Astrophys. J., 658, 203-216 (2007/March-3)
The VLBA imaging and polarimetry survey at 5 GHz.
HELMBOLDT J.F., TAYLOR G.B., TREMBLAY S., FASSNACHT C.D., WALKER R.C., MYERS S.T., SJOUWERMAN L.O., PEARSON T.J., READHEAD A.C.S., WEINTRAUB L., GEHRELS N., ROMANI R.W., HEALEY S., MICHELSON P.F., BLANDFORD R.D. and COTTER G.
Abstract (from CDS):
We present the first results of the VLBA Imaging and Polarimetry Survey (VIPS), a 5 GHz VLBI survey of 1127 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 pointlike source, a core jet, a compact symmetric object (CSO) candidate, or a complex source. Using data from the Sloan Digital Sky Survey (SDSS), we have found no significant trend between optical flux and 5 GHz flux density for any of the source categories. Using the velocity width of the Hβ emission line and the monochromatic luminosity at 5100 Å to estimate the central black hole mass, MBH, we have found a weak trend between MBHand 5 GHz luminosity density for objects with SDSS spectra. 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 are consistent with a scenario in which ∼24% of the polarized core jets have EVPAs that are antialigned with the directions of their jet components and that have a substantial amount of Faraday rotation. In addition to these initial results, plans for future follow-up observations are discussed.
Catalogs - Galaxies: Active - Galaxies: Jets - Galaxies: Nuclei - Radio Continuum: Galaxies - Surveys - Techniques: Image Processing
VizieR on-line data:
<Available at CDS (J/ApJ/658/203): table1.dat table3.dat>
Table 1: VIPS NNNN (Nos 1-1119) = VIPS JHHMMm+DDMM N=1119.
Status at CDS
All or part of tables of objects could be ingested in SIMBAD with priority 2.
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