Updated Inventory of Carbon Monoxide in the Taurus Molecular Cloud  

作　　者：Yan Duan Di Li Laurent Pagani Paul F.Goldsmith Tao-Chung Ching Chen Wang Jinjin Xie 

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Research Center for Intelligent Computing Platforms,Zhejiang Laboratory,Hangzhou 311100,China [4]NAOC-UKZN Computational Astrophysics Centre,University of KwaZulu-Natal,Durban4000,South Africa [5]LERMA&UMR 8112 du CNRS,Observatoire de Paris,PSL University,Sorbonne Universités,CNRS,F-75014 Paris,France [6]Jet Propulsion Laboratory,California Institute of Technology,4800 Oak Grove Drive,Pasadena,CA91109,USA [7]Jansky Fellow,National Radio Astronomy Observatory,1003 Lopezville Road,Socorro,NM 87801,USA [8]Shanghai Astronomical Observatory,Chinese Academy of Sciences National Astronomical Observatories,Chinese Academy of Sciences,Shanghai 200030,China

出　　处：《Research in Astronomy and Astrophysics》2023年第9期56-65,共10页天文和天体物理学研究（英文版）

基　　金：the National Natural Science Foundation of China(NSFC,grant Nos.11988101,11725313,and U1931117);the International Partnership Program of Chinese Academy of Sciences(grant No.114A11KYSB20210010);supported by the Natural Science Foundation of Jiangsu Province(grant No.BK20201108)。

摘　　要：The most extensive survey of carbon monoxide(CO)gas in the Taurus molecular cloud relied on ^(12)CO and ^(13)CO J=1→0 emission only,distinguishing the region where ^(12)CO is detected without ^(13)CO(named mask 1 region)from the one where both are detected(mask 2 region)(Goldsmith et al.2008;Pineda et al.2010).We have taken advantage of recent ^(12)CO J=3→2 James Clerk Maxwell Telescope observations,where they include mask 1regions to estimate density,temperature,and N(CO)with a large velocity gradient model.This represents 1395 pixels out of~1.2 million in the mark 1 region.Compared to Pineda et al.(2010)results and assuming a Tkin of 30 K,we find a higher volume density of molecular hydrogen of 3.3×10^(3) cm^(-3),compared to their 250-700 cm^(-3),and a CO column density of 5.7×10^(15)cm^(-2),about a quarter of their value.The differences are important and show the necessity to observe several CO transitions to better describe the intermediate region between the dense cloud and the diffuse atomic medium.Future observations to extend the ^(12)CO J=3→2 mapping further away from the ^(13)COdetected region comprising mask 1 are needed to revisit our understanding of the diffuse portions of dark clouds.

关 键 词：SUBMILLIMETER ISM-ISM clouds-ISM MOLECULES 

分 类 号：P148[天文地球—天体物理]