Rapid high-amplitude gamma-ray variability in Blazar PKS 0507+17

Abstract

We report a detailed analysis of $\gamma$-ray data of 2FGL J0509.9+1802 observed by the Large Area Telescope on board {\it Fermi} satellite, especially focusing on April 2013 when extraordinary $\gamma$-ray variability has been detected. Localization of $\gamma$-ray emission during this epoch suggests that the $\gamma$-ray source only associates with PKS 0507+17. The $\gamma$-ray emission of PKS 0507+17 is identified at the first time. The daily peak flux is over two orders of magnitude higher than the first two-year average flux, giving an isotropic $\gamma$-ray luminosity of $\simeq 4\times 10^{48}$ erg ${\mathrm{s}}^{-1}$. Rapid $\gamma$-ray variability with doubling time of 2-3 hours has been detected. Such a short doubling timescale has been detected for only a few bright blazars and indicates a location of $\gamma$-ray emission inside the broad line region. Together with the bluer-when-brighter $\gamma$-ray spectra, the variability phenomena could be well explained by the classic flat-spectrum radio quasar variability model that includes a fast injection of accelerated electrons and the external Compton cooling process.

Accepted for publication in New Astronomy

References in corpus (8)

• CRATES: An All-Sky Survey of Flat-Spectrum Radio Sources
• MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
• CGRaBS: An All-Sky Survey of Gamma-Ray Blazar Candidates
• Implications of very rapid TeV variability in blazars
• A Universal Scaling for the Energetics of Relativistic Jets From Black Hole Systems
• GeV breaks in blazars as a result of gamma-ray absorption within the broad-line region
• Detection of significant cm to sub-mm band radio and gamma-ray correlated variability in Fermi bright blazars
• The curvature of spectral energy distribution of blazars

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• Constraining X-ray emission in HBL blazars using multiwavelength observations