The radio-loud narrow-line Seyfert 1 galaxy 1H 0323+342 in a galaxy merger
The radio-loud narrow-line Seyfert 1 galaxy 1H 0323+342 in a galaxy merger
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DOI：
10.1093/mnras/staa1525
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发表时间：
2020-05
影响因子：
4.8
通讯作者：
A. Doi;M. Kino;N. Kawakatu;K. Hada
中科院分区：
文献类型：
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作者：
A. Doi;M. Kino;N. Kawakatu;K. Hada
窄线Seyfert 1星系（NLS 1 s）中的超大质量黑洞（SMBH）位于活动星系核（AGN）质量函数的低端，并优先存在于具有伪隆起的晚型宿主星系中，这些星系被认为是由内部长期演化形成的。另一方面，无线电大声NLS 1的人口提出了相对论喷流范式的挑战，该范式指出，强大的无线电喷流只与椭圆主机中的非常高质量的SMBH相关，这些SMBH是通过星系合并建立的。我们研究了与最近的伽马射线发射，射电大声NLS 1，1H 0323+342相关的扭曲射电结构。这为基于其宿主星系过去的光学/近红外观测的合并假设提供了支持证据。异常射电形态由两种不同的结构组成：当前活动喷流的内部弯曲结构和低亮度遗迹的外部线性结构。这种共存可能表明，在星系合并过程中，黑洞合并之前，已经建立的黑洞双星具有进动的阶段。1H 0323+342和其他射电强NLS 1在星系相互作用下可能是从射电静NLS 1到具有较大SMBH的正常Seyfert星系的演化路径上的极端对象。
The supermassive black holes (SMBHs) of narrow-line Seyfert 1 galaxies (NLS1s) are at the lower end of the mass function of active galactic nuclei (AGNs) and reside preferentially in late-type host galaxies with pseudobulges, which are thought to be formed by internal secular evolution. On the other hand, the population of radio-loud NLS1s presents a challenge for the relativistic jet paradigm, which states that powerful radio jets are associated exclusively with very high mass SMBHs in elliptical hosts, which are built up through galaxy mergers. We investigated distorted radio structures associated with the nearest gamma-ray-emitting, radio-loud NLS1, 1H 0323+342. This provides supporting evidence for the merger hypothesis based on past optical/near-infrared observations of its host galaxy. The anomalous radio morphology consists of two different structures: the inner curved structure of the currently active jet and an outer linear structure of low-brightness relics. Such coexistence might be indicative of the stage of an established black hole binary with precession before the black holes coalesce in the galaxy merger process. 1H 0323+342 and other radio-loud NLS1s under galaxy interactions may be extreme objects on the evolutionary path from radio-quiet NLS1s to normal Seyfert galaxies with larger SMBHs in classical bulges through mergers and merger-induced jet phases.