Abstract

Using long-slit and panoramic spectroscopy at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences and by mapping emission lines in a narrow passband of 13 Å with the MaNGaL instrument at the 2.5-m telescope of the Caucasus Mountain Observatory of the Sternberg Astronomical Institute of the Lomonosov Moscow State University, we have investigated the gaseous component of the giant lenticular galaxy NGC 934. The gas kinematics in the galaxy has turned out to disagree completely with the stellar kinematics, suggesting recent accretion of a large amount of cold gas by the galaxy. Weak star formation proceeds in the accreted gas on the periphery of the galaxy, mainly in a ring of radius 26 kpc, which may promise the buildup of a giant low-surface-brightness stellar disk in this early-type galaxy. The gas metallicity in the star formation ring is nearly solar: the accretion source is most likely the swallowing of a massive gas-rich satellite.

中文翻译：

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S0 星系 NGC 934 中的反向旋转气态盘和恒星形成

摘要

在俄罗斯科学院特殊天体物理观测站的 6 米望远镜上使用长缝全景光谱，并在高加索山 2.5 米望远镜上使用 MaNGaL 仪器绘制 13 Å 窄通带中的发射线图在罗蒙诺索夫莫斯科国立大学斯滕伯格天文研究所的天文台，我们研究了巨型透镜状星系 NGC 934 的气体成分。事实证明，该星系中的气体运动学与恒星运动学完全不一致，这表明最近有一个巨大的吸积物星系中冷气体的数量。弱恒星的形成在星系外围的吸积气体中进行，主要是在半径为 26 kpc 的环中，这可能预示着在这个早期型星系中会形成巨大的低表面亮度恒星盘。