标题： 视线方向上重叠的两个相互作用星系中的分子气体 显示英文标题

标题： Molecular gas in a system of two interacting galaxies overlapping on the line-of-sight

摘要： 星系相互作用可以扰动星系盘中的气体，压缩它，激发它，并增强恒星形成。 一个可能由两个在视线方向上重叠的相互作用星系组成的有趣系统之前通过来自阿帕契峡谷天文台（APO）的近邻星系积分场光谱仪（MaNGA）的电离气体观测进行了研究。 使用MaNGA光谱对两个组分进行分解，并结合多波长研究，使得该系统被表征为一次次要并合，伴有相互作用引发的恒星形成，可能还有活动星系核（AGN）活动。 我们利用来自北扩展毫米波阵列（NOEMA）的新干涉观测数据，对这个系统的CO(1-0)气体进行观测，以对比和结合空间分辨的电离气体和分子气体观测数据。 模拟系统生成的NOEMA和MaNGA数据与观测数据进行比较。 NOEMA对分子气体的观测显示其动力学温度比电离气体更低，有助于精确确定系统的配置，我们将该系统重新审视为一次主要并合。 结合电离气体和分子气体数据，使我们能够研究该系统的恒星形成效率。 显示英文摘要

摘要： Galaxy interactions can disturb gas in galactic discs, compress it, excite it, and enhance star formation. An intriguing system likely consisting of two interacting galaxies overlapping on the line-of-sight was previously studied through ionised gas observations from the integral-field spectrograph Mapping Nearby Galaxies at APO (MaNGA). A decomposition into two components using MaNGA spectra, together with a multi-wavelength study, allowed to characterise the system as a minor-merger with interaction-induced star-formation, and maybe AGN activity. We use new interferometric observations of the CO(1-0) gas of this system from the NOrthern Extended Millimeter Array (NOEMA) to confront and combine the spatially-resolved ionised and molecular gas observations. Mock NOEMA and MaNGA data are computed from simulated systems of two discs and compared to the observations. The NOEMA observations of the molecular gas, dynamically colder than the ionised gas, help to precise the configuration of the system, which we revisit as being a major merger. Combination of ionised and molecular gas data allow us to study the star-formation efficiency of the system.