发射伽马射线的窄线塞弗特1星系TXS 1206+549的超光速运动和射流参数

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS

Galaxies Pub Date : 2024-02-16 DOI:10.3390/galaxies12010008

Bettina Koz'ak, Sándor Frey, Krisztina 'Eva Gab'anyi

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引用次数: 0

摘要

窄线塞弗特1（NLS1）星系是活动星系核（AGN）的一个奇特亚类。其中，TXS 1206+549 属于一小群射电噪声大且发射γ射线的 NLS1 星系。我们通过分析 1994 年至 2018 年期间以 8 GHz 频率在六个时间点进行的档案式高分辨率甚长基线干涉测量（VLBI）成像观测数据，重点研究了这个星系的射电特性。利用毫微秒尺度的射电结构，我们可以分辨出一个核心和一个喷流成分，它们的角间隔增加了（0.055±0.006）mas yr-1。这相当于喷流分量的表面超光速运动为 (3.5±0.4)c。根据核心亮度温度和喷流分量的正常运动，我们确定了特征多普勒增强因子、体洛伦兹因子和喷流视角。我们没有发现令人信服的证据表明存在非常紧密排列的类星体喷流。TXS 1206+549的参数类似于射电云量类星体喷流的参数，洛伦兹系数适中（Γ≈4），与视线的倾角为ϑ≈24∘。

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Superluminal Motion and Jet Parameters in the Gamma-ray-Emitting Narrow-Line Seyfert 1 Galaxy TXS 1206+549

Narrow-line Seyfert 1 (NLS1) galaxies are a peculiar subclass of active galactic nuclei (AGN). Among them, TXS 1206+549 belongs to a small group of radio-loud and γ-ray-emitting NLS1 galaxies. We focus on the radio properties of this galaxy by analysing archival, high-resolution, very long baseline interferometry (VLBI) imaging observations taken at 8 GHz frequency in six epochs between 1994 and 2018. Using the milliarcsecond-scale radio structure, we can resolve a core and a jet component whose angular separation increases by (0.055±0.006) mas yr−1. This corresponds to an apparent superluminal jet component motion of (3.5±0.4)c. From the core brightness temperature and the jet component proper motion, we determine the characteristic Doppler-boosting factor, the bulk Lorentz factor, and the jet viewing angle. We find no compelling evidence for a very closely aligned blazar-type jet. The parameters for TXS 1206+549 resemble those of radio-loud quasar jets with a moderate Lorentz factor (Γ≈4) and ϑ≈24∘ inclination to the line of sight.

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来源期刊

Galaxies Physics and Astronomy-Astronomy and Astrophysics

CiteScore

4.90

自引率

12.00%

发文量

100

审稿时长

11 weeks

期刊介绍： Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.