星暴矮星系NGC 5253周围的中性氢气体分布  

HI distribution in dwarf starburst galaxy NGC 5253

作　　者：沃佳怡 蔡肇伟 左沛 陈天禄[1,2] WO Jiayi;TSAI Chao-Wei;ZUO Pei;CHEN Tianlu(Key Laboratory of Cosmic Rays of Ministry of Education,Tibet University,Lhasa 850000,China;Department of Physics,College of Science,Tibet University,Lhasa 850000,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China;CAS Key Laboratory of FAST,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China)

机构地区：[1]西藏大学宇宙线教育部重点实验室,拉萨850000 [2]西藏大学理学院物理系,拉萨850000 [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,北京101408 [5]中国科学院FAST重点实验室,北京100101 [6]北京大学科维理天文与天体物理研究所,北京100871

出　　处：《中国科学院大学学报（中英文）》2024年第2期188-194,共7页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(12041302,11903003,11873005,12147218)资助。

摘　　要：中性氢(HI)气体是恒星形成的基本物质,驱动着星系的演化。对于星暴矮星系NGC 5253,过去的研究利用射电干涉阵观测到的HI气体呈不对称分布,向东北方向延伸约7 kpc。这一延展结构可能表明NGC 5253与其附近的旋涡星系M 83之间存在动力学联系。为研究这两个星系之间可能存在的HI气体连接,从绿岸望远镜获得了射电L波段对NGC 5253周围的HI成图数据,探测到NGC 5253和M 83之间可能存在的7个HI气体云团。这些HI气体云团候选体主要分布在东北方向,由NGC 5253延展至距离超过60 kpc外。这些气体云团可能在触发矮星系NGC 5253剧烈的恒星形成活动中发挥重要作用。Neutral hydrogen(HI)gas is the fundamental material for star formation that drives the evolution of a galaxy.For starburst dwarf galaxy NGC 5253,previous study has observed HI gas distributed asymmetrically with~7 kpc extension toward north-east direction using the radio interferometry.This extension is likely indicating the dynamical connection between NGC 5253 and its nearby spiral galaxy M 83.To investigate the possible HI bridge between these two galactic systems,we acquire the HI mapping data around NGC 5253 in radio L-band from the Robert C.Byrd Green Bank Telescope.We have detected the 7 possible HI gas clouds between NGC 5253 and M 83.These HI gas cloud candidates distribute mainly in the north-east direction extending over 60 kpc from NGC 5253.These clouds could play an important role in triggering intensive star formation activity in the dwarf galaxy NGC 5253.

关 键 词：星系相互作用 恒星形成 中性氢气体 NGC 5253 

分 类 号：P157.7[天文地球—天文学]