The GB/NAIC 5GHz Survey

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1983ApJS...51...67Lawrence+

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.

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)
- NO: Not observed