Detection of a ∼0.1c Radio Knot in M81* Associated with a Moderate X-Ray Flare

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Xuezheng Wang, Wu Jiang, Zhiqiang Shen, Zhen Yan, Ya-Ping Li, Ivan Martí-Vidal, Roman Gold
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引用次数: 1

Abstract

Abstract Through very long baseline interferometry observations of one of the closest low-luminosity active galactic nuclei, M81*, at multiple frequencies of 8.8, 22, and 44 GHz, a bright discrete knot with an unusual low apparent speed ∼0.1 c was detected. Combined with the contemporaneous monitoring of X-ray data at 2–10 keV, our data indicate that a moderate X-ray flare happened when the knot was launched from the core region. Three possible origins of the knot are proposed to explain our observational results. They are an episodic jet ejection, a low-speed shock wave, and a possible secondary black hole in a binary system. Future intensive multiwavelength monitoring can help to understand the discrete knot as well as the central black hole better.
探测到M81*中一颗与中等x射线耀斑相关的0.1c射电结
通过对最近的低光度活动星系核之一M81*在8.8 GHz、22 GHz和44 GHz多个频率上的超长基线干涉测量观测,发现了一个不同寻常的低视速度~ 0.1 c的明亮离散结。结合同期2-10 keV的x射线监测数据,我们的数据表明,当结从核心区发射时,发生了中等程度的x射线耀斑。提出了三种可能的结的起源来解释我们的观测结果。它们是一种偶发喷射,一种低速冲击波,可能是双星系统中的次级黑洞。未来密集的多波长监测有助于更好地了解离散结和中心黑洞。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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