Discovery of an X-Ray Photoionized Optical Nebula and a Radio Nebula Associated with the ULX NGC 4861 X-1

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Hang Gong, Ryan Urquhart, Alexandr Vinokurov, Yu Bai, Antonio Cabrera-Lavers, Sergei Fabrika, Liang Wang, Jifeng Liu
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引用次数: 0

Abstract

Abstract We have conducted long-slit spectroscopic observations and analyzed archival radio data for the ultraluminous X-ray source (ULX) NGC 4861 X-1. Our spectral line analysis unveils NGC 4861 X-1 as the fourth ULX situated within an X-ray photoionized nebula, following three previous findings made approximately two decades ago. Remarkably, we discover NGC 4861 X-1 also possesses a radio nebula emitting optically thin synchrotron radiation, which contradicts its X-ray photoionization and raises doubts about the four ULXs being a mere coincidence. Instead of gradually accumulating from different bands bit by bit, our multiband discovery is made all at once. Moreover, we tentatively perceive a faint continuum spectrum of the optical nebula. Further observations are needed to ascertain its radio structures and verify the optical continuum.
与ULX NGC 4861 X-1相关的x射线光电离光学星云和射电星云的发现
摘要我们对超亮x射线源NGC 4861 X-1进行了长缝光谱观测并分析了档案射电数据。我们的光谱线分析揭示了NGC 4861 X-1是位于x射线光电离星云内的第四个ULX,之前的三个发现是在大约20年前。值得注意的是,我们发现NGC 4861 X-1还拥有一个发射光学薄同步辐射的射电星云,这与它的x射线光电离相矛盾,并提出了四个ulx仅仅是巧合的怀疑。我们的多波段发现是一次完成的,而不是从不同的波段一点一点地逐渐积累。此外,我们还试探性地感知到光学星云的微弱连续光谱。需要进一步的观测来确定它的射电结构和验证光学连续体。
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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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