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arXiv 2301.07355astro-ph.GAastro-ph.HE
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J2102 +6015:早期宇宙中一个有趣的射电大声活动星系核

J2102+6015: an Intriguing Radio-loud Active Galactic Nucleus in the Early Universe

S. Frey, T. An, K. Gabányi, L. Gurvits, M. Krezinger, A. Melnikov, P. Mohan, Z. Paragi, K. Perger, F. Shu, O. Titov, P. de Vicente, Y. Zhang

摘要:

强高红移类星体J2102+6015(z=4.575)可能为研究早期宇宙中的超大质量黑洞生长、星系演化和反馈提供有用的信息。到目前为止,该源仅在2/8 GHz(S/X)波段用甚长基线干涉仪(VLBI)成像,显示出复杂的紧凑结构。它的总无线电频谱在其余帧中的峰值约为6 GHz。没有多普勒增强喷流发射的迹象,其东西向结构中两个主要特征的分离跨度约为10毫弧秒,在十年以上的时间尺度上不会发生显着变化。然而,VLBI天体测量监测观测表明其绝对位置的准周期(~3年)变化。J2102+6015可能是一个年轻的射电源,喷流与视线不一致。在这里,我们简要报告了我们的新的高分辨率成像观测与欧洲VLBI网络(EVN)在5和22 GHz的频率在2021年6月,并给出了一个概述,目前已知的这个特殊的遥远的喷射活动星系核。

英文摘要:

The powerful high-redshift quasar J2102+6015 (at z=4.575) may provide useful information for studying supermassive black hole growth, galaxy evolution and feedback in the early Universe. The source has so far been imaged with very long baseline interferometry (VLBI) at 2/8 GHz (S/X) bands only, showing complex compact structure. Its total radio spectrum peaks at ~6 GHz in the rest frame. There is no sign of Doppler-boosted jet emission, and the separation of the two major features in its east-west oriented structure spanning ~10 milliarcsec does not change significantly on a timescale longer than a decade. However, VLBI astrometric monitoring observations suggest quasi-periodic (~3 yr) variation in its absolute position. J2102+6015 is presumably a young radio source with jets misaligned with respect to the line of sight. Here we briefly report on our new high-resolution imaging observations made with the European VLBI Network (EVN) at 5 and 22 GHz frequencies in 2021 June, and give an overview of what is currently known about this peculiar distant jetted active galactic nucleus.

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