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arXiv 1602.06310astro-ph.GA
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模拟赖氨酸$α$团簇和赖氨酸$α$发射体的演化

Modelling the Evolution of Ly$α$ Blobs and Ly$α$ Emitters

Marijana Smailagić, Miroslav Micic, Nemanja Martinovic

摘要:

在这项工作中,我们观察到的演化莱曼α斑点(LABs)作为红移的函数的共动数密度的模型,并试图找到其中的发射机制是占主导地位的LAB。我们的模型计算LAB发射冷却辐射星系际气体吸积到星系和恒星形成(SF)。我们使用暗物质(DM)宇宙学模拟,我们应用经验配方的冷却辐射和SF在每个晕产生的LY $α$发射。与以前的工作不同,DM模拟中的模拟体积足够大,可以产生平均LAB数密度。在一系列的红移$z\sim 1-7$,我们比较我们的结果与所观察到的亮度功能的LABs和LAEs。我们的冷却辐射光度似乎太小,无法解释所有红移的LAB光度。相比之下,SF,我们得到了很好的协议与观察到的LF在所有的红移研究。我们还讨论了可能影响所获得的结果的不确定性,以及如何LAB LF可以在具有不同密度的字段中相互关联。

英文摘要:

In this work we model the observed evolution in comoving number density of Lyman-alpha blobs (LABs) as a function of redshift, and try to find which mechanism of emission is dominant in LAB. Our model calculates LAB emission both from cooling radiation from the intergalactic gas accreting onto galaxies and from star formation (SF). We have used dark matter (DM) cosmological simulation to which we applied empirical recipes for Ly$α$ emission produced by cooling radiation and SF in every halo. In difference to the previous work, the simulated volume in the DM simulation is large enough to produce an average LABs number density. At a range of redshifts $z\sim 1-7$ we compare our results with the observed luminosity functions of LABs and LAEs. Our cooling radiation luminosities appeared to be too small to explain LAB luminosities at all redshifts. In contrast, for SF we obtained a good agreement with observed LFs at all redshifts studied. We also discuss uncertainties which could influence the obtained results, and how LAB LFs could be related to each other in fields with different density.

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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