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arXiv 2305.04593astro-ph.GA
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使用MUSE观测的56个MATLAS矮星系的径向速度与恒星族群性质

Radial velocities and stellar population properties of 56 MATLAS dwarf galaxies observed with MUSE

Nick Heesters, Oliver Müller, Francine R. Marleau, Pierre-Alain Duc, Rubén Sánchez-Janssen, Mélina Poulain, Rebecca Habas, Sungsoon Lim, Patrick R. Durrell

AI总结:

本研究利用MUSE光谱观测了MATLAS调查中56个低至中等密度环境的矮星系,通过pPXF全谱拟合测定了它们的径向速度、恒星族群性质,发现其相对恒星质量-金属丰度关系存在向低金属丰度的系统性偏移。

摘要:

矮星系已在本星系群、近邻星系群及特定星系团中被广泛研究,为我们提供了它们在宇宙特定位置的全局恒星与动力学性质的可靠图景。对这些性质的深入研究揭示了它们之间的相关性,包括著名的普适恒星质量-金属丰度关系。然而,由于矮星系存在于极其多样的环境中,通过将这些天体的研究扩展到不同位置,可以更多地了解星系的形成与演化。我们展示了56个矮星系样本的MUSE光谱观测结果,作为MATLAS调查在本体积之外低至中等密度环境中的后续研究。这些矮星系的恒星质量范围为$M_{*}/M_{\odot}$ = 10$^{6.1}$-10$^{9.4}$,距离范围D = 14-148 Mpc,其中大多数(75%)位于MATLAS调查的目标范围内(10-45 Mpc)。因此,我们报告在此展示的子样本中,MATLAS调查对矮星系半自动识别的成功率为75%(矮椭圆星系为79%)。使用pPXF全谱拟合,我们测定了它们的视线方向速度,并能够将大多数矮星系与其大质量宿主星系进行匹配。对光谱的仔细检查显示,约30%表现出明显的发射线,从而表明存在恒星形成活动。我们估算了它们的恒星族群性质(年龄和金属丰度),并将我们的结果与其他研究本体积和星系团矮星系的工作进行了比较。我们发现,本研究中提出的矮星系在相同恒星质量下,相对于恒星质量-金属丰度关系表现出向更低金属丰度的系统性偏移。在本文探测的恒星质量范围内,其他研究中也存在类似的偏差,这可能归因于推导金属丰度时使用了不同的方法。

英文摘要:

Dwarf galaxies have been extensively studied in the Local Group, in nearby groups, and selected clusters, giving us a robust picture of their global stellar and dynamical properties in particular locations in the Universe. Intense study of these properties has revealed correlations between them, including the well known universal stellar mass-metallicity relation. However, since dwarfs play a role in a vast range of different environments, much can be learned about galaxy formation and evolution through extending the study of these objects to various locations. We present MUSE spectroscopy of a sample of 56 dwarf galaxies as a follow-up to the MATLAS survey in low-to-moderate density environments beyond the Local Volume. The dwarfs have stellar masses in the range of $M_{*}/M_{\odot}$ = 10$^{6.1}$-10$^{9.4}$ and show a distance range of D = 14-148 Mpc, the majority (75%) of which are located in the range targeted by the MATLAS survey (10-45 Mpc). We thus report a 75% (79% for dwarf ellipticals) success rate for the semi-automatic identification of dwarf galaxies in the MATLAS survey on the here presented subsample. Using pPXF full spectrum fitting, we determine their line-of-sight velocity and can match the majority of them with their massive host galaxy. Close inspection of their spectra reveals that ~30% show clear emission lines and thus star formation activity. We estimate their stellar population properties (age and metallicity) and compare our results with other works investigating Local Volume and cluster dwarf galaxies. We find that the dwarf galaxies presented in this work show a systematic offset from the stellar mass-metallicity relation towards lower metallicities at the same stellar mass. A similar deviation is present in other works in the stellar mass range probed in this work and might be attributed to the use of different methodologies for deriving the metallicity.

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