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Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS)

Taylor, G. B. and Healey, S. E. and Helmboldt, J. F. and Tremblay, S. and Fassnacht, C. D. and Walker, R. C. and Sjouwerman, L. O. and Pearson, T. J. and Readhead, A. C. S. and Weintraub, L. and Gehrels, N. and Romani, R. W. and Michelson, P. F. and Blandford, R. D. and Cotter, G. (2007) Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS). Astrophysical Journal, 671 (2). pp. 1355-1364. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20091204-110156052

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Abstract

We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE survey and most other samples that have been used to study the properties of EGRET blazars. At lower flux levels, radio flux density does not directly correlate with gamma-ray flux density. We do find that the EGRET-detected blazars tend to have higher brightness temperatures, greater core fractions, and possibly larger than average jet opening angles. A weak correlation is also found with jet length and with polarization. All of the well-established trends can be explained by systematically larger Doppler factors in the gamma-ray-loud blazars, consistent with the measurements of higher apparent velocities found in monitoring programs carried out at radio frequencies above 10 GHz.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/523264DOIArticle
https://arxiv.org/abs/0709.0968arXivDiscussion Paper
ORCID:
AuthorORCID
Taylor, G. B.0000-0001-6495-7731
Fassnacht, C. D.0000-0002-4030-5461
Pearson, T. J.0000-0001-5213-6231
Readhead, A. C. S.0000-0001-9152-961X
Romani, R. W.0000-0001-6711-3286
Blandford, R. D.0000-0002-1854-5506
Additional Information:© 2007 American Astronomical Society. Print publication: Issue 2 (2007 December 20); received 2007 June 3; accepted for publication 2007 September 6. We thank an anonymous referee for constructive suggestions. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Subject Keywords:catalogs; galaxies: active; galaxies: jets; galaxies: nuclei; radio continuum: galaxies; surveys; techniques: image processing
Issue or Number:2
Record Number:CaltechAUTHORS:20091204-110156052
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20091204-110156052
Official Citation:Characteristics of EGRET Blazars in the VLBA Imaging and Polarimetry Survey (VIPS) G. B. Taylor, S. E. Healey, J. F. Helmboldt, S. Tremblay, C. D. Fassnacht, R. C. Walker, L. O. Sjouwerman, T. J. Pearson, A. C. S. Readhead, L. Weintraub, N. Gehrels, R. W. Romani, P. F. Michelson, R. D. Blandford, and G. Cotter 2007 ApJ 671 1355-1364 doi: 10.1086/523264
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16875
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:04 Dec 2009 22:09
Last Modified:09 Apr 2020 17:32

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