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The flat-spectrum radio quasar 3C 345 from the high to the low emission state
Berton, M.1,2; Liao, N.H.3; La Mura, G.1; La Mura, G.4,5; Congiu, E.1,2; Foschini, L.2; Frezzato, M.1; Ramakrishnan, V.6; Fan XL(范绪亮)7,8; Lähteenmäki, A.4,5; Pursimo, T.8; Abate, V.1; Bai, J.M.7; Calcidese, P.9; Ciroi, S.1; Chen, L.10; Cracco, V.1; Li, S.K.7; Tornikoski, M.4; Rafanelli, P.1
发表期刊Astronomy and Astrophysics
2018-06-01
卷号614
DOI10.1051/0004-6361/201731625
产权排序第7完成单位
收录类别EI
摘要We report simultaneous observations at different energy bands in radio, optical, UV, X-rays and γ rays of the flat-spectrum radio-quasar 3C 345. We built the light curve of the source at different frequencies from 2008, the beginning of the Fermi all-sky survey, to 2016, using new data and public archives. In particular we obtained several optical spectra, to study the behavior of emission lines and the continuum in different activity states and to derive the black hole mass. 3C 345 showed two flaring episodes in 2009, which occurred simultaneously in γ ray, optical/UV and X-rays, and were later followed in radio. The source shows an inverse Compton dominated spectral energy distribution, which moved from higher to lower frequencies from the high to the low state. The reverberation of emission lines during one outburst event allowed us to constrain the location of production of γ rays very close to the broad-line region, and possibly in the jet-base. We report the observation of an increased accretion after the outburst, possibly induced by the decrease of magnetic field intensity with respect to the low state.
语种英语
学科领域天文学
文章类型Journal article (JA)
ISSN0004-6361
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12386
专题丽江天文观测站(南方基地)
作者单位1.Dipartimento di Fisica e Astronomia 'G. Galilei', Università di Padova, Vicolo dell'Osservatorio 3, Padova; 35122, Italy
2.INAF, Osservatorio Astronomico di Brera, via E. Bianchi 46, Merate (LC); 23807, Italy
3.Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, Nanjing; 210008, China
4.Aalto University Metsähovi Radio Observatory, Metsähovintie 114, Kylmälä; 02540, Finland
5.Aalto University Department of Radio Science and Engineering, Aalto; 00076, Finland
6.Universidad de Concepción, Departamento de Astronomía, Casilla 160-C, Concepción, Chile
7.Yunnan Observatories, Chinese Academy of Sciences, Kunming, Yunnan; 650011, China
8.School of Physics, Huazhong University of Science and Technology, Wuhan; 430074, China
9.Nordic Optical Telescope, Apartado 474, Santa Cruz de La Palma; 38700, Spain
10.Osservatorio Astronomico della Regione Autonoma Valle d'Aosta, Saint Barthelemy, Nus; 11020, Italy
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Berton, M.,Liao, N.H.,La Mura, G.,et al. The flat-spectrum radio quasar 3C 345 from the high to the low emission state[J]. Astronomy and Astrophysics,2018,614.
APA Berton, M..,Liao, N.H..,La Mura, G..,La Mura, G..,Congiu, E..,...&Rafanelli, P..(2018).The flat-spectrum radio quasar 3C 345 from the high to the low emission state.Astronomy and Astrophysics,614.
MLA Berton, M.,et al."The flat-spectrum radio quasar 3C 345 from the high to the low emission state".Astronomy and Astrophysics 614(2018).
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