Elucidation of whole picture of an interstellar gas near solar system

2015 Fiscal Year Final Research Report

• Project/Area Number: 25287035
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Nagoya University
• Principal Investigator: YAMAMOTO HIROAKI 名古屋大学, 理学(系)研究科(研究院), 助教 (70444396)
• Co-Investigator(Kenkyū-buntansha): FUKUI YASUO 名古屋大学, 大学院理学研究科, 教授 (30135298) ; KUWAHARA TOSHIHISA 名古屋大学, 大学院理学研究科, 研究員 (80648303) ; SANO HIDETOSHI 名古屋大学, 大学院理学研究科, 特任助教 (50739472)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 分子雲 / 太陽系近傍 / ダークガス / プランク

Outline of Final Research Achievements

The comparative study among the optical depth and temperature of interstellar grain, and intensity of atomic hydrogen (HI) and carbon monoxide has been carried out toward the region at high galactic latitude (near solar system). It is found that an optically thick HI gas is more abundant than the gas previously thought and is extended around molecular clouds. The optical depth and spin temperature of 1-2 and ~30 K is dominant. Dark gas which is considered not to be able to trace by atomic or molecular line emission directory can be explained by the optically thick HI gas.

Free Research Field

電波天文学