Title: Physical conditions around 6.7 GHz methanol masers-I: Ammonia Show Chinese title

Title: 6.7 GHz 甲醇激波的物理条件——I：氨

Abstract: Methanol masers at 6.7 GHz are known to be tracers of high-mass star formation in our Galaxy. In this paper, we study the large scale physical conditions in the star forming clumps/cores associated with 6.7 GHz methanol masers using observations of the (1,1), (2,2) and (3,3) inversion transitions of ammonia with the Effelsberg telescope. The gas kinetic temperature is found to be higher than in infrared dark clouds, highlighting the relatively evolved nature of the maser sources. Other than a weak correlation between maser luminosity and the ammonia line width, we do not find any differences between low and high luminosity methanol masers. Show Chinese abstract

Abstract: 6.7 GHz 的甲醇激波器已被知为银河系中高质量恒星形成的一种示踪剂。 在本文中，我们利用 Effelsberg 望远镜对氨的 (1,1)、(2,2) 和 (3,3) 反转跃迁的观测研究了与 6.7 GHz 甲醇激波器相关的恒星形成团块/核区的大尺度物理条件。发现气体的动能温度高于红外暗云，突显了激波器源相对演化的性质。 除了激波器亮度和氨线宽之间存在弱相关性外，我们没有发现低亮度和高亮度甲醇激波器之间的任何差异。