreliable flux
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History:
The printed version of the catalog was page-scanned and proof-read by
H. Andernach in Jan. 1995. Two typographical errors in the printed paper
were corrected: (1) The RA of source 0009+334 was incorrectly listed as
10h09m; (2) Source 0714+329 was incorrectly listed as 0714+299. For 33
pairs of sources the same name was attached to two different positions.
This ambiguity was removed by appending an "a" to the first and a "b" to
the second occurence of the source.
Acknowledgements:
An electronic version of the data table was provided to ADC by H. Andernach.
(End) T. Sodroski [SSDOO/ADC] 05-Nov-1999