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

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), andmore » a two-zone model with SSC-only mechanism.« less
Authors:
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Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 445; Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Fermi-LAT Collaboration; Plank Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: jets; quasars: general; quasars: individual: 4C +49.22; gamma-rays: galaxies; X-rays: galaxies
OSTI Identifier:
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., Partridge, B., Porras, A., Reyes, L., Recillas, E., and Torresi, E.. Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view. United States: N. p., Web. doi:10.1093/mnras/stu2011.
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.. Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view. United States. doi:10.1093/mnras/stu2011.
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., and Torresi, E.. 2014. "Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view". United States. doi:10.1093/mnras/stu2011. https://www.osti.gov/servlets/purl/1356434.
@article{osti_1356434,
title = {Radio-gamma-ray connection and spectral evolution in 4C +49.22 (S4 1150+49): the Fermi, Swift and Planck view},
author = {Cutini, S. and Ciprini, S. and Orienti, M. and Tramacere, A. and D'Ammando, F. and Verrecchia, F. and Polenta, G. and Carrasco, L. and D'Elia, V. and Giommi, P. and Gonzalez-Nuevo, J. and Grandi, P. and Harrison, D. and Hays, E. and Larsson, S. and Lahteenmaki, A. and Leon-Tavares, J. and Lopez-Caniego, M. and Natoli, P. and Ojha, R. and Partridge, B. and Porras, A. and Reyes, L. and Recillas, E. and Torresi, E.},
abstractNote = {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.},
doi = {10.1093/mnras/stu2011},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 445,
place = {United States},
year = {2014},
month = {11}
}