Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-02-12
The Astrophysical Journal Letters 696 (2009) L17-L21
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
5 pages, 5 figures, accepted for publication in the Astrophysical Journal Letters; title is changed, minor corrections of the
Scientific paper
10.1088/0004-637X/696/1/L17
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 LAT non-detected 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.
Aller Hugh D.
Aller Margo F.
Homan Daniel C.
Kadler Matthias
Kellermann Kenneth I.
No associations
LandOfFree
On the relation between AGN gamma-ray emission and parsec-scale radio jets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the relation between AGN gamma-ray emission and parsec-scale radio jets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the relation between AGN gamma-ray emission and parsec-scale radio jets will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-556312