文章基本信息

标题：Molecular gas inflows and outflows in ultraluminous infrared galaxies at z ∼ 0.2 and one QSO at z = 6.1 ⋆
本地全文：下载
作者：R. Herrera-Camus ; E. Sturm ; J. Graciá-Carpio 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：633
页码：1-8
DOI：10.1051/0004-6361/201937109
语种：English
出版社：EDP Sciences
摘要：Aims.Our aim is to search for and characterize inflows and outflows of molecular gas in four ultraluminous infrared galaxies (ULIRGs;LIR > 1012L⊙) atz ∼ 0.2−0.3 and one distant quasi-stellar object (QSO) atz = 6.13.Methods.We usedHerschel/PACS and ALMA Band 7 observations of the hydroxyl molecule (OH) line at rest-frame wavelength 119μm, which in absorption can provide unambiguous evidence of inflows or outflows of molecular gas in nuclear regions of galaxies. Our study contributes to doubling the number of OH 119μm observations of luminous systems atz ∼ 0.2−0.3, and pushes the search for molecular outflows based on the OH 119μm transition toz ∼ 6.Results.We detect OH 119μm high-velocity absorption wings in three of the four ULIRGs. In two cases, IRAS F20036−1547 and IRAS F13352+6402, the blueshifted absorption profiles indicate the presence of powerful and fast (∼200−500 km s−1) molecular gas outflows. Consistent with an inside-out quenching scenario, these outflows are depleting the central reservoir of star-forming molecular gas at a rate similar to that of intense star formation activity. For the starburst-dominated system IRAS 10091+4704, we detect an inverted P Cygni profile that is unique among ULIRGs and indicates the presence of a fast (∼400 km s−1) inflow of molecular gas at a rate of ∼100 M⊙yr−1towards the central region. Finally, we tentatively detect (∼3σ) the OH 119μm doublet in absorption in thez = 6.13 QSO ULAS J131911+095051. The OH 119μm feature is blueshifted with a median velocity that suggests the presence of a molecular outflow, although characterized by a modest molecular mass loss rate of ∼200 M⊙yr−1. This value is comparable to the small mass outflow rates found in the stacking of the [C II] spectra of otherz ∼ 6 QSOs and suggests that ejective feedback in this phase of the evolution of ULAS J131911+095051 has subsided.
关键词：engalaxies: evolutiongalaxies: activegalaxies: high-redshiftquasars: absorption lines