Intra-night optical flux and polarization variability of BL Lacertae during its 2020-2021 high state

被引：17

作者：

Bachev, Rumen ^{[1
]}

Tripathi, Tushar ^{[2
,3
]}

Gupta, Alok C. ^{[2
,4
]}

Kushwaha, Pankaj ^{[5
]}

Strigachev, Anton ^{[1
]}

Kurtenkov, Alexander ^{[1
]}

Nikolov, Yanko ^{[1
]}

Boeva, Svetlana ^{[1
]}

Damljanovic, Goran

Vince, Oliver ^{[6
]}

Stojanovic, Milan ^{[6
]}

Kishore, Shubham ^{[2
,3
]}

Gaur, Haritma ^{[2
]}

Dhiman, Vinit ^{[2
,7
]}

Fan, Junhui ^{[8
,9
]}

Kalita, Nibedita ^{[10
]}

Spassov, Borislav ^{[1
]}

Semkov, Evgeni ^{[1
]}

机构：

[1] Bulgarian Acad Sci, Inst Astron & NAO, Sofia 1784, Bulgaria

[2] Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263001, Uttaranchal, India

[3] DDU Gorakhpur Univ, Dept Phys, Gorakhpur 273009, Uttar Pradesh, India

[4] Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, Shanghai 200030, Peoples R China

[5] Indian Inst Sci Educ & Res IISER Mohali, Dept Phys Sci, Sect 81, SAS Nagar 140306, Punjab, India

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

[7] Pt Ravishankar Shukla Univ, Sch Studies Phys & Astrophys, Amanaka GE Rd, Raipur 492010, Chhattisgarh, India

[8] Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Peoples R China

[9] Astron Sci & Technol Res Lab, Dept Educ Guangdong Prov, Guangzhou 510006, Peoples R China

[10] Polar Res Inst China, Key Lab Polar Sci, MNR, 451 Jinqiao Rd, Shanghai 200135, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 522卷 / 02期

关键词：

BL Lacertae objects: general; BL Lacertae objects: individual: BL Lacertae; QUASI-PERIODIC OSCILLATIONS; OBJECT S5 0716+714; BLAZAR OJ 287; RELATIVISTIC JETS; MICROVARIABILITY OBSERVATIONS; SPECTRAL VARIABILITY; ANGLE SWINGS; RADIO-LOUD; BROAD-BAND; S4 0954+65;

D O I：

10.1093/mnras/stad1063

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this work, we report the presence of rapid intra-night optical variations in both flux and polarization of the blazar BL Lacertae during its unprecedented 2020-2021 high state of brightness. The object showed significant flux variability and some colour changes, but no firmly detectable time delays between the optical bands. The linear polarization was also highly variable in both polarization degree and angle (electric vector polarization angle). The object was observed from several observatories throughout the world, covering a total of almost 300 h during 66 nights. Based on our results, we suggest that the changing Doppler factor of an ensemble of independent emitting regions, travelling along a curved jet that at some point happens to be closely aligned with the line of sight, can successfully reproduce our observations during this outburst. This is one of the most extensive variability studies of the optical polarization of a blazar on intra-night time-scales.

引用

页码：3018 / 3035

页数：18

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