The HI gas and star formation in star-forming galaxies selected from ALFALFA

The HI gas and star formation in star-forming galaxies selected from ALFALFA
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选自 ALFALFA 的恒星形成星系中的 HI 气体和恒星形成

DOI:
10.1088/1674-4527/21/5/123
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发表时间:
2021-06
影响因子:
1.8
通讯作者:
Zhou Zhimin
Zhou Zhimin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Lei Fengjie;Wu Hong;Zhu Yinan;Lam Man I;Zhou Zhimin

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本文给出了从α.40 - SDSS星表中随机选取的169个星系的Hα成像结果,其中排除了B带中心表面亮度(μ 0(B))小于22.5 mag arcsec~(-2)的低表面亮度星系。利用国家天文台兴隆天文台2.16 m望远镜观测了它们的Hα和R波段像,本文的主要目标是给出这些星系的性质,以及Hα通量和星星形成、气体、恒星质量-表面密度的关系,另外,我们还证实了ALOFA星系中H α含量、恒星质量和星星形成之间的相关性:H α质量随恒星质量的增加而增加,H α通量随恒星质量的增加而增加。恒星质量越大,斜率越慢。总的趋势是,比星星形成率(sSFR)随着恒星质量的增加而降低,当恒星质量接近10~ 1000 m时,sSFR急剧下降(10.3)~ 10~(10.5)M_(HI). SFR/M_(HI)与M_(HI)之间的弱相关性表明HI对星星的形成贡献很小。遵循重新修订的Kennicutt-Schmidt定律以及Kennicutt-Schmidt定律。
This paper presents the results of Hα imaging of 169 galaxies randomly selected from the α.40 - SDSS catalog.The sample has excluded all low surface brightness galaxies(LSBGs)whose central surface brightness in B band(µ_0(B))fainter than 22.5 mag arcsec~(-2).It can be used as the counterparts sample to LSBGs.We observed their Hα and R band images by using the 2.16 m telescope at the Xinglong Observatory of the National Astronomical Observatories,Chinese Academy of Sciences(NAOC).The main goal of this work is to present the properties of those galaxies,together with Hα flux and star formation-,gas-,stellar mass- surface density.In addition,we confirm the correlations among HI content,stellar mass and star formation in ALFALFA galaxies.The HI mass increases with stellar mass,and the slope slows down at the higher stellar mass.The overall trend was that the specific star formation rate(sSFR)decreases with stellar mass,and the sSFR dropped sharply when the stellar mass is close to 10~(10.3)~ 10~(10.5)M_⊙.The weak correlation between SFR/M_(HI)and M_(HI)implies the HI contribute little to star formation.Our sample,which are mostly star-forming galaxies,follows the revisited Kennicutt-Schmidt law as well as the Kennicutt-Schmidt law.
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