A high-velocity molecular cloud near the center of the Galaxy

Tomoharu Oka, Glenn J. White, Tetsuo Hasegawa, Fumio Sato, Masato Tsuboi, Atsushi Miyazaki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report the detection of a peculiar molecular cloud, CO 0.02-0.02, lying about 5′ Galactic east from the center of the Galaxy. 12CO images taken with Nobeyama Radio Observatory (NRO) 45 m telescope showed that it is relatively compact (∼3 × 4 pc2) as well as having a very large velocity width (ΔV ≥ 100 km s-1). The cloud has a virial mass about 1 order of magnitude larger than the LTE mass, 9 × 104 M, indicating the cloud is apparently gravitationally unbound. New observations with the James Clerk Maxwell Telescope 15 m and the NRO 45 m telescopes show that CO 0.02-0.02 is very bright in the CO (J = 3-2) and in the HCN and HCO+ (J = 1-0) lines. It appears that the environment may have an unusually high density and temperature, which may be related to the very broad CO line width. We propose that CO 0.02 -0.02 may have been accelerated, heated, and compressed in a series of supernovae shocks that have occurred within the last (3-5) × 104 yr.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalAstrophysical Journal
Volume515
Issue number1 PART 1
Publication statusPublished - 1999 Apr 10
Externally publishedYes

Fingerprint

molecular clouds
observatory
telescopes
radio
galaxies
observatories
local thermodynamic equilibrium
supernovae
shock
temperature
detection

Keywords

  • Galaxy: center
  • ISM: clouds
  • ISM: molecules

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Oka, T., White, G. J., Hasegawa, T., Sato, F., Tsuboi, M., & Miyazaki, A. (1999). A high-velocity molecular cloud near the center of the Galaxy. Astrophysical Journal, 515(1 PART 1), 249-255.

A high-velocity molecular cloud near the center of the Galaxy. / Oka, Tomoharu; White, Glenn J.; Hasegawa, Tetsuo; Sato, Fumio; Tsuboi, Masato; Miyazaki, Atsushi.

In: Astrophysical Journal, Vol. 515, No. 1 PART 1, 10.04.1999, p. 249-255.

Research output: Contribution to journalArticle

Oka, T, White, GJ, Hasegawa, T, Sato, F, Tsuboi, M & Miyazaki, A 1999, 'A high-velocity molecular cloud near the center of the Galaxy', Astrophysical Journal, vol. 515, no. 1 PART 1, pp. 249-255.
Oka T, White GJ, Hasegawa T, Sato F, Tsuboi M, Miyazaki A. A high-velocity molecular cloud near the center of the Galaxy. Astrophysical Journal. 1999 Apr 10;515(1 PART 1):249-255.
Oka, Tomoharu ; White, Glenn J. ; Hasegawa, Tetsuo ; Sato, Fumio ; Tsuboi, Masato ; Miyazaki, Atsushi. / A high-velocity molecular cloud near the center of the Galaxy. In: Astrophysical Journal. 1999 ; Vol. 515, No. 1 PART 1. pp. 249-255.
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AU - White, Glenn J.

AU - Hasegawa, Tetsuo

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AU - Tsuboi, Masato

AU - Miyazaki, Atsushi

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N2 - We report the detection of a peculiar molecular cloud, CO 0.02-0.02, lying about 5′ Galactic east from the center of the Galaxy. 12CO images taken with Nobeyama Radio Observatory (NRO) 45 m telescope showed that it is relatively compact (∼3 × 4 pc2) as well as having a very large velocity width (ΔV ≥ 100 km s-1). The cloud has a virial mass about 1 order of magnitude larger than the LTE mass, 9 × 104 M⊙, indicating the cloud is apparently gravitationally unbound. New observations with the James Clerk Maxwell Telescope 15 m and the NRO 45 m telescopes show that CO 0.02-0.02 is very bright in the CO (J = 3-2) and in the HCN and HCO+ (J = 1-0) lines. It appears that the environment may have an unusually high density and temperature, which may be related to the very broad CO line width. We propose that CO 0.02 -0.02 may have been accelerated, heated, and compressed in a series of supernovae shocks that have occurred within the last (3-5) × 104 yr.

AB - We report the detection of a peculiar molecular cloud, CO 0.02-0.02, lying about 5′ Galactic east from the center of the Galaxy. 12CO images taken with Nobeyama Radio Observatory (NRO) 45 m telescope showed that it is relatively compact (∼3 × 4 pc2) as well as having a very large velocity width (ΔV ≥ 100 km s-1). The cloud has a virial mass about 1 order of magnitude larger than the LTE mass, 9 × 104 M⊙, indicating the cloud is apparently gravitationally unbound. New observations with the James Clerk Maxwell Telescope 15 m and the NRO 45 m telescopes show that CO 0.02-0.02 is very bright in the CO (J = 3-2) and in the HCN and HCO+ (J = 1-0) lines. It appears that the environment may have an unusually high density and temperature, which may be related to the very broad CO line width. We propose that CO 0.02 -0.02 may have been accelerated, heated, and compressed in a series of supernovae shocks that have occurred within the last (3-5) × 104 yr.

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