The VLBA Imaging and Polarimetry Survey at 5 GHz

By J. Helmboldt, G. Taylor, S. Tremblay, C. Fassnacht, R. Walker, S. Myers, L. Sjouwerman, T. Pearson, A. Readhead, L. Weintraub and 6 more. 2006

181 citations recorded by the source corpus.

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 MBH and 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.

Subfields: Aerospace Engineering, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/321ce7646d5f12f928a853659e1c516edadf1dab

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In Astronomy and Astrophysics

1. M. Lister
2. Y. Kovalev
3. T. Savolainen
4. A. Pushkarev
5. S. Komossa
6. D. Homan
7. D. Grupe
8. Luigi Foschini

In Nuclear and High Energy Physics

1. M. Lister
2. Y. Kovalev
3. T. Savolainen
4. A. Pushkarev
5. D. Homan
6. Luigi Foschini
7. M. Aller
8. A. Lähteenmäki

Citations in the corpus

• The 5th edition of the Roma-BZCAT. A short presentation (2015, methodology): “For each source, in addition to the J2000 coordinates mostly derived from VLBI (Titov & Malkin 2009; Titov et al. 2011; Petrov & Taylor 2011), WISE and optical databases like SDSS, the following data are also given: – the apparent magnitude R from USNO B1 or r from SDSS DR10, or in other bandpasses…”
• Properties of flat-spectrum radio-loud Narrow-Line Seyfert 1 Galaxies (2014, methodology): “A VLBA observation at 5 GHz with milliarcsecond resolution in 2006 resulted in a flux density of∼ 33 mJy (Helmboldt et al. 2007).”
• MOJAVE. XIII. PARSEC-SCALE AGN JET KINEMATICS ANALYSIS BASED ON 19 YEARS OF VLBA OBSERVATIONS AT 15 GHz (2016, background): “1435+638 (VIPS 0792): We presumed the radio core to lie at the northernmost end of the jet, based on the VIPS 5 GHz VLBA map of Helmboldt et al. (2007).”
• The GMRT 150 MHz all-sky radio survey - First alternative data release TGSS ADR1 (2016, background): “The RFC is a collection of nearly 10 000 radio sources with positions measured from numerous astrometric and geodetic campaigns accurate to several milliarcseconds (e.g., Petrov & Taylor 2011).”