| We present observations of the region between 5o <= l <= 45 and b <= 3o, in the OH 1612.231 MHz line, taken from 1993 to 1995 with NRAO's Very Large Array (VLA). These observations are the last part of a larger survey, covering l <= 45o and b <= 3o, with the Australia Telescope Compact Array (ATCA) and the VLA. The region was systematically observed on a 30 arcmin × 30 arcmin grid in (l,b) and the resulting coverage was 92%, with 965 pointings. We found 286 OH-masing objects, 161 of which are new detections and 207 have reliable IRAS point-source identifications. The outflow velocity was determined for 276 sources. A total of 766 sources were detected in the combined ATCA/VLA survey, of which 29 were detected in two regions of the survey. In this article we analyse the data statistically and give identifications with known sources where possible. The ``efficiency'' of this VLA survey is 75% of that of the ATCA Bulge survey. This efficiency was determined by comparing the detections in the region where the two surveys overlap. The completeness- and error characteristics are similar, though less homogeneous, except for the much larger errors in the flux densities. The relatively large surface number density found in the northern disk, suggests that we can see the Bar extending to higher longitudes on this side of the Galactic Center Figure 10 is only available in electronic form at http://www.edpsciences.org The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. eprintid: arXiv:astro-ph/0011259 |
Comments:
Single peak sources: Entries with vexp = 0.0 were changed to NULL
Velocity resolution: 1 km/s
Typical position uncertainty: < 1 arcsecond
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