دورية أكاديمية
The flat-spectrum radio quasar 3C 345 from the high to the low emission state
| العنوان: | The flat-spectrum radio quasar 3C 345 from the high to the low emission state |
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| المؤلفون: | Berton, M., Liao, N.H., La Mura, G., Congiu, E., Foschini, L., Frezzato, M., Ramakrishnan, V., Fan XL(范绪亮), Lähteenmäki, A., Pursimo, T., Abate, V., Bai JM(白金明), Calcidese, P., Ciroi, S., Chen, L., Cracco, V., Li SK(李少昆), Tornikoski, M., Rafanelli, P. |
| بيانات النشر: | EDP SCIENCES S A |
| سنة النشر: | 2018 |
| المجموعة: | Yunnan Observatories: YNAO OpenIR (Chinese Academy of Sciences, CAS) / 中国科学院云南天文台机构知识库 |
| مصطلحات موضوعية: | Galaxies: Jets, Quasars: Emission Lines, Quasars: Supermassive Black Holes, Quasars: Individual: 3c 345, 天文学, 天文学::天体物理学, 天文学::天体物理学::高能天体物理学, 理学, 理学::天文学, Astronomy & Astrophysics, Active Galactic Nuclei, Large-area Telescope, Gamma-ray Variability, Parsec-scale Jet, Relativistic Jets, Fermi Blazars, Black-hole, Region, Galaxies, 3c-345, Gamma Rays, 652.1.2military Aircraft - 657.2extraterrestrial Physics And Stellar Phenomena - 711electromagnetic Waves - 931.5gravitation, Relativity And String Theory - 932.1high Energy Physics |
| الوصف: | 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. |
| نوع الوثيقة: | article in journal/newspaper report |
| اللغة: | English |
| العلاقة: | ASTRONOMY & ASTROPHYSICS; http://ir.ynao.ac.cn/handle/114a53/12386Test; https://www.aanda.org/articles/aa/abs/2018/06/aa31625-17/aa31625-17.htmlTest |
| DOI: | 10.1051/0004-6361/201731625 |
| الإتاحة: | https://doi.org/10.1051/0004-6361/201731625Test http://ir.ynao.ac.cn/handle/114a53/12386Test https://www.aanda.org/articles/aa/abs/2018/06/aa31625-17/aa31625-17.htmlTest |
| رقم الانضمام: | edsbas.A883F34 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1051/0004-6361/201731625 |
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