ASTE CO J = 3-2 survey of the galactic center

Tomoharu Oka, Yui Onodera, Makoto Nagai, Kunihiko Tanaka, Shinji Matsumura, Kazuhisa Kamegai

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

We present high-resolution CO J = 3-2 maps of the Galactic center region, taken with the ASTE 10m telescope. We have collected approximately 30,000 spectra with a 34″ grid spacing. The mapping area is roughly -1°.8 < l < +35 and -08 < b < +0°.9, which includes the central molecular zone and Bania's Clump 2, covering almost the full extent of the molecular gas concentration in the Galactic center. These CO J = 3-2 images show a behavior similar to the CO J = 1-0 images with the same resolution. Molecular gas in the Galactic center shows a higher J = 3-2/J = 1-0 intensity ratio (0.7) than the gas in the spiral arms in the Galactic disk (∼0.4). The CO J = 3-2/CO J = 1-0 luminosity ratio is 0.71. We see several regions with very high J = 3-2/J = 1-0 intensity ratios exceeding 1.5, including the Sgr A, l = +13, l = -04, and l = -1°.2 regions. A number of small spots of high ratio gas are also found. Many of them have large velocity widths, indicating that they are spots of hot molecular gas shocked by unidentified supernovae and/or winds from massive stars.

Original languageEnglish
Article number14
JournalAstrophysical Journal, Supplement Series
Volume201
Issue number2
DOIs
Publication statusPublished - 2012 Aug

Fingerprint

molecular gases
gas
high temperature gases
clumps
massive stars
gases
supernovae
coverings
grids
luminosity
spacing
telescopes
high resolution

Keywords

  • galaxies: nuclei
  • Galaxy: center
  • ISM: clouds

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

ASTE CO J = 3-2 survey of the galactic center. / Oka, Tomoharu; Onodera, Yui; Nagai, Makoto; Tanaka, Kunihiko; Matsumura, Shinji; Kamegai, Kazuhisa.

In: Astrophysical Journal, Supplement Series, Vol. 201, No. 2, 14, 08.2012.

Research output: Contribution to journalArticle

Oka, Tomoharu ; Onodera, Yui ; Nagai, Makoto ; Tanaka, Kunihiko ; Matsumura, Shinji ; Kamegai, Kazuhisa. / ASTE CO J = 3-2 survey of the galactic center. In: Astrophysical Journal, Supplement Series. 2012 ; Vol. 201, No. 2.
@article{53104e2845684353b066efe1433669e0,
title = "ASTE CO J = 3-2 survey of the galactic center",
abstract = "We present high-resolution CO J = 3-2 maps of the Galactic center region, taken with the ASTE 10m telescope. We have collected approximately 30,000 spectra with a 34″ grid spacing. The mapping area is roughly -1°.8 < l < +35 and -08 < b < +0°.9, which includes the central molecular zone and Bania's Clump 2, covering almost the full extent of the molecular gas concentration in the Galactic center. These CO J = 3-2 images show a behavior similar to the CO J = 1-0 images with the same resolution. Molecular gas in the Galactic center shows a higher J = 3-2/J = 1-0 intensity ratio (0.7) than the gas in the spiral arms in the Galactic disk (∼0.4). The CO J = 3-2/CO J = 1-0 luminosity ratio is 0.71. We see several regions with very high J = 3-2/J = 1-0 intensity ratios exceeding 1.5, including the Sgr A, l = +13, l = -04, and l = -1°.2 regions. A number of small spots of high ratio gas are also found. Many of them have large velocity widths, indicating that they are spots of hot molecular gas shocked by unidentified supernovae and/or winds from massive stars.",
keywords = "galaxies: nuclei, Galaxy: center, ISM: clouds",
author = "Tomoharu Oka and Yui Onodera and Makoto Nagai and Kunihiko Tanaka and Shinji Matsumura and Kazuhisa Kamegai",
year = "2012",
month = "8",
doi = "10.1088/0067-0049/201/2/14",
language = "English",
volume = "201",
journal = "Astrophysical Journal, Supplement Series",
issn = "0067-0049",
publisher = "IOP Publishing Ltd.",
number = "2",

}

TY - JOUR

T1 - ASTE CO J = 3-2 survey of the galactic center

AU - Oka, Tomoharu

AU - Onodera, Yui

AU - Nagai, Makoto

AU - Tanaka, Kunihiko

AU - Matsumura, Shinji

AU - Kamegai, Kazuhisa

PY - 2012/8

Y1 - 2012/8

N2 - We present high-resolution CO J = 3-2 maps of the Galactic center region, taken with the ASTE 10m telescope. We have collected approximately 30,000 spectra with a 34″ grid spacing. The mapping area is roughly -1°.8 < l < +35 and -08 < b < +0°.9, which includes the central molecular zone and Bania's Clump 2, covering almost the full extent of the molecular gas concentration in the Galactic center. These CO J = 3-2 images show a behavior similar to the CO J = 1-0 images with the same resolution. Molecular gas in the Galactic center shows a higher J = 3-2/J = 1-0 intensity ratio (0.7) than the gas in the spiral arms in the Galactic disk (∼0.4). The CO J = 3-2/CO J = 1-0 luminosity ratio is 0.71. We see several regions with very high J = 3-2/J = 1-0 intensity ratios exceeding 1.5, including the Sgr A, l = +13, l = -04, and l = -1°.2 regions. A number of small spots of high ratio gas are also found. Many of them have large velocity widths, indicating that they are spots of hot molecular gas shocked by unidentified supernovae and/or winds from massive stars.

AB - We present high-resolution CO J = 3-2 maps of the Galactic center region, taken with the ASTE 10m telescope. We have collected approximately 30,000 spectra with a 34″ grid spacing. The mapping area is roughly -1°.8 < l < +35 and -08 < b < +0°.9, which includes the central molecular zone and Bania's Clump 2, covering almost the full extent of the molecular gas concentration in the Galactic center. These CO J = 3-2 images show a behavior similar to the CO J = 1-0 images with the same resolution. Molecular gas in the Galactic center shows a higher J = 3-2/J = 1-0 intensity ratio (0.7) than the gas in the spiral arms in the Galactic disk (∼0.4). The CO J = 3-2/CO J = 1-0 luminosity ratio is 0.71. We see several regions with very high J = 3-2/J = 1-0 intensity ratios exceeding 1.5, including the Sgr A, l = +13, l = -04, and l = -1°.2 regions. A number of small spots of high ratio gas are also found. Many of them have large velocity widths, indicating that they are spots of hot molecular gas shocked by unidentified supernovae and/or winds from massive stars.

KW - galaxies: nuclei

KW - Galaxy: center

KW - ISM: clouds

UR - http://www.scopus.com/inward/record.url?scp=84863829115&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84863829115&partnerID=8YFLogxK

U2 - 10.1088/0067-0049/201/2/14

DO - 10.1088/0067-0049/201/2/14

M3 - Article

AN - SCOPUS:84863829115

VL - 201

JO - Astrophysical Journal, Supplement Series

JF - Astrophysical Journal, Supplement Series

SN - 0067-0049

IS - 2

M1 - 14

ER -