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

IF 4.7 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC ACS Applied Electronic Materials Pub Date : 2024-02-16 DOI:10.3390/galaxies12010008

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

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Abstract

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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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

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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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567

期刊介绍： ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/Abstracted： Web of Science SCIE Scopus CAS INSPEC Portico