MULTIFREQUENCY PHOTO-POLARIMETRIC WEBT OBSERVATION CAMPAIGN ON THE BLAZAR S5 0716+714: SOURCE MICROVARIABILITY AND SEARCH FOR CHARACTERISTIC TIMESCALES

被引：41

作者：

Bhatta, G. ^{[1
]}

Stawarz, L. ^{[1
]}

Ostrowski, M. ^{[1
]}

Markowitz, A. ^{[2
]}

Akitaya, H. ^{[3
]}

Arkharov, A. A. ^{[4
]}

Bachev, R. ^{[5
]}

Benitez, E. ^{[6
]}

Borman, G. A. ^{[7
]}

Carosati, D. ^{[8
,9
]}

Cason, A. D. ^{[10
]}

Chanishvili, R. ^{[11
]}

Damljanovic, G. ^{[12
]}

Dhalla, S. ^{[13
]}

Frasca, A. ^{[14
]}

Hiriart, D. ^{[15
]}

Hu, S-M. ^{[16
]}

Itoh, R. ^{[17
]}

Jableka, D. ^{[1
]}

Jorstad, S. ^{[18
,19
]}

Jovanovic, M. D. ^{[12
]}

Kawabata, K. S. ^{[3
]}

Klimanov, S. A. ^{[4
]}

Kurtanidze, O. ^{[11
,20
,21
]}

Larionov, V. M. ^{[4
,19
]}

Laurence, D. ^{[13
]}

Leto, G. ^{[14
]}

Marscher, A. P. ^{[18
]}

Moody, J. W. ^{[22
]}

Moritani, Y. ^{[23
]}

Ohlert, J. M. ^{[24
]}

Di Paola, A. ^{[25
]}

Raiteri, C. M. ^{[26
]}

Rizzi, N. ^{[27
]}

Sadun, A. C. ^{[28
]}

Sasada, M. ^{[18
]}

Sergeev, S. ^{[7
]}

Strigachev, A. ^{[5
]}

Takaki, K. ^{[17
]}

Troitsky, I. S. ^{[19
]}

Ui, T. ^{[17
]}

Villata, M. ^{[26
]}

Vince, O. ^{[12
]}

Webb, J. R. ^{[13
]}

Yoshida, M. ^{[3
]}

Zola, S. ^{[1
,29
]}

机构：

[1] Jagiellonian Univ, Astron Observ, Ul Orla 171, PL-30244 Krakow, Poland

[2] Univ Calif San Diego, Ctr Astrophys & Space Sci, 9500 Gilman Dr, La Jolla, CA 92093 USA

[3] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan

[4] RAS, Main Pulkovo Astron Observ, Pulkovskoye Shosse 60, St Petersburg 196140, Russia

[5] Bulgarian Acad Sci, Inst Astron, 72 Tsarigradsko Shosse Blvd, Sofia 1784, Bulgaria

[6] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City, DF, Mexico

[7] Crimean Astrophys Observ, P O Nauchny, Crimea 298409, Russia

[8] EPT Observ, Tijarafe, La Palma, Spain

[9] INAF, TNG Fdn Galileo Galilei, La Palma, Spain

[10] 105 Glen Pine Trail, Dawnsonville, GA 30534 USA

[11] Abastumani Observ, Mt Kanobili 0301, Abastumani, Georgia

[12] Astron Observ, Volgina 7, Belgrade 11060, Serbia

[13] Florida Int Univ, Miami, FL 33199 USA

[14] INAF, Osservatorio Astrofis Catania, Catania, Italy

[15] Univ Nacl Autonoma Mexico, Inst Astron, Ensenada, Baja California, Mexico

[16] Shandong Univ Weihai, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Inst Space Sci, Weihai 264209, Peoples R China

[17] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan

[18] Boston Univ, Inst Astrophys Res, 725 Commonwealth Ave, Boston, MA 02215 USA

[19] St Petersburg State Univ, Astron Inst, Univ Skij Pr 28, St Petersburg 198504, Russia

[20] Kazan Fed Univ, Engelhardt Astron Observ, Tatarstan, Russia

[21] Landessternwarte Heidelberg Konigstuhl, Heidelberg, Germany

[22] Brigham Young Univ, Dept Phys & Astron, N283 ESC, Provo, UT 84602 USA

[23] Univ Tokyo, Kavli Inst Phys & Math Univ KavliI PMU, 5-1-5 Kashiwa No Ha, Kashiwa City, Chiba 2778583, Japan

[24] Astron Stiftung Tebur, Fichtenstr 7, D-65468 Trebur, Germany

[25] INAF, Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy

[26] INAF, Osservatorio Astrofis Torino, Turin, Italy

[27] Sirio Astron Observ Castellana Grotte, Castellana Grotte, Italy

[28] Univ Colorado, Dept Phys, Denver, CO 80202 USA

[29] Pedag Univ, Mt Suhora Observ, Ul Podchorazych 2, PL-30084 Krakow, Poland

来源：

ASTROPHYSICAL JOURNAL | 2016年 / 831卷 / 01期

基金：

中国国家自然科学基金; 美国国家科学基金会;

关键词：

acceleration of particles; BL Lacertae objects: individual (S5 0716+714); galaxies: active; galaxies: jets; polarization; radiation mechanisms: non-thermal; BL-LACERTAE OBJECTS; INTRADAY OPTICAL VARIABILITY; ACTIVE GALACTIC NUCLEI; POLARIZATION VARIABILITY; X-RAY; INNER JET; SPECTRAL VARIABILITY; LIGHT CURVES; RADIO; OUTBURST;

D O I：

10.3847/0004-637X/831/1/92

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Here we report on the results of the Whole Earth Blazar Telescope photo-polarimetric campaign targeting the blazar S5. 0716+71, organized in 2014 March to monitor the source simultaneously in BVRI and near-IR filters. The campaign resulted in an unprecedented data set spanning similar to 110 hr of nearly continuous, multiband observations, including two sets of densely sampled polarimetric data mainly in the R. filter. During the campaign, the source displayed pronounced variability with peak-to-peak variations of about 30% and "bluer-when-brighter" spectral evolution, consisting of a day-timescale modulation with superimposed hour-long microflares characterized by similar to 0.1 mag flux changes. We performed an in-depth search for quasi-periodicities in the source light curve; hints for the presence of oscillations on timescales of similar to 3 and similar to 5 hr do not represent highly significant departures from a pure red-noise power spectrum. We observed that, at a certain configuration of the optical polarization angle (PA) relative to the PA of the innermost radio jet in the source, changes in the polarization degree (PD) led the total flux variability by about 2 hr; meanwhile, when the relative configuration of the polarization and jet angles altered, no such lag could be noted. The microflaring events, when analyzed as separate pulse emission components, were found to be characterized by a very high PD (>30%) and PAs that differed substantially from the PA of the underlying background component, or from the radio jet positional angle. We discuss the results in the general context of blazar emission and energy dissipation models.

引用

页数：17

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