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arXiv 2012.12923astro-ph.GAastro-ph.CO
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ALMA探测到强大射电星系TXS 0828+193晕中的分子气体

ALMA detects molecular gas in the halo of the powerful radio galaxy TXS 0828+193

Judit Fogasy, Kirsten K. Knudsen, Guillaume Drouart, Bitten Gullberg

摘要:

理论和观测结果都表明,高红移射电星系(HzRGs)居住在宇宙的过密区域,可能是居住在星系团中心的本地大质量星系的祖先。本文介绍了利用阿塔卡玛大型毫米/亚毫米波天线阵对HzRG TXS 0828+193(z=2.57)及其周围环境的CO(3-2)谱线观测。与以前的观测结果相比,我们检测到CO排放与HzRG和推导出分子气体质量的$(0.9\pm0.3)\times10^{10}\,\rm M_{\odot}$。此外,我们确认了先前检测到的离源CO发射区(同伴#1)的存在,并检测到三个新的潜在同伴。每个伴星的分子气体质量都与HzRG相当。伴星#1与射电喷流的轴线对齐,并有斯皮策探测到的恒星辐射。因此,这个来源可能是一个正常的恒星形成星系,或者是喷流诱导恒星形成的结果。新发现的CO源在任何其他观测波段都没有对应的来源,可能是TXS 0828+193晕中的高密度云,因此可能与宇宙网的大尺度结构有关。

英文摘要:

Both theoretical and observational results suggest that high-redshift radio galaxies (HzRGs) inhabit overdense regions of the universe and might be the progenitors of local, massive galaxies residing in the centre of galaxy clusters. In this paper we present CO(3-2) line observations of the HzRG TXS 0828+193 (z=2.57) and its environment using the Atacama Large Millimeter/submillimeter Array. In contrast to previous observations, we detect CO emission associated with the HzRG and derive a molecular gas mass of $(0.9\pm0.3)\times10^{10}\,\rm M_{\odot}$. Moreover, we confirm the presence of a previously detected off-source CO emitting region (companion #1), and detect three new potential companions. The molecular gas mass of each companion is comparable to that of the HzRG. Companion #1 is aligned with the axis of the radio jet and has stellar emission detected by Spitzer. Thus this source might be a normal star-forming galaxy or alternatively a result of jet-induced star formation. The newly found CO sources do not have counterparts in any other observing band and could be high-density clouds in the halo of TXS 0828+193 and thus potentially linked to the large-scale filamentary structure of the cosmic web.

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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