Search for the CO-dark mass in the central molecular zone by using the ASTE 10-m telescope

研究成果: Article査読

抄録

Atomic carbon (C0) is one of the most abundant carbon-bearing species in the interstellar molecular gas, and its submillimeter lines are good tracers of low-density molecular clouds which are often dark in CO rotational lines. We present a new map of the central 150 pc region of the Milky Way in the 500 GHz [CI] line, which has been recently obtained with the ASTE 10-m telescope. The [CI] emission is brightest toward the central 5-pc region, where massive GMCs are absent. This [CI]-bright region is approximately centered toward Sgr A∗, covering the entire circum-nuclear ring (CND) and the western part of the 50-km/s cloud. The C0/CO abundance ratio is 0.5-2 there, and the highest ratio is observed toward the CND but just outside of the 2-pc ring of dense gas. This discovery may suggest that the CO-dark component occupies a significant fraction of the molecular gas in the circumnuclear region.

本文言語English
ページ(範囲)107-110
ページ数4
ジャーナルProceedings of the International Astronomical Union
11
DOI
出版ステータスPublished - 2016

ASJC Scopus subject areas

  • 医学(その他)
  • 天文学と天体物理学
  • 栄養および糖尿病
  • 公衆衛生学、環境および労働衛生
  • 宇宙惑星科学

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