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arXiv 2103.00292astro-ph.HEastro-ph.COastro-ph.GA
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星环加速器?IceCube候选物PKS 1502+106中的异常喷流动力学

A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106

Silke Britzen, Michal Zajaček, Luka Č. Popović, Christian Fendt, Andrea Tramacere, Ilya N. Pashchenko, Frédéric Jaron, Radim Pánis, Leonid Petrov, Margo F. Aller, Hugh D. Aller

摘要:

2019/07/30.86853 UT,IceCube探测到一个高能天体物理中微子候选者。平谱射电类星体PKS 1502+106位于事件的50%不确定区域内。我们的分析15 GHz甚长基线阵列(VLBA)和天体测量8 GHz VLBA数据,在一个时间跨度之前和之后的冰立方事件,揭示了一个无线电环结构,随着时间的推移发展的证据。垂直于喷流脊线方向演化出若干弧形结构。我们发现的运动学建模和周期性分析的基础上进动的弯曲射流的证据。根据Sloan数字巡天(SDSS)的CIV谱线观测,发现了一个流出宽线区(BLR),并将其归因于旋进喷流与流出物质的相互作用。我们讨论我们的研究结果的背景下,脊柱鞘的情况下,环揭示鞘及其与周围环境(窄线区域,NLR,云)的相互作用。我们发现射电辐射与$γ$射线辐射相关,射电辐射滞后于$γ$射线。基于$γ$射线变化时间尺度,我们将$γ$射线发射区限制在BLR(30-200 $r_{\rm g}$)和喷流发射区内.我们讨论了外流BLR通过外康普顿散射提供了产生$γ$射线的外辐射场。中微子最有可能是在耀变体区(在BLR之外)的质子-质子相互作用中产生的,这是由喷流与致密云(即NLR中的一些分子云)的偶然相遇所实现的。

英文摘要:

On 2019/07/30.86853 UT, IceCube detected a high-energy astrophysical neutrino candidate. The Flat Spectrum Radio Quasar PKS 1502+106 is located within the 50 percent uncertainty region of the event. Our analysis of 15 GHz Very Long Baseline Array (VLBA) and astrometric 8 GHz VLBA data, in a time span prior and after the IceCube event, reveals evidence for a radio ring structure which develops with time. Several arc-structures evolve perpendicular to the jet ridge line. We find evidence for precession of a curved jet based on kinematic modelling and a periodicity analysis. An outflowing broad line region (BLR) based on the C IV line emission (Sloan Digital Sky Survey, SDSS) is found. We attribute the atypical ring to an interaction of the precessing jet with the outflowing material. We discuss our findings in the context of a spine-sheath scenario where the ring reveals the sheath and its interaction with the surroundings (narrow line region, NLR, clouds). We find that the radio emission is correlated with the $γ$-ray emission, with radio lagging the $γ$-rays. Based on the $γ$-ray variability timescale, we constrain the $γ$-ray emission zone to the BLR (30-200 $r_{\rm g}$) and within the jet launching region. We discuss that the outflowing BLR provides the external radiation field for $γ$-ray production via external Compton scattering. The neutrino is most likely produced by proton-proton interaction in the blazar zone (beyond the BLR), enabled by episodic encounters of the jet with dense clouds, i.e. some molecular cloud in the NLR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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