Exceptional outburst of the blazar CTA 102 in 2012: the GASP–WEBT campaign and its extension

Exceptional outburst of the blazar CTA 102 in 2012: the GASP–WEBT campaign and its extension

After several years of quiescence, the blazar CTA 102 underwent an exceptional outburst in 2012 September–October. The flare was tracked from γ-ray to near-infrared (NIR) frequencies, including Fermi and Swift data as well as photometric and polarimetric data from several observatories. An intensive...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2016-09, Vol.461 (3), p.3047-3056
Hauptverfasser: Larionov, V. M., Villata, M., Raiteri, C. M., Jorstad, S. G., Marscher, A. P., Agudo, I., Smith, P. S., Acosta-Pulido, J. A., ˙arévalo, M. J., Arkharov, A. A., Bachev, R., Blinov, D. A., Borisov, G., Borman, G. A., Bozhilov, V., Bueno, A., Carnerero, M. I., Carosati, D., Casadio, C., Chen, W. P., Clemens, D. P., Di Paola, A., Ehgamberdiev, Sh. A., Gómez, J. L., González-Morales, P. A., Griñón-Marín, A., Grishina, T. S., Hagen-Thorn, V. A., Ibryamov, S., Itoh, R., Joshi, M., Kopatskaya, E. N., Koptelova, E., Lázaro, C., Larionova, E. G., Larionova, L. V., Manilla-Robles, A., Metodieva, Y., Milanova, Yu. V., Mirzaqulov, D. O., Molina, S. N., Morozova, D. A., Nazarov, S. V., Ovcharov, E., Peneva, S., Ros, J. A., Sadun, A. C., Savchenko, S. S., Semkov, E., Sergeev, S. G., Strigachev, A., Troitskaya, Yu. V., Troitsky, I. S.
Format: Artikel
Sprache:eng
Schlagworte:
Blazars
Doppler effect
Emission
Emissions
Fluxes
Frequencies
Mathematical models
Outbursts
Stokes parameters
Synchrotrons
Ultraviolet radiation
X-ray astronomy
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container_issue 3
container_start_page 3047
container_title Monthly notices of the Royal Astronomical Society
container_volume 461
creator Larionov, V. M.
Villata, M.
Raiteri, C. M.
Jorstad, S. G.
Marscher, A. P.
Agudo, I.
Smith, P. S.
Acosta-Pulido, J. A.
˙arévalo, M. J.
Arkharov, A. A.
Bachev, R.
Blinov, D. A.
Borisov, G.
Borman, G. A.
Bozhilov, V.
Bueno, A.
Carnerero, M. I.
Carosati, D.
Casadio, C.
Chen, W. P.
Clemens, D. P.
Di Paola, A.
Ehgamberdiev, Sh. A.
Gómez, J. L.
González-Morales, P. A.
Griñón-Marín, A.
Grishina, T. S.
Hagen-Thorn, V. A.
Ibryamov, S.
Itoh, R.
Joshi, M.
Kopatskaya, E. N.
Koptelova, E.
Lázaro, C.
Larionova, E. G.
Larionova, L. V.
Manilla-Robles, A.
Metodieva, Y.
Milanova, Yu. V.
Mirzaqulov, D. O.
Molina, S. N.
Morozova, D. A.
Nazarov, S. V.
Ovcharov, E.
Peneva, S.
Ros, J. A.
Sadun, A. C.
Savchenko, S. S.
Semkov, E.
Sergeev, S. G.
Strigachev, A.
Troitskaya, Yu. V.
Troitsky, I. S.
description After several years of quiescence, the blazar CTA 102 underwent an exceptional outburst in 2012 September–October. The flare was tracked from γ-ray to near-infrared (NIR) frequencies, including Fermi and Swift data as well as photometric and polarimetric data from several observatories. An intensive Glast-Agile support programme of the Whole Earth Blazar Telescope (GASP–WEBT) collaboration campaign in optical and NIR bands, with an addition of previously unpublished archival data and extension through fall 2015, allows comparison of this outburst with the previous activity period of this blazar in 2004–2005. We find remarkable similarity between the optical and γ-ray behaviour of CTA 102 during the outburst, with a time lag between the two light curves of ≈1 h, indicative of cospatiality of the optical and γ-ray emission regions. The relation between the γ-ray and optical fluxes is consistent with the synchrotron self-Compton (SSC) mechanism, with a quadratic dependence of the SSC γ-ray flux on the synchrotron optical flux evident in the post-outburst stage. However, the γ-ray/optical relationship is linear during the outburst; we attribute this to changes in the Doppler factor. A strong harder-when-brighter spectral dependence is seen both the in γ-ray and optical non-thermal emission. This hardening can be explained by convexity of the UV–NIR spectrum that moves to higher frequencies owing to an increased Doppler shift as the viewing angle decreases during the outburst stage. The overall pattern of Stokes parameter variations agrees with a model of a radiating blob or shock wave that moves along a helical path down the jet.
doi_str_mv 10.1093/mnras/stw1516
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However, the γ-ray/optical relationship is linear during the outburst; we attribute this to changes in the Doppler factor. A strong harder-when-brighter spectral dependence is seen both the in γ-ray and optical non-thermal emission. This hardening can be explained by convexity of the UV–NIR spectrum that moves to higher frequencies owing to an increased Doppler shift as the viewing angle decreases during the outburst stage. 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N.</creatorcontrib><creatorcontrib>Morozova, D. A.</creatorcontrib><creatorcontrib>Nazarov, S. V.</creatorcontrib><creatorcontrib>Ovcharov, E.</creatorcontrib><creatorcontrib>Peneva, S.</creatorcontrib><creatorcontrib>Ros, J. A.</creatorcontrib><creatorcontrib>Sadun, A. C.</creatorcontrib><creatorcontrib>Savchenko, S. S.</creatorcontrib><creatorcontrib>Semkov, E.</creatorcontrib><creatorcontrib>Sergeev, S. G.</creatorcontrib><creatorcontrib>Strigachev, A.</creatorcontrib><creatorcontrib>Troitskaya, Yu. V.</creatorcontrib><creatorcontrib>Troitsky, I. S.</creatorcontrib><title>Exceptional outburst of the blazar CTA 102 in 2012: the GASP–WEBT campaign and its extension</title><title>Monthly notices of the Royal Astronomical Society</title><description>After several years of quiescence, the blazar CTA 102 underwent an exceptional outburst in 2012 September–October. The flare was tracked from γ-ray to near-infrared (NIR) frequencies, including Fermi and Swift data as well as photometric and polarimetric data from several observatories. An intensive Glast-Agile support programme of the Whole Earth Blazar Telescope (GASP–WEBT) collaboration campaign in optical and NIR bands, with an addition of previously unpublished archival data and extension through fall 2015, allows comparison of this outburst with the previous activity period of this blazar in 2004–2005. We find remarkable similarity between the optical and γ-ray behaviour of CTA 102 during the outburst, with a time lag between the two light curves of ≈1 h, indicative of cospatiality of the optical and γ-ray emission regions. The relation between the γ-ray and optical fluxes is consistent with the synchrotron self-Compton (SSC) mechanism, with a quadratic dependence of the SSC γ-ray flux on the synchrotron optical flux evident in the post-outburst stage. However, the γ-ray/optical relationship is linear during the outburst; we attribute this to changes in the Doppler factor. A strong harder-when-brighter spectral dependence is seen both the in γ-ray and optical non-thermal emission. This hardening can be explained by convexity of the UV–NIR spectrum that moves to higher frequencies owing to an increased Doppler shift as the viewing angle decreases during the outburst stage. The overall pattern of Stokes parameter variations agrees with a model of a radiating blob or shock wave that moves along a helical path down the jet.</description><subject>Blazars</subject><subject>Doppler effect</subject><subject>Emission</subject><subject>Emissions</subject><subject>Fluxes</subject><subject>Frequencies</subject><subject>Mathematical models</subject><subject>Outbursts</subject><subject>Stokes parameters</subject><subject>Synchrotrons</subject><subject>Ultraviolet radiation</subject><subject>X-ray astronomy</subject><issn>0035-8711</issn><issn>1365-2966</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><recordid>eNqF0ctKxDAUBuAgCo6XpfuAGzd1cnJr4m4cxgsICo64s6RpqpVOW5MULyvfwTf0SawzguDG1Vmcj5_D-RHaA3IIRLPxovEmjEN8BgFyDY2ASZFQLeU6GhHCRKJSgE20FcIjIYQzKkfobvZiXRertjE1bvuY9z5E3JY4Pjic1-bNeDydTzAQiqsGUwL0aLk7nVxffb5_3M6O59iaRWeq-wabpsBVDNi9RNeEIXQHbZSmDm73Z26jm5PZfHqWXFyenk8nF4kVwGLiBMuhBM2U5Ty3TIkiLVTKc0JZTpixacHAUkmVZhyY5tLo1NJcEVVwUTq2jQ5WuZ1vn3oXYraognV1bRrX9iEDxYQUPB3y_qeggYNWfKD7f-hj2_vhU0vFJNVK6EElK2V9G4J3Zdb5amH8awYk-y4mWxaT_RTze0Dbd__QL4etjVE</recordid><startdate>20160921</startdate><enddate>20160921</enddate><creator>Larionov, V. 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S.</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Meteorological &amp; Geoastrophysical Abstracts</collection><collection>Meteorological &amp; Geoastrophysical Abstracts - Academic</collection><jtitle>Monthly notices of the Royal Astronomical Society</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Larionov, V. M.</au><au>Villata, M.</au><au>Raiteri, C. M.</au><au>Jorstad, S. G.</au><au>Marscher, A. P.</au><au>Agudo, I.</au><au>Smith, P. S.</au><au>Acosta-Pulido, J. A.</au><au>˙arévalo, M. J.</au><au>Arkharov, A. A.</au><au>Bachev, R.</au><au>Blinov, D. A.</au><au>Borisov, G.</au><au>Borman, G. A.</au><au>Bozhilov, V.</au><au>Bueno, A.</au><au>Carnerero, M. I.</au><au>Carosati, D.</au><au>Casadio, C.</au><au>Chen, W. P.</au><au>Clemens, D. P.</au><au>Di Paola, A.</au><au>Ehgamberdiev, Sh. A.</au><au>Gómez, J. L.</au><au>González-Morales, P. A.</au><au>Griñón-Marín, A.</au><au>Grishina, T. S.</au><au>Hagen-Thorn, V. A.</au><au>Ibryamov, S.</au><au>Itoh, R.</au><au>Joshi, M.</au><au>Kopatskaya, E. N.</au><au>Koptelova, E.</au><au>Lázaro, C.</au><au>Larionova, E. G.</au><au>Larionova, L. V.</au><au>Manilla-Robles, A.</au><au>Metodieva, Y.</au><au>Milanova, Yu. V.</au><au>Mirzaqulov, D. O.</au><au>Molina, S. N.</au><au>Morozova, D. A.</au><au>Nazarov, S. V.</au><au>Ovcharov, E.</au><au>Peneva, S.</au><au>Ros, J. A.</au><au>Sadun, A. C.</au><au>Savchenko, S. S.</au><au>Semkov, E.</au><au>Sergeev, S. G.</au><au>Strigachev, A.</au><au>Troitskaya, Yu. V.</au><au>Troitsky, I. S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Exceptional outburst of the blazar CTA 102 in 2012: the GASP–WEBT campaign and its extension</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><date>2016-09-21</date><risdate>2016</risdate><volume>461</volume><issue>3</issue><spage>3047</spage><epage>3056</epage><pages>3047-3056</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><abstract>After several years of quiescence, the blazar CTA 102 underwent an exceptional outburst in 2012 September–October. The flare was tracked from γ-ray to near-infrared (NIR) frequencies, including Fermi and Swift data as well as photometric and polarimetric data from several observatories. An intensive Glast-Agile support programme of the Whole Earth Blazar Telescope (GASP–WEBT) collaboration campaign in optical and NIR bands, with an addition of previously unpublished archival data and extension through fall 2015, allows comparison of this outburst with the previous activity period of this blazar in 2004–2005. We find remarkable similarity between the optical and γ-ray behaviour of CTA 102 during the outburst, with a time lag between the two light curves of ≈1 h, indicative of cospatiality of the optical and γ-ray emission regions. The relation between the γ-ray and optical fluxes is consistent with the synchrotron self-Compton (SSC) mechanism, with a quadratic dependence of the SSC γ-ray flux on the synchrotron optical flux evident in the post-outburst stage. However, the γ-ray/optical relationship is linear during the outburst; we attribute this to changes in the Doppler factor. A strong harder-when-brighter spectral dependence is seen both the in γ-ray and optical non-thermal emission. This hardening can be explained by convexity of the UV–NIR spectrum that moves to higher frequencies owing to an increased Doppler shift as the viewing angle decreases during the outburst stage. The overall pattern of Stokes parameter variations agrees with a model of a radiating blob or shock wave that moves along a helical path down the jet.</abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stw1516</doi><tpages>10</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0035-8711
ispartof Monthly notices of the Royal Astronomical Society, 2016-09, Vol.461 (3), p.3047-3056
issn 0035-8711
1365-2966
language eng
recordid cdi_proquest_miscellaneous_1835654702
source Oxford Journals Open Access Collection
subjects Blazars
Doppler effect
Emission
Emissions
Fluxes
Frequencies
Mathematical models
Outbursts
Stokes parameters
Synchrotrons
Ultraviolet radiation
X-ray astronomy
title Exceptional outburst of the blazar CTA 102 in 2012: the GASP–WEBT campaign and its extension
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