THE RELATION BETWEEN AGN GAMMA-RAY EMISSION AND PARSEC-SCALE RADIO JETS

被引：147

作者：

Kovalev, Y. Y. ^{[1
,2
]}

Aller, H. D. ^{[3
]}

Aller, M. F. ^{[3
]}

Homan, D. C. ^{[4
]}

Kadler, M. ^{[5
,6
,7
,8
]}

Kellermann, K. I. ^{[9
]}

Kovalev, Yu. A. ^{[2
]}

Lister, M. L. ^{[10
]}

McCormick, M. J. ^{[4
]}

Pushkarev, A. B. ^{[1
,11
,12
]}

Ros, E. ^{[1
,13
]}

Zensus, J. A. ^{[1
,9
]}

机构：

[1] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[2] PN Lebedev Phys Inst, Ctr Astro Space, Moscow 117997, Russia

[3] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[4] Denison Univ, Dept Phys & Astron, Granville, OH 43023 USA

[5] Univ Erlangen Nurnberg, Dr Remeis Sternwarte Bamberg, D-96049 Bamberg, Germany

[6] Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany

[7] NASA, Goddard Space Flight Ctr, CRESST, Greenbelt, MD 20771 USA

[8] Univ Space Res Assoc, Columbia, MD 21044 USA

[9] Natl Radio Astron Observ, Charlottesville, VA 22903 USA

[10] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

[11] Pulkovo Observ, St Petersburg 196140, Russia

[12] Crimean Astrophys Observ, UA-98409 Nauchnyi, Crimea, Ukraine

[13] Univ Valencia, Dept Astron & Astrofis, E-46100 Valencia, Spain

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 696卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxies: active; galaxies: jets; radio continuum: galaxies; ACTIVE GALACTIC NUCLEI; BLAZARS; QUASARS; OBJECTS; MOJAVE; IMAGES; MODEL;

D O I：

10.1088/0004-637X/696/1/L17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have compared the radio emission from a sample of parsec-scale active galactic nucleus (AGN) jets as measured by the VLBA at 15 GHz, with their associated. gamma-ray properties that are reported in the Fermi Large Area Telescope (LAT) three month bright source list. We find in our radio-selected sample that the. gamma-ray photon flux correlates well with the quasi-simultaneously measured compact radio flux density. The LAT-detected jets in our radio-selected complete sample generally have higher compact radio flux densities, and their parsec-scale cores are brighter (i.e., have higher brightness temperature) than the jets in the LAT nondetected objects. This suggests that the jets of bright. gamma-ray AGN have preferentially higher Doppler-boosting factors. In addition, AGN jets tend to be found in a more active radio state within several months from LAT-detection of their strong. gamma-ray emission. This result becomes more pronounced for confirmed. gamma-ray flaring sources. We identify the parsec-scale radio core as a likely location for both the. gamma-ray and radio flares, which appear within typical timescales of up to a few months of each other.

引用

页码：L17 / L21

页数：5

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