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

  • Tetsuo Hasegawa (a1), Fumio Sato (a2) and Yasuo Fukui (a3)

Abstract

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.

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Copyright

References

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Sato, F., Fukui, Y., and Hasegawa, T. 1979, this issue.
Westerhout, G. 1973, Maryland-Green Bank Galactic 21-cm Line Survey, (University of Maryland, College Park, Maryland), 3rd ed.
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