Long-term multi-wavelength variations of Fermi blazar 3C 279
Long-term multi-wavelength variations of Fermi blazar 3C 279
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费米 Blazar 3C 279 的长期多波长变化
DOI：
10.1088/1674-4527/21/8/186
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发表时间：
2021-03
影响因子：
1.8
通讯作者：
Dai Benzhong
中科院分区：
文献类型：
--
作者：
Zhang Bingkai;Jin Min;Zhao Xiaoyun;Zhang Li;Dai Benzhong
Blazar 3C 279的长期光学、X射线和X射线数据来自Swift-XRT、RXTE-PCA、Fermi-LAT、SMARTS和文献。该源在长时间尺度上表现出很强的变异性。从20世纪80年代至今，R波段的光变曲线跨度超过32年，其中发现了一个可能长达5.6年的准周期变化分量，并对其光谱行为进行了研究。在光学波段，平均光谱指数为-1.71。该光源具有明显的特殊光谱特性。在低态下，光源表现出明显的越亮越蓝的特性，即光谱随着亮度的增加而变硬（变平）;而在高态下，光谱是稳定的，这意味着光源的光谱指数不随亮度而变化。对光学、X射线和γ射线能带进行了相关分析。结果表明，γ射线和X射线波段的变化在天的时间尺度上具有很好的相关性，而与光学波段的相关性较弱。变化，特别是爆发，是同时发生的，但变化的幅度是不成比例的。详细分析表明，主爆发在不同的γ射线，X射线和光学波段表现出很强的相关性。
Long-term optical, X-ray and -ray data of blazar 3C 279 have been compiled from Swift-XRT, RXTE-PCA, Fermi-LAT, SMARTS and literature. The source exhibits strong variability on long timescales. From the 1980s until now, the optical R band light curve spans more than 32 yr, and a possible 5.6- yr-long quasi-periodic variation component has been found in it. The optical spectral behavior has been investigated. In the optical band, the mean spectral index is –1.71. The source exhibits an obvious special spectral behavior. In the low state, the sourcemanifests a clear bluer-when-brighter behavior in the sense that the optical spectrum turns harder (flatter) when the brightness increases.While in the high state, the optical spectrum is stable, which means the source spectral index does not vary with brightness. The correlation analysis has been performed among optical, X-ray and γ-ray energy bands. The result indicates that the variations of γ-ray and X-ray bands are well correlated without time delay on the timescale of days, and their variations exhibitweak correlationswith those of the optical band. The variations, especially outbursts, are simultaneous, but the magnitude of variations is disproportionate. The detailed analysis reveals that the main outbursts exhibit strong correlations in different γ-ray, X-ray and optical bands.
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影响因子：
64.8
作者：
C. Raiteri;M. Villata;J. Acosta-Pulido;I. Agudo;A. Arkharov;R. Bachev;G. V. Baida;E. Benítez-
通讯作者：
C. Raiteri;M. Villata;J. Acosta-Pulido;I. Agudo;A. Arkharov;R. Bachev;G. V. Baida;E. Benítez-
DOI：
10.3847/0004-6256/151/3/54
发表时间：
2015-12
期刊：
The Astronomical Journal
影响因子：
--
作者：
A. Sandrinelli;S. Covino;M. Dotti;Aldo Treves
通讯作者：
A. Sandrinelli;S. Covino;M. Dotti;Aldo Treves
影响因子：
4.8
作者：
J. Otero-Santos;J. Otero-Santos;J. Acosta-Pulido;J. Acosta-Pulido;J. B. González;J. B. González
通讯作者：
J. Otero-Santos;J. Otero-Santos;J. Acosta-Pulido;J. Acosta-Pulido;J. B. González;J. B. González
DOI：
10.3847/1538-4357/aa79fc
发表时间：
2017-06
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. Isler;C. Urry;P. Coppi;C. Bailyn;M. Brady;E. MacPherson;M. Buxton;Ikramul Hasan
通讯作者：
J. Isler;C. Urry;P. Coppi;C. Bailyn;M. Brady;E. MacPherson;M. Buxton;Ikramul Hasan
DOI：
10.1088/0004-637x/760/2/129
发表时间：
2012-10
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Janiak;M. Sikora;K. Nalewajko;R. Moderski;G. Madejski
通讯作者：
M. Janiak;M. Sikora;K. Nalewajko;R. Moderski;G. Madejski