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26 April 2024 |
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Article overview
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Early Fermi gamma-ray detections of AGN: a strong connection with parsec-scale VLBA jet properties | | Y. Y. Kovalev
; H. D. Aller
; M. F. Aller
; D. C. Homan
; M. Kadler
; K. I. Kellermann
; Yu. A. Kovalev
; M. L. Lister
; M. J. McCormick
; A. B. Pushkarev
; E. Ros
; J. A. Zensus
; | | Date: |
12 Feb 2009 | | Abstract: | 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. | | Source: | arXiv, 0902.2085 | | Services: | Forum | Review | PDF | Favorites | |
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