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arXiv 2001.02234astro-ph.GAastro-ph.HE
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矮星系中AGN的中红外选择困难

Difficulties in Mid-Infrared selection of AGN in dwarf galaxies

Alessandro Lupi, Tullia Sbarrato, Stefano Carniani

摘要:

虽然大质量黑洞(MBH)已知存在于所有大质量星系中,但它们在矮星系中的普遍存在尚未得到证实,迄今为止只检测到有限数量的来源。最近,一些研究提出了红外发射作为识别矮星中MBH的替代方法,基于通常应用于类星体的类似方法。在这项研究中,通过准确地结合光学和红外数据,考虑到分辨率的影响和源重叠,我们详细研究了这种方法与目前的地面设施可能存在的局限性,发现一个相当低的($\sim$ 0.4%)部分活跃MBH在矮星是发光的中红外线,与以前的几个结果一致。我们的研究结果表明,红外选择强烈影响的几个限制,使识别MBH矮星系目前禁止,特别是因为非常差的分辨率相比,光学调查,和附近的源可能的污染,虽然我们发现一些很好的候选人值得进一步跟进。因此,光学、X射线和射电观测仍然是在矮星中寻找MBH的最安全的方法。

英文摘要:

While massive black holes (MBHs) are known to inhabit all massive galaxies, their ubiquitous presence in dwarf galaxies has not been confirmed yet, with only a limited number of sources detected so far. Recently, some studies proposed infrared emission as an alternative way to identify MBHs in dwarfs, based on a similar approach usually applied to quasars. In this study, by accurately combining optical and infrared data taking into account resolution effects and source overlapping, we investigate in detail the possible limitations of this approach with current ground-based facilities, finding a quite low ($\sim$0.4 per cent) fraction of active MBH in dwarfs that are luminous in mid-infrared, consistent with several previous results. Our results suggest that the infrared selection is strongly affected by several limitations that make the identification of MBHs in dwarf galaxies currently prohibitive, especially because of the very poor resolution compared to optical surveys, and the likely contamination by nearby sources, although we find a few good candidates worth further follow-ups. Optical, X-ray and radio observations, therefore, still represent the most secure way to search for MBH in dwarfs.

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