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26 April 2024 |
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The far emission region of the gamma-ray blazar PKS B1424-418 | | F. Tavecchio
; L. Pacciani
; I. Donnarumma
; A. Stamerra
; J. Isler
; E. MacPherson
; C. M. Urry
; | | Date: |
4 Jun 2013 | | Abstract: | We report multi-wavelength (IR-O, UV, X-ray, gamma-ray) data of the flat
spectrum radio quasar (FSRQ) PKS B1424-418 (z=1.52) gathered during an active
phase which occurred on 2013 April . As for a few other cases of FSRQs reported
in literature, the detection by the Large Area Telescope onboard Fermi of gamma
rays with energy above 10 GeV indicates that the emission likely occurs beyond
the highly opaque (tau ~10) broad line region. This conclusion is strengthened
by a model fit to the spectral energy distribution, which allows us to locate
the emission region even beyond the distance generally assumed for the dusty
torus. The consequent large size (~1 pc) inferred for the emission region
cannot account for the observed daily-scale variability of the gamma-ray flux.
We discuss the possibility that short-term variability results from fast
magnetic reconnection events, as proposed in recent works. | | Source: | arXiv, 1306.0734 | | Services: | Forum | Review | PDF | Favorites | |
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