河外星系NGC 0925中氢二二区的光谱观测研究  

Spectroscopy of one HⅡregion in the external galaxy NGC 0925

作　　者：王舒婷 吴啟明 袁淇 郑映慧 方凤娜 毛业伟 WANG Shu-ting;WU Qi-ming;YUAN Qi;ZHENG Ying-hui;FANG Feng-na;MAO Ye-wei(Center for Astrophysics,Guangzhou 510006,China;School of Physics and Materials Science,Guangzhou Univesity,Guangzhou 510006,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory for Particle Astrophysics,Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]广州大学天体物理中心,广东广州510006 [2]广州大学物理与材料科学学院,广东广州510006 [3]中国科学院国家天文台,北京100101 [4]中国科学院大学天文与空间科学学院,北京100049 [5]中国科学院高能物理研究所粒子天体物理重点实验室,北京100049

出　　处：《广州大学学报（自然科学版）》2023年第5期72-83,F0002,共13页Journal of Guangzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目(U2031106,U2031201);广州大学省级大学生创新训练资助项目(S202011078107)。

摘　　要：氢二区是星系中恒星形成的场所,最显著的观测特征是光谱中的一系列发射线,光谱观测和分析是研究氢二区性质的主要途径。文章呈现的是利用国家天文台2.16 m望远镜对河外星系NGC 0925中的一个氢二区进行光谱观测、数据处理和测量以及分析的工作。基于观测到的光谱发射线,采用“巴尔默减幅”法得到星系内消光并作消光改正;利用Hα发射线的光度得到恒星形成率;利用强发射线方法得到氧元素丰度。结果显示,该氢二区的尘埃消光严重(V波段的尘埃消光A(V)=0.641 mag)、恒星形成活动性强(恒星形成率面密度∑_(SFR)=0.104 M⊙/yr/kpc^(2))、金属元素丰度高(氧元素丰度12+log(O/H)=8.337 dex)。HⅡregions are where star formation takes place in galaxies.The most prominent observational characteristic of HⅡregions is a series of emission lines in a spectra.Spectral observations and analysis are the main approach to investigating HⅡregions.This paper presents the work on a spectral observation of one HⅡregion in the external galaxy NGC 0925,taken with the 2.16 m telescope at the National Astronomical Observatories,as well as data reduction,measurement and analysis.On the basis of the observed emission lines,for this HⅡregion,we obtain dust attenuation and make attenuation correction by using the“Balmer Decrement”method;we derive star formation rate from the luminosity of the Hαemission line;we estimate the oxygen abundance with the strong-line diagnostics.The results show that,this H II region is heavily obscured(the dust attenuation at the V band A(V)=0.641 mag),actively forming stars(the star formation rate surface density∑_(SFR)=0.104 M⊙/yr/kpc^(2)),and rich in metal content(the oxygen abundance 12+log(O/H)=8.337 dex).

关 键 词：光谱仪 光谱学观测研究 氢二区 谱线和波段 个源星系(NGC 0925) 

分 类 号：P141.5[天文地球—天体物理]