arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.06512astro-ph.HEastro-ph.GA
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Blazar 3C 279的多波长行为:从$γ$射线到射电的十年研究

Multiwavelength behaviour of the blazar 3C279: decade-long study from $γ$-ray to radio

V. M. Larionov, S. G. Jorstad, A. P. Marscher, M. Villata, C. M. Raiteri, P. S. Smith, I. Agudo, S. S. Savchenko, D. A. Morozova, J. A. Acosta-Pulido, M. F. All… 展开作者

V. M. Larionov, S. G. Jorstad, A. P. Marscher, M. Villata, C. M. Raiteri, P. S. Smith, I. Agudo, S. S. Savchenko, D. A. Morozova, J. A. Acosta-Pulido, M. F. Aller, H. D. Aller, T. S. Andreeva, A. A. Arkharov, R. Bachev, G. Bonnoli, G. A. Borman, V. Bozhilov, P. Calcidese, M. I. Carnerero, D. Carosati, C. Casadio, W. -P. Chen, G. Damljanovic, A. V. Dementyev, A. Di Paola, A. Frasca, A. Fuentes, J. L. Gómez, P. Gónzalez-Morales, A. Giunta, T. S. Grishina, M. A. Gurwell, V. A. Hagen-Thorn, T. Hovatta, S. Ibryamov, M. Joshi, S. Kiehlmann, J. -Y. Kim, G. N. Kimeridze, E. N. Kopatskaya, Yu. A. Kovalev, Y. Y. Kovalev, O. M. Kurtanidze, S. O. Kurtanidze, A. Lähteenmäki, C. Lázaro, L. V. Larionova, E. G. Larionova, G. Leto, A. Marchini, K. Matsumoto, B. Mihov, M. Minev, M. G. Mingaliev, D. Mirzaqulov, R. V. Muñoz Dimitrova, I. Myserlis, A. A. Nikiforova, M. G. Nikolashvili, N. A. Nizhelsky, E. Ovcharov, L. D. Pressburger, I. A. Rakhimov, S. Righini, N. Rizzi, K. Sadakane, A. C. Sadun, M. R. Samal, R. Z. Sanchez, E. Semkov, S. G. Sergeev, L. A. Sigua, L. Slavcheva-Mihova, P. Sola, Yu. V. Sotnikova, A. Strigachev, C. Thum, E. Traianou, Yu. V. Troitskaya, I. S. Troitsky, P. G. Tsybulev, A. A. Vasilyev, O. Vince, Z. R. Weaver, K. E. Williamson, G. V. Zhekanis

摘要:

我们报告了blazar 3C 279长达十年(2008-2018)的$γ$射线至1 GHz射电监测结果,包括GASP/WEBT,$\it{Fermi}$和$\it{Swift}$数据,以及偏振和光谱数据。X-射线和$γ$ -射线光变曲线相关性良好,没有> 3小时的延迟,这意味着发射区域的一般共空间性。$γ$ -射线-光通量-通量关系随活动状态而变化,范围从线性到更复杂的依赖性。斯托克斯参数在光波长和无线电波长,包括43 GHz VLBA图像的行为,支持无论是一个主要的螺旋磁场或运动的辐射等离子体沿螺旋路径。发射结的表观速度范围从10至37 C,最高值需要大量的洛伦兹因子接近那些需要解释$γ$ -射线的变化在很短的时间尺度。Mg II发射线通量的“蓝色”和“红色”的翅膀与光学同步辐射连续通量密度,可能提供一个变量源的种子光子逆康普顿散射。在无线电波段中,我们发现最突出的光曲线最大值随着频率的降低而逐渐延迟,正如同步加速器自吸收的$τ=1$表面的频率依赖性所预期的那样。86 GHz光变曲线中的全局最大值在较低频率下变得不那么突出,而出现在2014年的局部最大值朝着降低的频率增强,在$\sim5$ GHz变得明显。这些趋势表明,不同的多普勒助推分层无线电发射区的射流。

英文摘要:

We report the results of decade-long (2008-2018) $γ$-ray to 1 GHz radio monitoring of the blazar 3C 279, including GASP/WEBT, $\it{Fermi}$ and $\it{Swift}$ data, as well as polarimetric and spectroscopic data. The X-ray and $γ$-ray light curves correlate well, with no delay > 3 hours, implying general co-spatiality of the emission regions. The $γ$-ray-optical flux-flux relation changes with activity state, ranging from a linear to a more complex dependence. The behaviour of the Stokes parameters at optical and radio wavelengths, including 43 GHz VLBA images, supports either a predominantly helical magnetic field or motion of the radiating plasma along a spiral path. Apparent speeds of emission knots range from 10 to 37c, with the highest values requiring bulk Lorentz factors close to those needed to explain $γ$-ray variability on very short time scales. The Mg II emission line flux in the `blue' and `red' wings correlates with the optical synchrotron continuum flux density, possibly providing a variable source of seed photons for inverse Compton scattering. In the radio bands we find progressive delays of the most prominent light curve maxima with decreasing frequency, as expected from the frequency dependence of the $τ=1$ surface of synchrotron self-absorption. The global maximum in the 86 GHz light curve becomes less prominent at lower frequencies, while a local maximum, appearing in 2014, strengthens toward decreasing frequencies, becoming pronounced at $\sim5$ GHz. These tendencies suggest different Doppler boosting of stratified radio-emitting zones in the jet.

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