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arXiv 1902.10682astro-ph.GA
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高红移核星爆盘的恒星遗迹:核星团的潜在起源?

The stellar remnants of high redshift nuclear starburst discs: a potential origin for nuclear star clusters?

R. Gohil, D. R. Ballantyne, G. Li

摘要:

核星爆盘(NSD)是位于星系中心的非常致密的恒星形成区域,被认为是中央活动星系核周围吸收气体的可能来源。当超大质量黑洞(SMBH)上的模糊吸积很常见时,NSD可能在$z\sim 1$最相关。本文描述了在$z=0.01$的NSD的恒星残留物的特征,考虑到从$z=1$的演变。使用恒星合成模型,颜色,质量和恒星残骸的光度计算的一套192个二维NSD模型。这些属性进行比较,当地的核星团(NSC)的观测,并发现一个很好的匹配之间的预测和观察到的属性。动力学效应可能会导致最后的残留物是一个旋转的,接近球形的分布。此外,NSD残留物中有$\approx 20$ %的半光半径<~ 10 pc,与晚型和早型星系中的NSC一致,并且所有残留物都遵循与附近NSC相似的大小-光度关系。NSD需要一个中央SMBH的存在,最大质量和最紧凑的恒星残骸与最大质量的SMBH相关联,尽管所有考虑的SMBH质量都可以产生各种大小的星团。总体而言,NSD在$z\sim 1$似乎是一个有前途的起源$\gg 1$陀螺NSC人口的早期和晚期型星系与大型SMBH。

英文摘要:

Nuclear starburst discs (NSDs) are very compact star-forming regions in the centers of galaxies that have been studied as a possible origin for the absorbing gas around a central active galactic nucleus. NSDs may be most relevant at $z\sim 1$ when obscured accretion onto supermassive black holes (SMBHs) is common. This paper describes the characteristics of the stellar remnants of NSDs at $z=0.01$, taking into account the evolution from $z=1$. Using a stellar synthesis model, the colours, masses, and luminosities of the stellar remnants are computed for a suite of 192 two-dimensional NSD models. These properties are compared to observations of local nuclear star clusters (NSCs), and a good match is found between the predicted and observed properties. Dynamical effects will likely cause the final remnant to be a rotating, nearly spherical distribution. In addition, $\approx 20$% of the NSD remnants have half-light radii <~ 10 pc, consistent with NSCs hosted in both late-type and early-type galaxies, and all the remnants follow similar size-luminosity relationships as observed in nearby NSCs. NSDs require the presence of a central SMBH and the most massive and compact stellar remnants are associated with the most massive SMBHs, although stellar clusters with a variety of sizes can be produced by all considered SMBH masses. Overall, NSDs at $z\sim 1$ appear to be a promising origin for the $\gg 1$ Gyr NSC population in early- and late-type galaxies with large SMBHs.

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