Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view

Cutini, S.; Ciprini, S.; Orienti, M.; Tramacere, A.; D'Ammando, F.; Verrecchia, F.; Polenta, G.; Carrasco, L.; D'Elia, V.; Giommi, P.; Gonzalez-Nuevo, J.; Grandi, P.; Harrison, D.; Hays, E.; Larsson, S.; Lahteenmaki, A.; Leon-Tavares, J.; Lopez-Caniego, M.; Natoli, P.; Ojha, R.; Partridge, B.; Porras, A.; Reyes, L.; Recillas, E.; Torresi, E.

doi:10.1093/mnras/stu2011

Title: Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view

Journal Article · Fri Nov 07 00:00:00 EST 2014 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stu2011· OSTI ID:1356434

Cutini, S.; Ciprini, S.; Orienti, M.; Tramacere, A.; D'Ammando, F.; Verrecchia, F.; Polenta, G.; Carrasco, L.; D'Elia, V.; Giommi, P.; Gonzalez-Nuevo, J.; Grandi, P.; Harrison, D.; Hays, E.; Larsson, S.; Lahteenmaki, A.; Leon-Tavares, J.; Lopez-Caniego, M.; Natoli, P.; Ojha, R. more »

We report the Large Area Telescope on board the Fermi Gamma-ray Space Telescope detected a strong γ-ray flare on 2011 May 15 from a source identified as 4C +49.22, a flat spectrum radio quasar (FSRQ) also known as S4 1150+49. This blazar, characterized by a prominent radio–optical–X-ray jet, was in a low γ-ray activity state during the first years of Fermi observations. Simultaneous observations during the quiescent, outburst and post-flare γ-ray states were obtained by Swift, Planck and optical–IR–radio telescopes (Instituto Nacional de Astrofísica, Óptica y Electrónica, Catalina Sky Survey, Very Long Baseline Array [VLBA], Metsähovi). The flare is observed from microwave to X-ray bands with correlated variability and the Fermi, Swift and Planck data for this FSRQ show some features more typical of BL Lac objects, like the synchrotron peak in the optical band that outshines the thermal blue-bump emission, and the X-ray spectral softening. Multi-epoch VLBA observations show the ejection of a new component close in time with the GeV γ-ray flare. In conclusion, the radio-to-γ-ray spectral energy distribution is modelled and fitted successfully for the outburst and the post-flare epochs using either a single flaring blob with two emission processes (synchrotron self-Compton (SSC), and external-radiation Compton), and a two-zone model with SSC-only mechanism.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi-LAT Collaboration; Plank Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356434

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 445, Issue 4; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Examining High Energy Radiation Mechanisms of Knots and Hotspots in Active Galactic Nucleus Jets Zhang, Jin; Du, Shen-shi; Guo, Sheng-Chu arXiv https://doi.org/10.48550/arxiv.1803.08639	text	January 2018

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