A large-scale CO survey of the galactic center

Tomoharu Oka, Tetsuo Hasegawa, Fumio Sato, Masato Tsuboi, Atsushi Miyazaki

研究成果: Article査読

180 被引用数 (Scopus)


We present high-resolution CO images of the Galactic center region taken with the 2 × 2 focal-plane array receiver mounted on the 45 m telescope of Nobeyama Radio Observatory. We have collected about 44,000 12C16O (J = 1-0) spectra and over 13,000 13C16O (J = 1-0) spectra with a 34″ (1.4 pc) grid spacing. The 12CO mapping area is roughly - 1°.5 ≤ l ≤ + 3°.4 and -0°.6 ≤ b ≤ +0°.6, which covers almost the full extent of the molecular gas concentration in the Galactic center. These CO images demonstrate extremely complex distribution and kinematics of molecular gas in the Galactic center. While its large-scale behavior can be attributed to the well-known coherent features, bright CO emission arises from a number of compact (d ≤ 10 pc) clouds with large velocity widths (ΔV ≥ 30 km s-1). The small-scale structure of molecular gas is characterized by filaments, arcs, and shells. The boisterous molecular gas kinematics there may be a result of violent release of kinetic energy by a number of supernova explosions and/or Wolf-Rayet stellar winds.

ジャーナルAstrophysical Journal, Supplement Series
出版ステータスPublished - 1998 10月 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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