A large-scale CO survey of the galactic center

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

Research output: Contribution to journalArticle

152 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)455-515
Number of pages61
JournalAstrophysical Journal, Supplement Series
Volume118
Issue number2
DOIs
Publication statusPublished - 1998 Oct
Externally publishedYes

Fingerprint

molecular gases
gas
kinematics
wolves
stellar winds
focal plane devices
kinetic energy
supernovae
explosions
explosion
filaments
observatories
spacing
observatory
arcs
receivers
grids
telescopes
shell
radio

Keywords

  • Galaxy: center
  • Galaxy: kinematics and dynamics
  • ISM: molecules
  • Surveys

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Oka, T., Hasegawa, T., Sato, F., Tsuboi, M., & Miyazaki, A. (1998). A large-scale CO survey of the galactic center. Astrophysical Journal, Supplement Series, 118(2), 455-515. https://doi.org/10.1086/313138

A large-scale CO survey of the galactic center. / Oka, Tomoharu; Hasegawa, Tetsuo; Sato, Fumio; Tsuboi, Masato; Miyazaki, Atsushi.

In: Astrophysical Journal, Supplement Series, Vol. 118, No. 2, 10.1998, p. 455-515.

Research output: Contribution to journalArticle

Oka, T, Hasegawa, T, Sato, F, Tsuboi, M & Miyazaki, A 1998, 'A large-scale CO survey of the galactic center', Astrophysical Journal, Supplement Series, vol. 118, no. 2, pp. 455-515. https://doi.org/10.1086/313138
Oka, Tomoharu ; Hasegawa, Tetsuo ; Sato, Fumio ; Tsuboi, Masato ; Miyazaki, Atsushi. / A large-scale CO survey of the galactic center. In: Astrophysical Journal, Supplement Series. 1998 ; Vol. 118, No. 2. pp. 455-515.
@article{8e0c133de4964c5f89c3f5efe856af05,
title = "A large-scale CO survey of the galactic center",
abstract = "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.",
keywords = "Galaxy: center, Galaxy: kinematics and dynamics, ISM: molecules, Surveys",
author = "Tomoharu Oka and Tetsuo Hasegawa and Fumio Sato and Masato Tsuboi and Atsushi Miyazaki",
year = "1998",
month = "10",
doi = "10.1086/313138",
language = "English",
volume = "118",
pages = "455--515",
journal = "Astrophysical Journal, Supplement Series",
issn = "0067-0049",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - A large-scale CO survey of the galactic center

AU - Oka, Tomoharu

AU - Hasegawa, Tetsuo

AU - Sato, Fumio

AU - Tsuboi, Masato

AU - Miyazaki, Atsushi

PY - 1998/10

Y1 - 1998/10

N2 - 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.

AB - 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.

KW - Galaxy: center

KW - Galaxy: kinematics and dynamics

KW - ISM: molecules

KW - Surveys

UR - http://www.scopus.com/inward/record.url?scp=0032336112&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032336112&partnerID=8YFLogxK

U2 - 10.1086/313138

DO - 10.1086/313138

M3 - Article

VL - 118

SP - 455

EP - 515

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

SN - 0067-0049

IS - 2

ER -