A Preliminary MIT-VLA Snapshot Survey Catalog: 8000 MG/PMN Sources at 4.8/8.4 GHz and 0.''3 Resolution

Details A Preliminary MIT-VLA Snapshot Survey Catalog: 8000 MG/PMN Sources at 4.8/8.4 GHz and 0.''3 Resolution A Preliminary MIT-VLA Snapshot Survey Catalog: 8000 MG/PMN Sources at 4.8/8.4 GHz and 0.''3 Resolution

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19411101f&link_type=abstract

American Astronomical Society Meeting 194, #111.01

Astronomy and Astrophysics

Astronomy

Scientific paper

A preliminary catalog of the 1981-1994 MIT-VLA Snapshot Survey for radio-loud gravitational lenses will be made available via anonymous ftp from MIT in June 1999 (ftp zenobia.mit.edu; cd pub/fletcher; get mitvla.readme). This plain text catalog contains detailed information on the VLA positions, flux densities and morphologies of ~ 6200 northern MIT-Greenbank (MG) and ~ 1800 Parkes-MIT-NRAO (PMN) radio sources at 4.8 and 8.4 GHz, and at angular resolutions ranging from 0.2 to 0.4 arcseconds. These sources represent ~ 80% of the entire 15 year MIT-VLA Snapshot Survey effort from 1981 to 1995, and are complementary to MIT's VLA-Magellan Gravitational Lens Survey of ~ 1900 flat-spectrum sources begun last year (see J. Winn et al., 1998, BAAS 30(4), p.1425, with a paper recently submitted to the ApJS). The 4.8 GHz single-dish flux densities of the ~ 8000 MIT-VLA sources range from ~ 70 mJy to ~ 5000 mJy. Though the sample is incomplete, it is consistently representative of the wide variety of source morphologies and spectral indices appearing in the MIT-VLA Snapshot Survey. This preliminary MIT-VLA catalog will be improved and checked before publication. It is meanwhile intended as a general purpose resource for the astronomical community; possible uses include (1) organizing an optical follow-up of known gravitational lens candidates within the sample (see A. Fletcher, 1998, MIT Ph.D. thesis), (2) assembling samples of new compact MG and PMN radio sources requiring further imaging using VLBI, such as compact doubles and position calibrators, (3) estimating the mean growth rate of the kiloparsec-scale extended structures in radio-loud AGN (see A. Fletcher & B. Burke, 1998, BAAS 30(4), p.1249), and (4) providing sub-arcsecond information missing from overlapping radio sky surveys made at lower angular resolution, such as the FIRST, WENSS, NVSS and Molonglo Wide Field Surveys.

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