Variability and evolution of the optical polarization of a sample of gamma-ray blazars

被引：9

作者：

Otero-Santos, J. ^{[1
,2
]}

Acosta-Pulido, J. A. ^{[1
,2
]}

Gonzalez, J. Becerra ^{[1
,2
]}

Raiteri, C. M. ^{[3
]}

Carnerero, M., I ^{[3
]}

Segura, N. Castro ^{[2
,4
]}

Gonzalez-Martin, O. ^{[5
]}

Luashvili, A. ^{[6
]}

机构：

[1] Inst Astrofis Canarias IAC, E-38200 San Cristobal la Laguna, Tenerife, Spain

[2] Univ Laguna ULL, Dept Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain

[3] INAF Osservatorio Astrofisico Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy

[4] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, England

[5] Inst Radioastron & Astrofis IRyA UNAM, 3-72 Xangari, Morelia 8701, Mexico

[6] Univ Paris, Lab Univ & Theor,CNRS, Observ Paris, Unvers PSL, F-92190 Meudon, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 523卷 / 03期

关键词：

polarization; galaxies: active; BL Lacertae objects: general; galaxies: jets; galaxies: nuclei; MULTIWAVELENGTH BEHAVIOR; PLANE ROTATIONS; WEBT CAMPAIGN; INNER JET; ROBOPOL; MODEL; RADIO; FERMI; LONG; SPECTRA;

D O I：

10.1093/mnras/stad1722

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a polarization variability analysis of a sample of 26 & gamma;-ray blazars monitored by the Steward Observatory between 2008 and 2018 in the optical band. We investigate the properties and long-term variability of their optical polarization, searching for differences between blazar types. We observe that BL Lac objects are typically less polarized and less variable than flat spectrum radio quasars (FSRQs). Moreover, BL Lacs display a distribution of their polarization angle typically oriented in a preferential direction, contrary to the rather random distribution of FSRQs. For the latter blazar type, as well as those sources showing a bright stellar emission, we take into account the depolarizing effect introduced by the broad line region and the host galaxy on the measured polarization degree. In this sample, we also observe that BL Lacs present an uncorrelated evolution of the flux and the polarization. Contrary, FSRQs show a correlation before the depolarization correction, that is lost however after considering this effect. In addition, we study the behaviour of the polarization angle, searching for angle rotations in its long-term evolution. We derive that the FSRQs studied here show rotations more frequently than BL Lac objects by a factor & SIM;1.5. During these periods, we also observe a systematic decrease of the polarization fraction, as well as a marginal flux increase, not significant however to connect rotations with optical flares. We interpret these results within the extended shock-in-jet scenario, able to explain the overall features observed here for the polarization of the blazar sample.

引用

页码：4504 / 4519

页数：16

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