Fujia Li, Enci Wang, Ming Zhu, Ying-jie Peng, Jing Wang, Chuan-Peng Zhang, Zesen Lin, Yu Rong, Hong-xin Zhang and Xu Kong
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引用次数: 0
摘要
我们利用FAST全天空H i巡天(FASHI)和Arecibo Legacy Fast ALFA(ALFALFA)巡天的数据库,分析了一个罕见群体的性质,即具有大量H i气体的强凸起为主的早期型星系(sBDEs)。我们从斯隆数字巡天中挑选出sBDEs,并与FASHI-ALFALFA联合H i样本进行交叉匹配,最终得到104个富含H i的sBDEs。这些sBDEs往往具有极高的H i储量,这在ATLAS3D等以往的研究中是很少见的。在这些被选中的sBDEs中,共有70%被归类为静止星系,尽管它们具有很大的H i储量。我们主要从恒星群、气相金属性、堆叠H i光谱和环境四个方面研究了这些sBDEs的性质。大多数富含H i的sBDEs似乎显示出较低的气相金属性,并且位于密度明显较低的环境中,这表明它们的H i气体来源于外部。我们发现,与普通恒星形成星系相比,恒星形成的小溴化二苯醚在统计上显示出更高的恒星形成效率和稍老的恒星群,这表明恒星形成的时间尺度为 Gyr。与对照恒星形成星系相比,它们还显示出更窄、更集中的 H i 曲线,这可能是它们恒星形成效率较高的原因。
Exploring the Origin of Cold Gas and Star Formation in a Rare Population of Strongly Bulge-dominated Early-type Galaxies
We analyze the properties of a rare population, the strongly bulge-dominated early-type galaxies (sBDEs) with significant H i gas, using the databases from the FAST All Sky H i survey (FASHI) and the Arecibo Legacy Fast ALFA (ALFALFA) survey. We select the sBDEs from the Sloan Digital Sky Survey and crossmatch with the FASHI-ALFALFA combined H i sample, resulting in 104 H i-rich sBDEs. These sBDEs tend to have extremely high H i reservoirs, which is rare in previous studies such as ATLAS3D. A total of 70% of the selected sBDEs are classified as quiescent galaxies, even though they have a large H i reservoir. We study the properties of these sBDEs from four main aspects: stellar population, gas-phase metallicity, stacked H i spectra, and environment. The majority of H i-rich sBDEs appear to show lower gas-phase metallicity and are located in significantly lower-density environments, suggesting an external origin for their H i gas. We find that star-forming sBDEs exhibit statistically higher star formation efficiency and slightly older stellar populations compared to normal star-forming galaxies, suggesting a recent star formation on the Gyr timescale. They also show narrower and more concentrated H i profiles compared to control star-forming galaxies, which may explain their higher star formation efficiency.