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arXiv 2406.17847astro-ph.HEastro-ph.GA
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质量很重要:我们是否正在通过 JWST 目睹高红移黑洞中的超爱丁顿吸积?

Size matters: are we witnessing super-Eddington accretion in high-redshift black holes from JWST?

Alessandro Lupi, Alessandro Trinca, Marta Volonteri, Massimo Dotti, Chiara Mazzucchelli

AI总结:

本文通过分析近/超爱丁顿吸积 MBH 的连续谱与宽线变化,指出 JWST 高红移 MBH 质量估计不确定性可达一个数量级,低质量、高吸积率解释可使其回归局域关系并提示广泛超爱丁顿阶段。

摘要:

James Webb Space Telescope(JWST,詹姆斯·韦布空间望远镜)对 z≳4 宇宙的观测表明,与活动星系核的局域相关关系相比,大质量黑洞(MBH)显得极端超重。在某些情况下,这些天体甚至可能达到所推断星系恒星质量的一半。因此,理解这类天体如何形成并增长到这样的质量,已成为理论模型面临的一大挑战;相关想法从重种子到超爱丁顿吸积阶段不等。在这里,我们采用一种不同的方法,试图推断这些 MBH 质量估计的准确程度,以及我们是否真的需要修改物理模型。通过考虑一个正在吸积的 MBH 在接近和超过爱丁顿极限时,其出射光谱(包括连续谱和宽线)如何变化,我们推断,与局域对应体相比,MBH 质量估计存在大得多的不确定性,最高可达一个数量级,并且可能倾向于更低的质量和更高的吸积率;这 i)使它们更接近局域相关关系,ii)可能表明我们正在首次目睹一个广泛存在的极快速吸积阶段。

英文摘要:

Observations by the James Webb Space Telescope of the Universe at $z\gtrsim 4$ have shown that massive black holes (MBHs) appear extremely overmassive compared to the local correlation for active galactic nuclei. In some cases, these objects might even reach half the stellar mass inferred for the galaxy. Understanding how such objects formed and grew to this masses has then become a big challenge for theoretical models, with different ideas ranging from heavy seed to super-Eddington accretion phases. Here, we take a different approach, and try to infer how accurate these MBH mass estimates are and whether we really need to revise our physical models. By considering how the emerging spectrum (both the continuum and the broad lines) of an accreting MBH changes close to and above the Eddington limit, we infer a much larger uncertainty in the MBH mass estimates relative to that of local counterparts, up to an order of magnitude, and a potential preference for lower masses and higher accretion rates, which i) move them closer to the local correlations, and ii) might indicate that we are witnessing for the first time a widespread phase of very rapid accretion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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