序列学术报告:ALMA Explorations of Warm Dense Molecular Gas in Nearby LIRGS

2019-01-17 03:08:22 威海天文台 点击:

报告时间: 7月31日(周四) 下午 14:30

报告地点: 空间科学与物理楼 南楼208

报告人:美国加州理工学院(Caltech)红外数据处理与分析中心(IPAC)

徐聪 (Cong Kevin Xu) 研究员

报告题目:ALMA Explorations of Warm Dense Molecular Gas in Nearby LIRGS

利用ALMA观测数据研究亮红外星系中的暖致密分子气体

报告摘要:I will present results of ALMA (Cycle-0) observations of the CO (6-5) line emission and the 435μm continuum of two nearby luminous infrared galaxies (LIRGs) NGC 34 and NGC 1614, selected from a Herschel FTS survey of 125 LIRGs. Using receivers in the highest frequency ALMA band available (Band-9), these observations achieved the best angular resolutions (~0.25") for ALMA Cycle-0 observations and resolved for the first time distributions of warm dense molecular gas (n > 10^5 cm^-3, T > 100K) in LIRGs with spatial resolutions better than 100 pc. Our ALMA data show a very tight correlation between the CO (6-5) line emission and cold dust continuum emission, suggesting the warm dense molecular gas dominating the ISM in LIRG nuclear regions. On the other hand, we saw very different spatial distributions and kinematic properties of warm dense gas in the two LIRGs, indicating that physical conditions in the ISM can be very different in different LIRGs. The relations between warm dense gas, star-formation, AGN, and the dependence of these relations on the merger history will be discussed.

注:ALMA(The Atacama Large Millimeter/Submillimeter Array,阿塔卡马大型毫米/亚毫米阵列)是目前世界上最大的天文观测设备,具体介绍请见:http://www.almaobservatory.org

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