Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-14
Astrophys.J.658:203-216,2007
Astronomy and Astrophysics
Astrophysics
36 pages, 3 tables, 13 figures; accepted for publication in ApJ
Scientific paper
10.1086/511005
We present the first results of the VLBA Imaging and Polarimetry Survey (VIPS), a 5 GHz VLBI survey of 1,127 sources with flat radio spectra. Through automated data reduction and imaging routines, we have produced publicly available I, Q, and U images and have detected polarized flux density from 37% of the sources. We have also developed an algorithm to use each source's I image to automatically classify it as a point-like source, a core-jet, a compact symmetric object (CSO) candidate, or a complex source. The mean ratio of the polarized to total 5 GHz flux density for VIPS sources with detected polarized flux density ranges from 1% to 20% with a median value of about 5%. We have also found significant evidence that the directions of the jets in core-jet systems tend to be perpendicular to the electric vector position angles (EVPAs). The data is consistent with a scenario in which ~24% of the polarized core-jets have EVPAs that are anti-aligned with the directions of their jet components and which have a substantial amount of Faraday rotation. In addition to these initial results, plans for future follow-up observations are discussed.
Blandford R. G.
Cotter Garret
Fassnacht Chris D.
Gehrels Neil
Healey Steve
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