Phase calibration sources in the northern sky at galactic latitudes vertical bar b vertical bar < 2(.)over-circle5

Citation
Jm. Wrobel et al., Phase calibration sources in the northern sky at galactic latitudes vertical bar b vertical bar < 2(.)over-circle5, ASTRONOM J, 122(3), 2001, pp. 1669-1672
Citations number
17
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMICAL JOURNAL
ISSN journal
00046256 → ACNP
Volume
122
Issue
3
Year of publication
2001
Pages
1669 - 1672
Database
ISI
SICI code
0004-6256(200109)122:3<1669:PCSITN>2.0.ZU;2-C
Abstract
The Jodrell Bank-VLA Astrometric Survey (JVAS) of flat-spectrum sources yie lded a catalog of 2118 compact radio sources in the northern sky. Those sou rces are being used as phase calibrators for many synthesis arrays. JVAS su ffers from a zone of avoidance because Galactic confusion prevented selecti on of flat-spectrum sources at \b \ < 2.<degrees>5. This confusion problem was overcome by selecting variable sources from the GB6 Catalog in the JVAS zone of avoidance. A subset of these sources were observed at 8.5 GHz with the NRAO VLA in the JVAS style, leading to 29 compact radio sources in the zone of avoidance whose positions have been measured to an rms accuracy of about 10 mas or less. This extension of the JVAS lists to lower Galactic l atitudes (1) improves the prospects for VLBA phase-referencing of Galactic targets and (2) strengthens the lists' usefulness for studies of the Galact ic interstellar medium.