A hyperenergetic CO shell in the Galactic center molecular cloud complex

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

doi:10.1093/pasj/53.5.787

A hyperenergetic CO shell in the Galactic center molecular cloud complex

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

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

We report on the detection of a high-velocity feature, CO 1.27+0.01, in the Galactic-center molecular-cloud complex. In our ¹²CO images taken with the NRO 45m telescope, CO 1.27+0.01 appears as the second prominent high-velocity feature, next to CO 0.02-0.02, having a velocity width of Δ V ≃ 100kms^-1 and a size of 9pc × 12pc. It seems to consist of two expanding shells with sizes of ∼ 10 pc. The major shell has a kinetic energy of about an order of magnitude larger than the gravitational energy, indicating that the shell is apparently gravitationally unbound. We propose that CO 1.27+0.01 may have been accelerated by a series of supernova explosions which occurred within the last ∼ 6 × 10⁴ yr. No association of a nonthermal radio continuum source suggests a strong magnetic field (B ≳ 0.4mG) in the vicinity of CO 1.27+0.01.

Original language	English
Pages (from-to)	787-791
Number of pages	5
Journal	Publications of the Astronomical Society of Japan
Volume	53
Issue number	5
DOIs	https://doi.org/10.1093/pasj/53.5.787
Publication status	Published - 2001 Oct 25
Externally published	Yes

Keywords

Galaxies: nuclei
Galaxy: center
Ism: clouds
Ism: molecules

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/pasj/53.5.787

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title = "A hyperenergetic CO shell in the Galactic center molecular cloud complex",

abstract = "We report on the detection of a high-velocity feature, CO 1.27+0.01, in the Galactic-center molecular-cloud complex. In our 12CO images taken with the NRO 45m telescope, CO 1.27+0.01 appears as the second prominent high-velocity feature, next to CO 0.02-0.02, having a velocity width of Δ V ≃ 100kms-1 and a size of 9pc × 12pc. It seems to consist of two expanding shells with sizes of ∼ 10 pc. The major shell has a kinetic energy of about an order of magnitude larger than the gravitational energy, indicating that the shell is apparently gravitationally unbound. We propose that CO 1.27+0.01 may have been accelerated by a series of supernova explosions which occurred within the last ∼ 6 × 104 yr. No association of a nonthermal radio continuum source suggests a strong magnetic field (B ≳ 0.4mG) in the vicinity of CO 1.27+0.01.",

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author = "Tomoharu Oka and Tetsuo Hasegawa and Fumio Sato and Masato Tsuboi and Atsushi Miyazaki",

year = "2001",

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language = "English",

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T1 - A hyperenergetic CO shell in the Galactic center molecular cloud complex

AU - Oka, Tomoharu

AU - Hasegawa, Tetsuo

AU - Sato, Fumio

AU - Tsuboi, Masato

AU - Miyazaki, Atsushi

PY - 2001/10/25

Y1 - 2001/10/25

N2 - We report on the detection of a high-velocity feature, CO 1.27+0.01, in the Galactic-center molecular-cloud complex. In our 12CO images taken with the NRO 45m telescope, CO 1.27+0.01 appears as the second prominent high-velocity feature, next to CO 0.02-0.02, having a velocity width of Δ V ≃ 100kms-1 and a size of 9pc × 12pc. It seems to consist of two expanding shells with sizes of ∼ 10 pc. The major shell has a kinetic energy of about an order of magnitude larger than the gravitational energy, indicating that the shell is apparently gravitationally unbound. We propose that CO 1.27+0.01 may have been accelerated by a series of supernova explosions which occurred within the last ∼ 6 × 104 yr. No association of a nonthermal radio continuum source suggests a strong magnetic field (B ≳ 0.4mG) in the vicinity of CO 1.27+0.01.

AB - We report on the detection of a high-velocity feature, CO 1.27+0.01, in the Galactic-center molecular-cloud complex. In our 12CO images taken with the NRO 45m telescope, CO 1.27+0.01 appears as the second prominent high-velocity feature, next to CO 0.02-0.02, having a velocity width of Δ V ≃ 100kms-1 and a size of 9pc × 12pc. It seems to consist of two expanding shells with sizes of ∼ 10 pc. The major shell has a kinetic energy of about an order of magnitude larger than the gravitational energy, indicating that the shell is apparently gravitationally unbound. We propose that CO 1.27+0.01 may have been accelerated by a series of supernova explosions which occurred within the last ∼ 6 × 104 yr. No association of a nonthermal radio continuum source suggests a strong magnetic field (B ≳ 0.4mG) in the vicinity of CO 1.27+0.01.

KW - Galaxies: nuclei

KW - Galaxy: center

KW - Ism: clouds

KW - Ism: molecules

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JO - Publication of the Astronomical Society of Japan

JF - Publication of the Astronomical Society of Japan

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ER -

A hyperenergetic CO shell in the Galactic center molecular cloud complex

Abstract

Keywords

ASJC Scopus subject areas

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