Study of the filamentary infrared dark cloud G192.76+00.10 in the S254–S258 OB complex  

作　　者：Olga L.Ryabukhina Igor I.Zinchenko Manash R.Samal Petr M.Zemlyanukha Dmitry A.Ladeyschikov Andrej M.Sobolev Christian Henkel Devendra K.Ojha 

机构地区：[1]Institute of Applied Physics of the Russian Academy of Sciences,Nizhny Novgorod,Russia [2]Lobachevsky State University of Nizhni Novgorod,Nizhny Novgorod,Russia [3]Institute of Astronomy,National Central University,Taoyuan City [4]Kourovka Astronomical Observatory,Ural Federal University,Ekaterinburg,Russia [5]Max Planck Institute for Radio Astronomy,Bonn,Germany [6]Astron.Dept.,King Abdulaziz University,Jeddah,Saudi Arabia [7]Tata Institute of Fundamental Research,Mumbai,India

出　　处：《Research in Astronomy and Astrophysics》2018年第8期53-62,共10页天文和天体物理学研究（英文版）

基　　金：supported by the Russian Foundation for Basic Research(Grant Nos.15–02–06098 and 17–52–45020)in part of the observations and preliminary data reduction;by the Russian Science Foundation(Grant No.17–12–01256)in part of the data analysis

摘　　要：We present results of a high resolution study of the filamentary infrared dark cloud G192.76＋00.10 in the S254-S258 OB complex in several molecular species tracing different physical conditions. These include three isotopologues of carbon monoxide （CO）, ammonia （NH3） and carbon monosulfide （CS）. The aim of this work is to study the general structure and kinematics of the filamen- tary cloud, and its fragmentation and physical parameters. The gas temperature is derived from the NH3 （J, K） = （1, 1）, （2, 2） and 12CO（2-1） lines, and the 13CO（1-0）, 13CO（2-1） emission is used to inves- tigate the overall gas distribution and kinematics. Several dense clumps are identified from the CS（2-1） data. Values of the gas temperature lie in the range 10 - 35 K, and column density N（H2） reaches the value 5.1 ×1022 cm-2. The width of the filament is of order 1 pc. The masses of the dense clumps range from ×30 M⊙ to - 160 M⊙. They appear to be gravitationally unstable. The molecular emission shows a gas dynamical coherence along the filament, The velocity pattern may indicate longitudinal collapse.We present results of a high resolution study of the filamentary infrared dark cloud G192.76＋00.10 in the S254-S258 OB complex in several molecular species tracing different physical conditions. These include three isotopologues of carbon monoxide （CO）, ammonia （NH3） and carbon monosulfide （CS）. The aim of this work is to study the general structure and kinematics of the filamen- tary cloud, and its fragmentation and physical parameters. The gas temperature is derived from the NH3 （J, K） = （1, 1）, （2, 2） and 12CO（2-1） lines, and the 13CO（1-0）, 13CO（2-1） emission is used to inves- tigate the overall gas distribution and kinematics. Several dense clumps are identified from the CS（2-1） data. Values of the gas temperature lie in the range 10 - 35 K, and column density N（H2） reaches the value 5.1 ×1022 cm-2. The width of the filament is of order 1 pc. The masses of the dense clumps range from ×30 M⊙ to - 160 M⊙. They appear to be gravitationally unstable. The molecular emission shows a gas dynamical coherence along the filament, The velocity pattern may indicate longitudinal collapse.

关 键 词：STARS formation - ISM clouds - ISM molecules - ISM individual objects （G192.76＋00.10） 

分 类 号：P144[天文地球—天体物理]