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Characteristics of Gamma-Ray Loud Blazars in the VLBA Imaging and Polarimetry SurveyThe radio properties of blazars detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope have been observed as part of the VLBA Imaging and Polarimetry Survey. This large, flux-limited sample of active galactic nuclei (AGNs) provides insights into the mechanism that produces strong gamma-ray emission. At lower flux levels, radio flux density does not directly correlate with gamma-ray flux. We find that the LAT-detected BL Lac objects tend to be similar to the non-LAT BL Lac objects, but that the LAT-detected FSRQs are often significantly different from the non-LAT FSRQs. The differences between the gamma-ray loud and quiet FSRQS can be explained by Doppler boosting; these objects appear to require larger Doppler factors than those of the BL Lac objects. It is possible that the gamma-ray loud FSRQs are fundamentally different from the gamma-ray quiet FSRQs. Strong polarization at the base of the jet appears to be a signature for gamma-ray loud AGNs.
Document ID
20120009947
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Linford, J. D.
(New Mexico Univ. Albuquerque, NM, United States)
Taylor, G. B.
(New Mexico Univ. Albuquerque, NM, United States)
Romani, R. W.
(Stanford Univ. Stanford, CA, United States)
Healey, S. E.
(Stanford Univ. Stanford, CA, United States)
Helmboldt, J. F.
(Naval Research Lab. Washington, DC, United States)
Readhead, A. C.
(California Inst. of Tech. Pasadena, CA, United States)
Reeves, R.
(California Inst. of Tech. Pasadena, CA, United States)
Richards, J. L.
(California Inst. of Tech. Pasadena, CA, United States)
Cotter, G.
(Oxford Univ. Oxford, United Kingdom)
Date Acquired
August 25, 2013
Publication Date
January 1, 2010
Publication Information
Publication: The Astrophysical Journal
Issue: 16
Subject Category
Astronomy
Report/Patent Number
AD-A554848
Funding Number(s)
CONTRACT_GRANT: GSFC 21078/FERMI08-0051
Distribution Limits
Public
Copyright
Other
Keywords
LAT(LARGE AREA TELESCOPE)
AGNS( ACTIVE GALACTIC NUCLEI)
RADIO CONTINUUM

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