IRAS 23385+6053中的年轻星体外向流活动及气体热特性(英文)  

Outflow Activity of a YSO and Thermal Properties of the Gas in IRAS 23385+6053

作　　者：杨传义[1] 吴月芳[2] 

机构地区：[1]中国科学院上海天文台,上海200030 [2]中国科学院-北京大学联合北京天体物理中心

出　　处：《天体物理学报》2000年第2期141-147,共7页

基　　金：国家自然科学基金;中国科学院射电联合实验室资助

摘　　要：对ＩＲＡＳ ２３３８５＋６０５３进行了^(１２)ＣＯ Ｊ＝ １—０的成图观测，获得的谱线具有较宽的线翼，显示出其中高速气体的存在，证认其为外向流．对外向流参数及其驱动源的分析表明，它是一个与大质量年轻星体相关的高质量、高能量的外向流．利用ＣＯ谱线测量作为Ｔ_(k)的探测手段，对环境气体的热特性也进行了研究．Ｔ_(Ｋ)和Ｔ_(Ｄ)的比较表明，靠近这个红外源处不满足标准的Ｇｏｌｄｒｅｉｃｈ－Ｋｗａｎ能量图像，对其可能存在的加热机制进行了讨论．^(12)CO J = 1 - 0 mapping observations were made towards IRAS 23385+6053. The broad line wings observed revealed the presence of high-velocity gas activity in this source, which is identified as an outflow for the first time. The outflow parameters derived and the analysis of its driving source show it to be a massive, energetic outflow associated with a young stellar object (YSO) of very high mass. Using CO line measurements as a TK probe, the thermal properties of the ambient gas are also investigated.A comparison between Tk and TD shows that near this IRAS source the standard Goldreich-Kwan picture of energetic is not satisfied.Therefore alternative heating mechanisms are discussed.

关 键 词：星际分子 外向流 恒星形成 气体热特性 年轻星体 

分 类 号：P142[天文地球—天体物理]