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arXiv 2101.07537astro-ph.GA
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Mrk~766中活动核附近的一对UV核或致密的恒星形成区?

A pair of UV nuclei or a compact star forming region near the active nucleus in Mrk~766?

P. P. Deka, G. C. Dewangan, K. P. Singh, J. Postma

摘要:

利用Astrosat/UVIT观测,在Mrk~766中发现了一个明亮、致密的紫外源,它与已知的活动星系核(AGN)的投影距离为1.1 kpc。我们进行径向轮廓分析,并推导出几乎没有附近的污染源的紫外线通量。在远紫外和近紫外波段,这个新的源比活动星系核暗2.5和5.6倍。这两个源在Mrk~766中表现为一对核。我们调查的基础上的紫外光通量比,X射线和光发射的新来源的性质。新的来源极不可能是Mrk~766中另一个吸积的超大质量黑洞,因为它没有X射线发射。我们发现,在四个不同的波段测量的新的源的UV/光通量密切遵循的形状的模板光谱的星暴星系。这有力地表明,新的来源是一个致密的恒星形成区。

英文摘要:

We report the discovery of a bright, compact ultraviolet source at a projected separation of 1.1~kpc from the known active galactic nucleus (AGN) in Mrk~766 based on Astrosat/UVIT observations. We perform radial profile analysis and derive the UV flux almost free from the nearby contaminating sources. The new source is about 2.5 and 5.6 times fainter than the AGN in the far and near UV bands. The two sources appear as a pair of nuclei in Mrk~766. We investigate the nature of the new source based on the UV flux ratio, X-ray and optical emission. The new source is highly unlikely to be another accreting supermassive black hole in Mrk~766 as it lacks X-ray emission. We find that the UV/Optical flux of the new source measured at four different bands closely follow the shape of the template spectrum of starburst galaxies. This strongly suggests that the new source is a compact star-forming region.

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