Early Fermi gamma-ray detections of AGN: a strong connection with parsec-scale VLBA jet properties
Early Fermi gamma-ray detections of AGN: a strong connection with parsec-scale VLBA jet properties
复制标题
DOI：
10.1088/0004-637x/696/1/l17
复制
发表时间：
2009-02
期刊：
影响因子：
--
通讯作者：
Y. Kovalev;H. Aller;A. Pushkarev;M. Aller;E. Ros;D. Homan;Y. Kovalev;K. Kellermann;M. Lister;M. J. McCormick;M. Kadler;J. Zensus
中科院分区：
文献类型：
--
作者：
Y. Kovalev;H. Aller;A. Pushkarev;M. Aller;E. Ros;D. Homan;Y. Kovalev;K. Kellermann;M. Lister;M. J. McCormick;M. Kadler;J. Zensus
We have compared the radio emission from a sample of parsec-scale AGN jets as measured by the VLBA at 15 GHz, with their associated gamma-ray properties that are reported in the Fermi LAT 3-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 non-LAT detected objects. This suggests that the jets of bright gamma-ray AGN have preferentially higher Doppler-boosting factors. In addition, jets of the LAT-detected AGN tend to be in a more active radio state, when quasi-simultaneous data are used. 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.
