论文标题
Alma在强大的射电星系TXS 0828+193中检测到分子气
ALMA detects molecular gas in the halo of the powerful radio galaxy TXS 0828+193
论文作者
论文摘要
理论和观察结果都表明，高红移射电星系（HZRGS）居住在宇宙的过度密度区域，可能是位于星系簇中心的局部大型星系的祖细胞。在本文中，我们使用Atacama大毫米/毫米阵列提出了HZRG TXS 0828+193（Z = 2.57）的CO（3-2）线观测值及其环境。与以前的观察相反，我们检测到与HZRG相关的CO发射，并得出$（0.9 \ pm0.3）\ times10^{10} \，\ rm m _ {\ odot} $的分子气体质量。此外，我们确认存在先前检测到的外源co发射区域（伴侣＃1），并检测到三个新的潜在伴侣。每个伴侣的分子气体质量与HZRG的分子气体相当。伴侣＃1与无线电射流的轴对齐，并具有Spitzer检测到的恒星发射。因此，该源可能是正常的星形星系，也可能是喷射诱导的恒星形成的结果。新发现的CO来源在任何其他观察带中都没有对应物，并且可能是TXS 0828+193的光环中的高密度云，因此有可能与宇宙网络的大规模丝状结构相关。
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.
