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

Abstract

The Large Area Telescope on board the Fermi Gamma-ray Space Telescope detected a strong gamma-ray flare on 2011 May 15 from a source identified as 4C 49.22, a flat spectrum radio quasar also known as S4 1150+49. This blazar, characterised by a prominent radio-optical-X-ray jet, was in a low gamma-ray activity state during the first years of Fermi observations. Simultaneous observations during the quiescent, outburst and post-flare gamma-ray states were obtained by Swift, Planck and optical-IR-radio telescopes (INAOE, Catalina CSS, VLBA, Metsahovi). 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 gamma-ray flare. The radio-to-gamma-ray spectral energy distribution is modeled and fitted successfully for the outburst and the post-flare epochs using either a single flaring blob with two emission processes (synchrotron self Compton, and external-radiation Compton), and a two-zone model with SSC-only mechanism.

20 pages, 12 figures and 12 tables and accepted by MNRAS

References in corpus (13)

• Probing the Inner Jet of the Quasar PKS 1510-089 with Multi-waveband Monitoring during Strong Gamma-ray Activity
• The VLA Low-frequency Sky Survey
• MOJAVE: Monitoring of Jets in AGN with VLBA Experiments. V. Multi-epoch VLBA Images
• Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
• Rapid variability in TeV blazars: the case of PKS 2155-304
• The Wilkinson Microwave Anisotropy Probe (WMAP) Source Catalog
• The Mexican Hat Wavelet Family. Application to point source detection in CMB maps
• On the geometry of broad emission region in quasars
• AGILE detection of extreme gamma-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis
• Comparison of filters for the detection of point sources in Planck simulations
• Non-blind catalogue of extragalactic point sources from the Wilkinson Microwave Anisotropy Probe (WMAP) first 3--year survey data
• Blind and non-blind source detection in WMAP 5-year maps
• A Modified Synchrotron Model for Knots in the M87 Jet

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• Broadband Study of High-Synchrotron-Peaked BL Lac Object 1ES 1218+304
• The $\gamma$-ray sky seen at X-ray energies I. Searching for the connection between X-rays and $\gamma$-rays in Fermi BL Lac objects
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