The flat-spectrum radio quasar 3C 345 from the high to the low emission state

The flat-spectrum radio quasar 3C 345 from the high to the low emission state
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平谱射电类星体 3C 345 从高发射状态到低发射状态

DOI:
10.1051/0004-6361/201731625
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发表时间:
2017-07
影响因子:
6.5
通讯作者:
Rafanelli P
Rafanelli P
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Berton M;Liao N H;La Mura G;Jarvela E;Congiu E;Foschini L;Frezzato M;Ramakrishnan V;Fan X L;Lahteenmaki A;Pursimo T;Abate V;Bai J M;Calcidese P;Ciroi S;Chen L;Cracco V;Li S K;Tornikoski M;Rafanelli P

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本文报道了平谱射电类星体3C 345在射电、光学、紫外、x射线和γ射线等不同能量波段的同时观测结果。我们利用新数据和公共档案,构建了2008年费米天空调查开始至2016年不同频率下的光源光曲线。特别是我们获得了几个光谱,研究了不同活动状态下的发射谱线和连续谱的行为,并推导了黑洞的质量。3C 345在2009年显示了两次耀斑,同时发生在γ射线、光学/紫外和x射线中,后来又出现在无线电中。该源显示出逆康普顿主导的频谱能量分布,从高状态到低状态由高频率向低频率移动。在一次爆发事件中,发射线的混响使我们能够将γ射线的产生位置限制在非常接近宽线区域的位置,并且可能在喷流基地。我们报告了在突出后观察到的增加的吸积,可能是由于磁场强度相对于低状态的降低引起的。
We report simultaneous observations at different energy bands in radio, optical, UV, X-rays andγrays of the flat-spectrum radio-quasar 3C 345. We built the light curve of the source at different frequencies from 2008, the beginning of theFermiall-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 inγray, 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 ofγrays 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.
DOI: 10.1051/aas:1998297
发表时间: 1998-11
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