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5GHz observations of sources in the ARECIBO 611 MHZ survey
Lawrence C.R., Bennett C.L., Garcia-Barreto J.A., Greenfield P.E.,
and B.F. Burke
Abstract
Of the 3118 sources in the Arecibo 611 MHz survey, 2911 have been observed
using the NRAO 300 ft transit telescope at 6 cm. Positions, flixes, and
spectral indeces are given for 2661 detected sources.
Obsrvations
In 1978 Nov. (2500 src) and 1980 Jan. (400) 91 m telescope,
2.8' FWHM at 4755 MHz.
Calibration
Calibrator sources (Table1) were observed in the declination range -10 - +30^o
always with a feed position angle of 68^o. In addition, accurate
radio positions for 133 of the survey sources themselfs were known (Table 2).
Forty-three are VLA calibrators, 25 are optically identified Parkes sources.
and 66 have been observed at the Arecibo positions.
Columns in Table 4:
1
A: IAU mane in col. (2) is based on Arecibo position. Such sources
were unobserved or undetected at 5 GHz.
G: IAU name is based on Green Bank position.
X: IAU name is based on Green Bank RA and Arecibo Dec. We were
unable to determine the dec. of such sources.
2 IAU name
3 EXT: Extended in RA as determined in eye examination. Instead of errors,
the ranges of values measured for position and are given in cols. (5)
(7) and (9) in form: mid value (1/2 range).
A large RA range ( > 10 or 20 s) is indicative of either complicated
structure in a single, or multiple sources that we could not untangle.
4 Mean 1950 RA (see col.3.). For unobserved or undeteced sources (A in
col.1), the Arecibo RA is listed. The sources are listed in the same
order as in the Arecibo catalog.
5 RA error in seconds (see col.3.)
6 Mean 1950 Decl. (see col.3.). if A appears in col.1, the Arecibo dec. is
listed.
7 Dec error in arc seconds (see col.3.)
8 Mean flux (see col.3.) in Jy. If an appears in col.1. the 611 MHz
flux and error are listed inside square brackets.
9 Flux error (see col.3.).
10 Spectral index (S~nu^-a)
11 Spectral index error
12 RA difference (Arecibo - GB)
13 Dec difference (Arecibo - GB)
14 Arecibo RA error (from Durdin et al. 1975)
15 Arecibo DEC error (from Durdin et al. 1975)
16 Number of observations, in the form abc, where a is the number of
observations averaged in RA, b is the number of observations averaged
Dec, c is the number of observations averaged in flux. If "ND"
appears in col.17, c is the number of the times the source was observed
17
XR: Possibly extended
XD: Possibly extended
VA: Possibly variable
ND: No detection (The detection limit depends stringly on
source extension)