Recent Developments on the H_(I)Gas of Low-Redshift Galaxies Seen by the 21 cm Emission Lines  

作　　者：Jing Wang Xuchen Lin 王菁;林旭辰(Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China;Department of Astronomy,School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China [2]Department of Astronomy,School of Physics,Peking University,Beijing 100871,China

出　　处：《Chinese Physics Letters》2024年第10期152-165,共14页中国物理快报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant No.2022YFA1602902);the National Natural Science Foundation of China(Grant Nos.12073002,12233001,and 8200906879);the China Manned Space Project。

摘　　要：As a major interstellar medium,the atomic neutral hydrogen(H_(I))plays an important role in the galaxy evolution.It provides the ingredient for star formation,and sensitively traces the internal processes and external perturbations influencing the galaxy.With the beginning of many new radio telescopes and surveys,H_(I)may make a more significant contribution to the understanding of galaxies in the near future.This review discusses the major development of the 21 cm emission-line H_(I)observations and studies in the past few years,including its scaling relations with other galaxy properties,its kinematics and structures,its role in environmental studies,and its constraints on hydrodynamical simulations.The local-Universe H_(I)scaling relations of stellar-massselected samples extend smoothly to 10^(9)M⊙stellar mass,with a tentative evolution to the redshift of∼0.1.The development of measurement techniques enables better estimations of H_(I)non-circular motion,dispersion,and thickness,and new observations revealed extended or extra-planar H_(I)structures,both helpfully constraining the gas accretion,stellar feedback,and star formation processes of galaxy evolution models.H_(I)is very useful for tracing the satellite evolution in dense environments,the studies of which would benefit from ongoing blind H_(I)surveys.Though simulations still cannot fully reproduce H_(I)gas properties,they help to understand the role of possible factors in regulating H_(I)properties.

关 键 词：evolution. GALAXY STELLAR 

分 类 号：P152[天文地球—天文学]