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arXiv 2203.02672astro-ph.HE
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Blazar TXS 1700+685的宽带谱时研究

Broadband Spectro-temporal Study on Blazar TXS 1700+685

Anuvab Banerjee, Prantik Nandi, Raj Prince, Rukaiya Khatoon, Debanjan Bose

摘要:

我们试图提出一个多波长的可变性和相关性的研究,以及详细的多波段光谱特征的2021年5月$γ$射线耀斑的耀变体源TXS 1700+685。利用\textit{Fermi} -LAT、\textit{Swift} -XRT/UVOT的多波长观测资料以及射电档案资料进行了谱时研究。根据\textit{Fermi} -LAT观测中观测到的不同耀斑区的通量倍增时间,我们估计了源的变率时间尺度,并利用最短的变率时间来约束最小多普勒因子和发射区的大小。我们在$\sim$ 17天时检测到统计学上显著的准周期振荡特征(QPO)。用轻子同步加速器和逆康普顿分量满意地描述了耀斑状态下的宽带辐射。从宽带光谱建模,我们观察到的种子光子的外部康普顿化起源于宽线区域占主导地位相比,尘埃环面。这进一步得到了以下事实的支持,即发射区域也被发现位于BLR内。该均分值意味着射流共动系中磁场的能量密度较弱,这也反映在射流的磁场分量所对应的磁场和功率较低上。为了产生高能峰,我们需要注入大量的高能电子和/或存在强磁场;我们观察到后一个分量在我们的情况下是次主导的。$γ$射线SED中的平坦上升和陡峭下降轮廓以及在$\sim$ 1 GeV处的谱弯曲或突变与源的平坦谱射电类星体(FSRQ)性质相一致。

英文摘要:

We attempt to present a multiwavelength variability and correlation study as well as detailed multi-waveband spectral characteristics of the May 2021 $γ$-ray flare of the blazar source TXS 1700+685. The multi-wavelength observation from \textit{Fermi}-LAT, \textit{Swift}-XRT/UVOT as well as radio archival data are used for our spectro-temporal investigation. We estimate the variability time-scale of the source from the flux doubling time in different flaring regions detected in \textit{Fermi}-LAT observation and the shortest variability time is used to put a constraint on the minimum Doppler factor and on the size of the emission region. We have detected a statistically significant quasi-periodic oscillation feature (QPO) at $\sim$ 17 days. The broad-band emission is satisfactorily represented during its flaring state with a leptonic synchrotron and inverse Compton component. From the broadband spectral modeling, we observe the external Comptonization of the seed photons originating in the broad line region to be dominant compared to the dusty torus. This is further supported by the fact that the emission region is also found to be residing within the BLR. The equipartition value implies the energy density of the magnetic field in the jet comoving frame is weak, and that is also reflected in the magnetic field and low power corresponding to the magnetic field component of the jet. In order to produce the high energy hump, we need the injection of a large population of high energy electrons and/or the presence of strong magnetic field; and we observe the later component to be sub-dominant in our case. The flat rising and steep falling profile in the $γ$-ray SED as well as the break or spectral curvature at $\sim$ 1 GeV are in commensuration with the flat-spectrum radio quasar (FSRQ) nature of the source.

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