赫歇尔卫星发现的一个极端明亮、多重透镜的z~3亚毫米星系的分子星际介质动力学结构
宇宙学与河外天体物理
2012-01-27 v1
摘要
我们利用Plateau de Bure干涉仪、毫米波天文学联合阵列和格林班克望远镜，报告了在强透镜效应下、由赫歇尔/SPIRE选出的亚毫米星系(SMG) HLSW-01（红移z=2.9574±0.0001）中CO 5-4、3-2和1-0发射线的探测。观测将分子气体空间解析为四个最大间距约9角秒的透镜像，并揭示了该系统的内部气体动力学。我们推导出经透镜修正的CO谱线光度：L'(CO 1-0) = (4.17±0.41)、L'(CO 3-2) = (3.96±0.20)和L'(CO 5-4) = (3.45±0.20) × 10^10 (μ_L/10.9)^-1 K km/s pc^2，对应的光度比分别为r_31 = 0.95±0.10、r_53 = 0.87±0.06和r_51 = 0.83±0.09。这表明总分子气体质量为M_gas = 3.3 × 10^10 (α_CO/0.8) (μ_L/10.9)^-1 M_sun。气体质量、气体质量分数、气体消耗时标、恒星形成效率和比恒星形成率均处于SMG的典型值范围。气体储库的速度结构表明，最亮的两个透镜像是该星系中同一尘埃遮蔽区域在动力学上解析出的投影，它们与未解析的较暗像在运动学上存在偏移。解析出的运动学特征与在主要“湿”（即富含气体）并合中观测到的复杂速度结构一致。主要并合在SMG中普遍存在，并可能以高气体消耗率驱动其剧烈的星暴活动。本研究展示了利用引力透镜效应提高有效空间分辨率和灵敏度，从而对早期宇宙星系进行精细研究的潜力。
引用
@article{arxiv.1104.4116,
title = {Dynamical Structure of the Molecular Interstellar Medium in an Extremely Bright, Multiply Lensed z~3 Submillimeter Galaxy Discovered with Herschel},
author = {Dominik A. Riechers and A. Cooray and A. Omont and R. Neri and A. I. Harris and A. J. Baker and P. Cox and D. T. Frayer and J. M. Carpenter and R. Auld and H. Aussel and A. Beelen and R. Blundell and J. Bock and D. Brisbin and D. Burgarella and P. Chanial and S. C. Chapman and D. L. Clements and A. Conley and C. D. Dowell and S. Eales and D. Farrah and A. Franceschini and R. Gavazzi and J. Glenn and M. Griffin and M. Gurwell and R. J. Ivison and S. Kim and M. Krips and A. M. J. Mortier and S. J. Oliver and M. J. Page and A. Papageorgiou and C. P. Pearson and I. Perez-Fournon and M. Pohlen and J. I. Rawlings and G. Raymond and G. Rodighiero and I. G. Roseboom and M. Rowan-Robinson and K. S. Scott and N. Seymour and A. J. Smith and M. Symeonidis and K. E. Tugwell and M. Vaccari and J. D. Vieira and L. Vigroux and L. Wang and J. Wardlow and G. Wright},
journal= {arXiv preprint arXiv:1104.4116},
year = {2012}
}
备注
7 pages, 5 figures, to appear in ApJL (accepted April 19, 2011)