arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.01162astro-ph.GAastro-ph.CO
收藏

莱曼α团块1的ALMA观测:多个主要合并和广泛分布的星际介质

ALMA Observations of Lyman-alpha Blob 1: Multiple major-mergers and widely distributed interstellar media

Hideki Umehata, Ian Smail, Charles C. Steidel, Matthew Hayes, Douglas Scott, A. M. Swinbank, R. J. Ivison, Toru Nagao, Mariko Kubo, Kouichiro Nakanishi, Yuichi … 展开作者

Hideki Umehata, Ian Smail, Charles C. Steidel, Matthew Hayes, Douglas Scott, A. M. Swinbank, R. J. Ivison, Toru Nagao, Mariko Kubo, Kouichiro Nakanishi, Yuichi Matsuda, Soh Ikarashi, Yoichi Tamura, J. E. Geach

摘要:

我们提出了一个巨大的莱曼α斑点在SSA 22原星系团在z=3.1,SSA 22-LAB 1,采取了阿塔卡马大型毫米/亚毫米阵列(ALMA)的意见。在LAB 1中探测到尘埃连续体、[C II] 158 um和CO(4-3)谱线发射,显示出跨越~100 kpc中心区域的复杂形态学和运动学。在[C II]和尘埃连续辐射中识别出周围z=3.0987-3.1016的七个星系,其中两个可能是与最大质量星系相关的伴星或潮汐结构。广泛分布介质的空间分辨[C II]和红外光度比(L[C II]/LIR~0.01-0.001)表明,观测到的扩展星际介质很可能起源于恒星形成活动,冲击气体的贡献可能不占主导地位。发现LAB 1含有总分子气体质量Mmol=(8.7+/-2.0)e+10 Msun,集中在Ly-alpha发射区的核心区域。虽然LAB 1核心中的恒星形成活动(主要是被遮蔽的)是Ly-alpha发射最合理的动力源之一,但核心中发现的多个主要合并也可能在使LAB 1异常明亮和延长Ly-alpha中发挥作用,这是引力相互作用引起的冷却辐射的结果。

英文摘要:

We present observations of a giant Lyman-alpha blob in the SSA22 proto-cluster at z=3.1, SSA22-LAB1, taken with the Atacama Large Millimeter/submillimeter Array (ALMA). Dust continuum, along with [C II]158um, and CO(4-3) line emission have been detected in LAB1, showing complex morphology and kinematics across a ~100 kpc central region. Seven galaxies at z=3.0987-3.1016 in the surroundings are identified in [C II] and dust continuum emission, with two of them potential companions or tidal structures associated with the most massive galaxies. Spatially resolved [C II] and infrared luminosity ratios for the widely distributed media (L[C II]/LIR~0.01-0.001) suggest that the observed extended interstellar media are likely to have originated from star-formation activity and the contribution from shocked gas is probably not dominant. LAB1 is found to harbour a total molecular gas mass Mmol=(8.7+/-2.0)e+10 Msun, concentrated in the core region of the Ly-alpha-emitting area. While (primarily obscured) star-formation activity in the LAB1 core is one of the most plausible power sources for the Ly-alpha emission, multiple major-mergers found in the core may also play a role in making LAB1 exceptionally bright and extended in Ly-alpha as a result of cooling radiation induced by gravitational interactions.

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。

↑