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arXiv 2306.09142astro-ph.GA
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GN-z11:$z=$10.603处活动星系核(AGN)的环境

GN-z11: The environment of an AGN at $z=$10.603

Jan Scholtz, Callum Witten, Nicolas Laporte, Hannah Ubler, Michele Perna, Roberto Maiolino, Santiago Arribas, William Baker, Jake Bennett, Francesco D'Eugenio, … 展开作者

Jan Scholtz, Callum Witten, Nicolas Laporte, Hannah Ubler, Michele Perna, Roberto Maiolino, Santiago Arribas, William Baker, Jake Bennett, Francesco D'Eugenio, Sandro Tacchella, Joris Witstok, Andrew Bunker, Stefano Carniani, Stephane Charlot, Giovanni Cresci, Emma Curtis-Lake, Daniel Eisenstein, Nimisha Kumari, Brant Robertson, Bruno Rodriguez Del Pino, Charlotte Simmonds, Renske Smit, Giacomo Venturi, Christina Williams, Christopher Willmer

AI总结:

利用JWST/NIRSpec IFU观测发现GN-z11的Ly$α$发射属于延伸晕,并识别出三个发射线候选体,首次揭示了该AGN处于大爆炸后4亿年形成的候选原星系团核心中。

摘要:

近期使用詹姆斯·韦伯空间望远镜(JWST)的观测进一步精确了GN-z11的光谱红移,GN-z11是哈勃空间望远镜(HST)在$z=10.603$处识别出的最遥远星系之一。极高密度气体($>10^{10}$ cm$^{-3}$)的存在、高电离发射线的探测、CII*1335发射的发现,以及电离锥的存在,表明GN-z11也宿主着一个活动星系核(AGN)。进一步的光度和光谱后续观测表明,它位于一个大规模过密结构中,其晕中可能存在第三星族(PopIII)恒星的迹象。令人惊讶的是,尽管在这样的红移下预期星系际介质大部分是中性的,但依然探测到了Ly$α$发射。我们利用近期的JWST/NIRSpec IFU观测证明,GN-z11的Ly$α$发射是延伸晕的一部分,根据用于推导晕大小的定义,该晕的最小尺寸为0.8--3.2 kpc。GN-z11周围Ly$α$晕的表面亮度与在$z\sim6$类星体周围观测到的Ly$α$晕一致。在$z\sim$10.6时Ly$α$的波长处,我们在IFU视场内识别出另外三个发射线候选体,在JWST/NIRCam的深场图像中没有可见的紫外静止系对应体。如果得到证实,这可能是首个证据,表明GN-z11的局部区域代表了一个候选原星系团核心,形成于大爆炸后仅400 Myr。我们给出了该结构暗物质晕质量的首次估计($M_h$=2.96$^{+0.44}_{-0.39} \times$10$^{10}$ M$_{\odot}$),这与类似后发座星系团的前身星系团一致。

英文摘要:

Recent observations with the \textit{James Webb} Space Telescope (JWST) have further refined the spectroscopic redshift of GN-z11, one of the most distant galaxies identified with the \textit{Hubble} Space Telescope (HST) at $z=10.603$. The presence of extremely dense gas ($>10^{10}$ cm$^{-3}$), the detection of high-ionisation lines and of CII*1335 emission, as well as the presence of an ionisation cone, indicate that GN-z11 also hosts an Active Galactic Nucleus (AGN). Further photometric and spectroscopic follow-up demonstrates that it lies in a large-scale, overdense structure with possible signatures of Population III (PopIII) stars in its halo. Surprisingly, Ly$α$ has also been detected despite the expected largely neutral inter-galactic medium at such a redshift. We exploit recent JWST/NIRSpec IFU observations to demonstrate that the Ly$α$ emission in GN-z11 is part of an extended halo with a minimum size of 0.8--3.2 kpc, depending on the definition used to derive the halo size. The surface brightness of the Ly$α$ halo around GN-z11 appears consistent with Ly$α$ halos observed around $z\sim6$ quasars. At the wavelength of Ly$α$ at $z\sim$10.6, we identify three other emission line candidates within the IFU Field-of-View with no UV rest-frame counterpart visible in deep images from the JWST/NIRCam. If confirmed, this could be the first evidence that the local region of GN-z11 represents a candidate protocluster core, forming just 400 Myr after the Big Bang. We give a first estimate of the dark matter halo mass of this structure ($M_h$=2.96$^{+0.44}_{-0.39} \times$10$^{10}$ M$_{\odot}$), consistent with a Coma-like cluster progenitor.

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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