arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2602.11280astro-ph.GA
收藏

首次基于MUSE观测的星系尺度出流性质的统计约束:通过其扩展的Mg II发射线

First statistical constraints on galactic scale outflows properties traced by their extended Mg II emission with MUSE

Leibniz-Institut for Astrophysik Potsdam (AIP)(波茨坦莱布尼茨天体物理研究所);Univ of Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon (CRAL) UMR5574(里昂第一大学、巴黎高等师范学院、法国国家科学研究中心、里昂天体物理研究中心);NSF’s National Optical-Infrared Astronomy Research Laboratory(美国国家光学-红外天文研究实验室);Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo(东京大学大学院人文社会系研究科综合文化学研究科)

Ismael Pessa, Lutz Wisotzki, Tanya Urrutia, Nicolas F. Bouché, Floriane Leclercq, Ramona Augustin, Yucheng Guo, Daria Kozlova, Haruka Kusakabe, John Pharo

AI总结:

利用MUSE观测47个星系的深积分场数据,首次统计研究Mg II发射线所揭示的星系尺度出流性质,发现出流与恒星形成率、恒星形成率密度及年轻恒星人口相关,且出流速度与星系质量相关。

摘要:

星系在巨大的气体晕中演化,这些气体晕为恒星形成提供燃料并携带反馈驱动的出流的特征。深积分场数据使研究Mg II晕成为可能,这些晕通过发射线追踪星系尺度的出流,但它们的微弱性限制了研究只能针对单个对象。本文基于MUSE观测的47个星系(0.7<z<2.0)的深入数据,首次对Mg II发射线晕进行了统计研究。在先前工作中,我们开发并应用了一个用于单个Mg II晕的出流建模框架,现在将该方法扩展到更大样本,从而获得关于环状星系出流性质的稳健群体层面见解。我们检测到延伸到数十千秒的发射线,并将出流建模为一个径向加速壳层的集合。具有Mg II出流的星系倾向于具有更高的SFRs、sSFRs和更年轻的恒星人口,这与恒星形成驱动的风一致。观测结果与加速线性随半径增加的风一致,从发射速度约60 km/s到最大速度,这些速度与恒星质量相关,达到约490 km/s。它们的内区高度不透明,我们发现恒星质量与中心光学深度之间存在潜在趋势。出流的开放角在宿主星系恒星质量上表现出一些依赖性,低质量星系主要表现为宽开放角,而高质量星系则表现出更广的范围,包括宽和窄开放角。Mg II晕的空间范围分布在半光度半径(HLR)约5 kpc处有明显峰值,延伸到更大的HLR值,最高达约20 kpc。紧凑的晕尺寸(HLR < 8 kpc)与恒星质量相关,但扩展的晕不相关,这可能表明紧凑和扩展晕的驱动机制存在差异。

英文摘要:

Galaxies evolve within vast gaseous halos that fuel star formation and carry signatures of feedback-driven outflows. Deep integral field data have enabled the study of MgII halos, which trace galaxy-scale outflows in emission, but their faintness has limited studies to single-object analyses. Here, we present the first statistical study of MgII-emitting halos using deep MUSE observations of 47 star-forming galaxies at $0.7<z<2.0$. Building on our previous work, where we developed and applied an outflow modeling framework for a single MgII halo, we now extend this approach to a larger sample, enabling robust population-level insights on the properties of circumgalactic outflows traced by their extended MgII emission. We detect extended emission out to tens of kiloparsecs and model the outflows as an ensemble of radially accelerating shells. Galaxies with MgII outflows tend to have higher SFRs, sSFRs, and younger stellar populations, consistent with star-formation-driven winds. The observations are consistent with winds that accelerate linearly with radius, from launching velocities of ~60 km/s up to maximum velocities that correlate with stellar mass and reach ~490 km/s. Their inner regions are highly opaque, and we find a tentative trend between stellar mass and central optical depth. The opening angle of the outflow shows some dependency on the host-galaxy stellar mass, with less massive galaxies showing primarily wide opening angles, and more massive galaxies showing a broader range of values, with both wide and narrow opening angles. The distribution of the spatial extent of MgII halos exhibits a clear peak at half-light radius (HLR) of ~5 kpc, with an extended tail of larger HLR values, up to ~20 kpc. Compact halo sizes (HLR $< 8$ kpc) correlate with stellar mass, but extended halos do not, which could suggest a difference in the powering mechanism between compact and extended halos.

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。

↑