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arXiv 2211.16705astro-ph.HEastro-ph.GA
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$γ$射线窄线塞弗特1星系SDSS J211852 .96 $-$ 073227.5的射电结构

The radio structure of the $γ$-ray narrow-line Seyfert 1 galaxy SDSS J211852.96$-$073227.5

Xi Shao, Minfeng Gu, Yongjun Chen, Hui Yang, Su Yao, Weimin Yuan, Zhiqiang Shen

摘要:

$γ$射线窄线塞弗特1(NLS 1)星系是具有相对论喷流的第三类$γ$射线活动星系核。在本文中,我们提出了多波段高分辨率甚长基线阵列(VLBA)图像的$γ$射线NLS 1,SDSS J211852.96 $-$ 073227.5(J2118 $-$ 0732,$z=0.26$)。我们发现一个核心喷流无线电形态和显着的流量密度变化的无线电核心。从VLBA图像和核心变化估计的高亮度温度表明,它表现出实质性的相对论性的聚束效应。从考虑在几个波段的无线电发射,我们发现,源有一个倒置的频谱以上1 GHz,但在低频率从74 MHz到1 GHz的陡峭的频谱,这些可能会出现从目前的活动和旧的扩散/扩展发射,分别。核心喷流形态、显著的通量密度变化和光束效应使J2118 $-$ 0732类似于耀变体。考虑到其中心黑洞的低质量和正在进行的合并环境,J2118 $-$ 0732可能代表一个低质量,低功率的耀变体,并可能最终演变为耀变体。

英文摘要:

The $γ$-ray narrow-line Seyfert 1 (NLS1) galaxies can be considered to be the third class of $γ$-ray active galactic nuclei possessing relativistic jets. In this paper, we present multi-band high resolution Very Long Baseline Array (VLBA) images of the $γ$-ray NLS1, SDSS J211852.96$-$073227.5 (J2118$-$0732, $z=0.26$). We find a core-jet radio morphology and significant flux density variations in the radio core. The high brightness temperature estimated from VLBA images and core variability demonstrate that it exhibits substantial relativistic beaming effects. From considering radio emission in several bands, we find that the source has an inverted spectrum above 1 GHz but a steep spectrum at low frequencies from 74 MHz to 1 GHz; these may arise from the present activity and the old diffuse/extended emission, respectively. The core-jet morphology, significant flux density variations, and beaming effect make J2118$-$0732 resemble a blazar. Considering the low mass of its central black hole and ongoing merger environment, J2118$-$0732 may represent a low-mass, low-power counterpart of blazars, and may finally evolve to a blazar.

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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