The VLBA Imaging and Polarization Survey

The VLBA Imaging and Polarization Survey, VIPS for short, is a combined 5 GHz and 15 GHz survey with the Very Long Baseline Array of ~1000 active galactic nuclei (AGN) with full polarization and high dynamic range. The parent sample is the CLASS survey in the region covered by the Sloan Digital Sky Survey in order to facilitate multi-wavelength science.

By the VIPS team Updated on May 2, 2006 following the VIPS collaboration meeting in Albuquerque.

Starting with the CLASS sample we select all sources stronger than 85 mJy at 8.4 GHz in the SDSS northern cap region with a northernmost limit of 65 degrees in order to exclude most of the region from the original footprint that SDSS has opted not to cover. This gives 1127 sources in VIPS. Of these 1127 sources, we find 19 VIPS sources included in the MOJAVE survey, and 147 VIPS sources included in the CJF survey. Allowing for 11 of these MOJAVE sources that are in CJF, and 14 VIPS-pilot sources (5 sources between 50 and 85 mJy no longer meet the 85 mJy flux cutoff and 5 sources were in CJF), a total of 169 sources have been previously observed at 5 or 15 GHz. Subtracting these 169 from 1127 leaves 958 new VIPS sources to be observed. Note that of these 958 sources, 283 (30%) were observed in the VLBA Calibrator Survey, and 43 (5%) have been observed in the USNO ICRF Survey. We do not eliminate any sources due to inclusion in the VCS or ICRF.

For our Large followup proposal we plan to observe 406 polarized jets and CSOs. at 5, 8 and 15 GHz.

Petrov and Taylor (2011) did a full astrometic analysis of the positions and that list of improved positions for 857 sources can be found in this table .

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Your friendly VIPS team members:
Greg Taylor, Chris Fassnacht, Ed Fomalont, Steve Myers, Loránt Sjouwerman, Jim Ulvestad, Craig Walker, Tim Pearson, Tony Readhead, Neil Gehrels, Roger Romani. Peter Michelson. and Roger Blandford.
The Very Long Baseline Array and the National Radio Astronomy Observatory are facilities of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

This page was last modified on May 23, 2005