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The VLBA Imaging and Polarimetry Survey at 5 GHz | | J. F. Helmboldt
; G. B. Taylor
; S. Tremblay
; C. D. Fassnacht
; R. C. Walker
; S. T. Myers
; L. O. Sjouwerman
; T. J. Pearson
; A. C. S. Readhead
; L. Weintraub
; N. Gehrels
; R. W. Romani
; S. Healey
; P. F. Michelson
; R. G. Blandford
; G. Cotter
; | | Date: |
14 Nov 2006 | | Abstract: | 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. | | Source: | arXiv, astro-ph/0611459 | | Services: | Forum | Review | PDF | Favorites | |
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