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DOI: 10.1088/0004-637X/742/1/27

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Astronomical Journal 742 (2011) 27

Gamma-Ray and Parsec-Scale Jet Properties of a Complete Sample of Blazars From the MOJAVE Program

M. L. Lister, M. Aller, H. Aller, T. Hovatta, K. I. Kellermann, Y. Y. Kovalev, E. T. Meyer, A. B. Pushkarev, E. Ros, For The Mojave Collaboration, M. Ackermann, E. Antolini, L. Baldini, J. Ballet 1, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, R. D. Blandford, E. D. Bloom, M. Boeck, E. Bonamente, A. W. Borgland, J. Bregeon, M. Brigida, P. Bruel 2, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian 1, E. Cavazzuti, C. Cecchi, C. S. Chang, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi 3, J. Conrad, S. Cutini, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, S. J. Fegan 2, E. C. Ferrara, J. Finke, W. B. Focke, P. Fortin 2, Y. Fukazawa, P. Fusco, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier 1, S. Guiriec, D. Hadasch, M. Hayashida, E. Hays, D. Horan 2, R. E. Hughes, G. Jóhannesson, A. S. Johnson, M. Kadler, H. Katagiri, J. Kataoka, J. Knödlseder 4, M. Kuss, J. Lande, F. Longo, F. Loparco, B. Lott 5, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. N. Mazziotta, W. Mcconville, J. E. Mcenery, J. Mehault 3, P. F. Michelson, T. Mizuno, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, M. Naumann-Godo 1, S. Nishino, P. L. Nolan, J. P. Norris, E. Nuss 3, M. Ohno, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, M. Ozaki, D. Paneque, D. Parent, M. Pesce-Rollins, M. Pierbattista 1, F. Piron 3, G. Pivato, S. Rainò, A. Readhead, A. Reimer, O. Reimer, J. L. Richards, S. Ritz, H. F.-W. Sadrozinski, C. Sgrò, M. S. Shaw, E. J. Siskind, G. Spandre, P. Spinelli, H. Takahashi, T. Tanaka, J. G. Thayer, J. B. Thayer, D. J. Thompson, G. Tosti, A. Tramacere, E. Troja, T. L. Usher, J. Vandenbroucke, V. Vasileiou 3, G. Vianello, V. Vitale, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, S. Zimmer

For the Fermi-LAT collaboration(s)

(2011-11-20)

We investigate the Fermi LAT gamma-ray and 15 GHz VLBA radio properties of a joint gamma-ray- and radio-selected sample of AGNs obtained during the first 11 months of the Fermi mission (2008 Aug 4 - 2009 Jul 5). Our sample contains the brightest 173 AGNs in these bands above declination -30 deg. during this period, and thus probes the full range of gamma-ray loudness (gamma-ray to radio band luminosity ratio) in the bright blazar population. The latter quantity spans at least four orders of magnitude, reflecting a wide range of spectral energy distribution (SED) parameters in the bright blazar population. The BL Lac objects, however, display a linear correlation of increasing gamma-ray loudness with synchrotron SED peak frequency, suggesting a universal SED shape for objects of this class. The synchrotron self-Compton model is favored for the gamma-ray emission in these BL Lacs over external seed photon models, since the latter predict a dependence of Compton dominance on Doppler factor that would destroy any observed synchrotron SED peak - gamma-ray loudness correlation. The high-synchrotron peaked (HSP) BL Lac objects are distinguished by lower than average radio core brightness temperatures, and none display large radio modulation indices or high linear core polarization levels. No equivalent trends are seen for the flat-spectrum radio quasars (FSRQ) in our sample. Given the association of such properties with relativistic beaming, we suggest that the HSP BL Lacs have generally lower Doppler factors than the lower-synchrotron peaked BL Lacs or FSRQs in our sample.

1:	Astrophysique Interactions Multi-échelles (AIM)
	CNRS : UMR7158 – INSU – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
2:	Laboratoire Leprince-Ringuet (LLR)
	CNRS : UMR7638 – IN2P3 – Polytechnique - X
3:	Laboratoire Univers et Particules de Montpellier (LUPM)
	CNRS : UMR5299 – Université Montpellier II - Sciences et techniques – IN2P3
4:	Institut de recherche en astrophysique et planétologie (IRAP)
	CNRS : UMR5277 – Université Paul Sabatier [UPS] - Toulouse III – Observatoire Midi-Pyrénées
5:	Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG)
	CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I

Research team: GLAST

Subject(s)

:

Physics/Astrophysics/High Energy Astrophysical Phenomena Sciences of the Universe/Astrophysics/High Energy Astrophysical Phenomena

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From: Nathalie Martin <>

Submitted for: Benoit LOTT <>

Submitted on: Thursday, 5 January 2012 10:51:21

Updated on: Thursday, 5 January 2012 15:53:07