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arXiv 2103.01960astro-ph.GA
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MUSE分析星系周围的气体(MAGG)--III:z = 3 - 4.5类星体的气体和星系环境

MUSE Analysis of Gas around Galaxies (MAGG) -- III: The gas and galaxy environment of z = 3-4.5 quasars

Matteo Fossati, Michele Fumagalli, Emma K. Lofthouse, Rajeshwari Dutta, Sebastiano Cantalupo, Fabrizio Arrigoni Battaia, Johan P. U. Fynbo, Elisabeta Lusso, Mic… 展开作者

Matteo Fossati, Michele Fumagalli, Emma K. Lofthouse, Rajeshwari Dutta, Sebastiano Cantalupo, Fabrizio Arrigoni Battaia, Johan P. U. Fynbo, Elisabeta Lusso, Michael T. Murphy, J. Xavier Prochaska, Tom Theuns, Ryan J. Cooke

摘要:

本文对MUSE星系团周围气体分析(MAGG)巡天中的27个z = 3 - 4.5亮类星体的环境进行了研究。通过中等深度的MUSE观测(每个场4小时的目标),我们通过同时研究类星体宿主晕中扩展气体星云和Lyalpha发射体(LAEs)的性质来研究类星体对其周围环境的影响。我们检测到扩展(高达~100千秒差距)Lyalpha发射周围的所有MAGG类星体,发现一个非常弱的红移z = 3和z = 6之间的演变。通过叠加MUSE数据管,我们确信地检测到CIV的扩展发射,并且仅略微检测到扩展HeII高达~40 kpc,这意味着气体是金属富集的。此外,我们的观测结果显示,在距离根据星云发射估计的类星体系统红移300公里/秒以内,LAE的密度显着过高。这些LAEs的光度函数和等效宽度分布显示出与远离类星体的LAEs相似的形状,这表明大多数这些源的Lyalpha发射并没有被类星体辐射或与类星体环境相关的其他过程显着增强。在这个框架内,观测到的LAE超密度和我们的运动学测量意味着z = 3 - 4.5的明亮类星体由质量范围为~10 ^{12.0}-10 ^<$12.5} Msun的晕托管。

英文摘要:

We present a study of the environment of 27 z=3-4.5 bright quasars from the MUSE Analysis of Gas around Galaxies (MAGG) survey. With medium-depth MUSE observations (4 hours on target per field), we characterise the effects of quasars on their surroundings by studying simultaneously the properties of extended gas nebulae and Lyalpha emitters (LAEs) in the quasar host haloes. We detect extended (up to ~ 100 kpc) Lyalpha emission around all MAGG quasars, finding a very weak redshift evolution between z=3 and z=6. By stacking the MUSE datacubes, we confidently detect extended emission of CIV and only marginally detect extended HeII up to ~40 kpc, implying that the gas is metal enriched. Moreover, our observations show a significant overdensity of LAEs within 300 km/s from the quasar systemic redshifts estimated from the nebular emission. The luminosity functions and equivalent width distributions of these LAEs show similar shapes with respect to LAEs away from quasars suggesting that the Lyalpha emission of the majority of these sources is not significantly boosted by the quasar radiation or other processes related to the quasar environment. Within this framework, the observed LAE overdensities and our kinematic measurements imply that bright quasars at z=3-4.5 are hosted by haloes in the mass range ~ 10^{12.0}-10^{12.5} Msun.

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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