Details

Autor(en) / Beteiligte

• Kovalev, Y. Y
• Aller, H. D
• Aller, M. F
• Homan, D. C
• Kadler, M
• Kellermann, K. I
• Kovalev, Yu. A
• Lister, M. L
• McCormick, M. J
• Pushkarev, A. B
• Ros, E
• Zensus, J. A

Titel

The Relation Between AGN Gamma-Ray Emission and Parsec-Scale Radio Jets

Ist Teil von

• The Astrophysical journal, 2009-05, Vol.696 (1), p.L17-L21

Ort / Verlag

IOP Publishing

Erscheinungsjahr

2009

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• 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 g-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 g-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 g-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 g-ray emission. This result becomes more pronounced for confirmed g-ray flaring sources. We identify the parsec-scale radio core as a likely location for both the g-ray and radio flares, which appear within typical timescales of up to a few months of each other.