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arXiv 2404.04099astro-ph.GA
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巨型低表面亮度星系 Malin 1 核心的 MUSE 视图

A MUSE View of the Core of the Giant Low Surface Brightness Galaxy Malin 1

Evelyn J. Johnston, Gaspar Galaz, Matias Blaña, Philippe Amram, Samuel Boissier, Paul Eigenthaler, Benoît Epinat, Junais, Yasna Ordenes-Briceño, Thomas Puzia, Peter M. Weilbacher

AI总结:

本研究利用 VLT/MUSE 对 Malin 1 核心进行光谱分解,发现相距约 1.9 kpc 的两个致密源,并据此提出不对称恒星形成棒或坠入核心的恒星形成/气体团块两种解释。

摘要:

目的。长期以来,人们已知巨型低表面亮度星系 Malin 1 的中心区域具有复杂形态,存在核球、星系盘以及可能承载不对称恒星形成的棒状结构的证据。在本研究中,我们利用 VLT/MUSE 数据解析 Malin 1 的中心区域,以确定其结构。方法。我们对数据立方体的每个图像切片进行细致的光变轮廓拟合,建立每个形态成分随波长变化的模型,从而能够干净地提取它们的光谱。随后,我们利用这些光谱中的运动学和发射线性质,以更好地理解从模型拟合中提取的每个成分的本质。结果。我们报告在该星系中心探测到一对不同的源,二者间距约为 1.05 角秒,对应于天空上约 1.9 kpc 的间距。每个天体的径向速度数据证实,二者均位于该星系的运动学核心;对发射线的分析表明,中心致密源更符合由恒星形成和/或 LINER 电离的特征,而偏离中心的致密源则更接近恒星形成星系与 AGN 之间的分界。结论。这些证据表明,Malin 1 的中心要么承载着具有不对称恒星形成的棒状结构,要么包含两个不同成分;其中偏离中心的致密源可能是一个含有一个或多个星团的恒星形成团块,正坠入星系核心并最终将与中心 NSC 并合,也可能是从外部或星系盘坠入星系中心并在那里触发恒星形成的气体团块。

英文摘要:

Aims. The central region of the Giant Low Surface Brightness galaxy Malin 1 has long been known to have a complex morphology with evidence of a bulge, disc, and potentially a bar hosting asymmetric star formation. In this work, we use VLT/MUSE data to resolve the central region of Malin 1 in order to determine its structure. Methods. We use careful light profile fitting in every image slice of the datacube to create wavelength-dependent models of each morphological component, from which we could cleanly extract their spectra. We then used the kinematics and emission line properties from these spectra to better understand the nature of each component extracted from our model fit. Results. We report the detection of a pair of distinct sources at the centre of this galaxy with a separation of ~1.05", which corresponds to a separation on sky of ~1.9 kpc. The radial velocity data of each object confirms that they both lie in the kinematic core of the galaxy, and analysis of the emission lines reveals that the central compact source is more consistent with being ionized by star formation and/or a LINER, while the off-centre compact source lies closer to the separation between star-forming galaxies and AGN. Conclusions. This evidence suggests that the centre of Malin 1 hosts either a bar with asymmetric star formation or two distinct components in which the off-centre compact source could either be a star-forming clump containing one or more star clusters that is in the process of falling into the core of the galaxy and which will eventually merge with the central NSC, or a clump of gas infalling into the centre of the galaxy from either outside or from the disc and triggering star formation there.

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