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.
作者
沃佳怡
蔡肇伟
左沛
陈天禄
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)
出处
《中国科学院大学学报（中英文）》
CAS
CSCD
北大核心
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。
