报告摘要：To trace the chemical evolution of galaxies, a detailed knowledge of abundance patterns is fundamental. Isotope ratios play a key role in such studies and are, almost exclusively, a domain of radio and (sub-)mm astronomy. Even though interstellar carbon isotope ratios are locally understood, in extragalactic space beyond the Magellanic Clouds they are almost unexplored. We lack information on objects outside the Local Group of galaxies tracing environments that drastically differ from those in the Milky Way and the Large Magellanic Cloud. We do not know whether our Galaxy is typical for its class of objects or whether its isotopic properties are exceptional. What would the latter imply? Moreover, will we see strong variations in isotopic ratios when observing nearby galaxies with high angular resolution? In this talk, I will present a measurement of carbon isotope ratio in three nearby starburst galaxies making use of the 3 mm 12CN and 13CN lines in the ALMA Band 3.

报告人简介：
汤新弟，中国科学院新疆天文台研究员，博士生导师。2014年博士毕业于中国科学院大学，2015-2018年在德国马克斯普朗克射电天文研究所进行博士后研究。主要研究工作涉及星际介质、分子云、恒星形成等。使用APEX、JCMT、IRAM、ALMA 等望远镜开展系统的观测研究工作，在恒星形成区气体加热机制、分子云物理化学性质、及银河系和近邻星系中元素同位素丰度比等研究方向取得系列研究成果。已在国内外天文核心杂志发表论文近70篇。主持和参与国家、省部科研项目11项。入选国家海外高层次人才引进计划、新疆天山英才科技创新领军人才和新疆天池百人计划。获中国科学院院长优秀奖、新疆青年科技奖、新疆杰出青年科学基金等。