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 http://resolver.caltech.edu/CaltechAUTHORS:20091204-110156052
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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.
|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.|
|Subject Keywords:||catalogs; galaxies: active; galaxies: jets; galaxies: nuclei; radio continuum: galaxies; surveys; techniques: image processing|
|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.|
|Deposited By:||Jason Perez|
|Deposited On:||04 Dec 2009 22:09|
|Last Modified:||26 Dec 2012 11:36|
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