Multiwavelength study of TeV blazar 1ES 1218+304 using gamma-ray, X-ray and optical observations

被引：5
作者：
Diwan, Rishank [1 ]
Prince, Raj [2 ]
Agarwal, Aditi [3 ,4 ]
Bose, Debanjan [5 ]
Majumdar, Pratik [6 ]
Ozdonmez, Aykut [7 ]
Chandra, Sunil [8 ,9 ]
Khatoon, Rukaiya [9 ]
Ege, Ergun [10 ]
机构：
[1] Univ Hong Kong, Lab Space Res, 405B Cyberport 4,100 Cyberport Rd, Hong Kong, Peoples R China
[2] Polish Acad Sci, Ctr Theoret Phys, Al Lotnikow 32-46, PL-02668 Warsaw, Poland
[3] SGT Univ, Ctr Cosmol & Sci Popularizat CCSP, Delhi 122006, India
[4] Raman Res Inst, CV Raman Ave, Bengaluru 560080, India
[5] Presidency Univ, Sch Astrophys, Kolkata 700073, India
[6] Saha Inst Nucl Phys, Kolkata 700064, West Bengal, India
[7] Ataturk Univ, Fac Sci, Dept Astron & Space Sci, TR-25240 Erzurum, Turkiye
[8] South African Astron Observ, Observ Rd, ZA-7925 Cape Town, South Africa
[9] North West Univ, Ctr Space Res, ZA-2520 Potchefstroom, South Africa
[10] Istanbul Univ, Fac Sci, Dept Astron & Space Sci, TR-34116 Istanbul, Turkiye
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2023年 / 524卷 / 03期
基金：
欧洲研究理事会;
关键词：
galaxies: active; galaxies: jets; gamma-rays: galaxies; radiation mechanisms: non-thermal; BL Lacertae objects: individual: 1ES 1218+304; SPACE-TELESCOPE OBSERVATIONS; LARGE-AREA TELESCOPE; PARTICLE-ACCELERATION; COSMIC-RAYS; LONG-TERM; INFRARED OBSERVATIONS; SPECTRAL VARIABILITY; NIR VARIABILITY; EMISSION REGION; PKS; 1510-089;
D O I：
10.1093/mnras/stad2088
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report on a multiwavelength study of the high-synchrotron-peaked BL Lac 1ES 1218+304 using near-simultaneous data obtained during the period from 2018 January 1 to 2021 May 31 (MJD 58119-59365) from various instruments, including Fermi-LAT, Swift-XRT, AstroSat, and optical data from Swift-UVOT and the TUBITAK observatory in Turkey. The source was reported to be flaring in the TeV & gamma;-ray band during 2019, but no significant variation was observed with Fermi-LAT. A sub-hour variability is seen in the SXT light curve, suggesting a compact emission region for the variability. However, hour-scale variability is observed in the & gamma;-ray light curve. A 'softer-when-brighter' trend is observed in the & gamma;-ray, and an opposite trend is seen in the X-ray, suggesting that the two emissions are produced through two different processes, as expected from a high-frequency-peaked BL Lac source. We have chosen the two epochs in 2019 January to study and compare their physical parameters. A joint fit of SXT and LAXPC provides a constraint on the synchrotron peak, estimated to be & SIM;1.6 keV. A clear shift in the synchrotron peak is observed from & SIM;1 keV to above 10 keV, revealing its extreme nature or behaviour like an extreme blazar-type source. The optical observation provides a colour-index variation as 'blue-when-brighter'. The broad-band spectral energy distribution is fitted with a single-zone synchrotron-self Compton model, and their parameters are discussed in the context of a TeV blazar and the possible mechanism behind the broad-band emission.
引用
收藏
页码：4333 / 4345
页数：13
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