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Atomic Hydrogen in and around the Giant Molecular Cloud Near W3 and W4

Published online by Cambridge University Press:  14 August 2015

Tetsuo Hasegawa ,
Fumio Sato  and
Yasuo Fukui
Tetsuo Hasegawa
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo, Japan
Fumio Sato
Affiliation:
Chiba Prefecture Education Center, Katsuragi-2, Chiba, Japan
Yasuo Fukui
Affiliation:
Tokyo Astronomical Observatory, Mitaka, Tokyo, Japan

Abstract

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Cold HI gas appears as self-absorption dips in the 21-cm line profiles in and around the giant molecular cloud near W3 and W4. The cold HI cloud is ∼150 pc long and extends along the galactic plane. It consists of several fragments, each of which is typically ∼25 pc in diameter and (1 − 4) × 104 M⊙ in mass. The [H2]/[HI] ratio is estimated to be 15 – 50. The mass of the entire HI cloud amounts to ∼105 M⊙, which is comparable to that observed in CO emission.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 159 - 162
Copyright
Copyright © Reidel 1980 

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