Aperture synthesis imaging of a high-velocity compact cloud near the galactic center

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

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We observed CO J = 1-0 and HCN J = 1-0 line emission toward a high-velocity, compact molecular cloud, CO 0.02-0.02, near the center of our Galaxy, using the Nobeyama Millimeter Array (NMA). A CO velocity-integrated map with a resolution of 4.″3 × 2.″4 shows two oval clumps with sizes of 0.8 pc. These clumps are seperated by 1.2 pc, being located at the eastern and southwestern peripheries of the CO 0.02-0.02 cloud. The overall distribution of HCN emission coincides with that taken with the Nobeyama 45 m telescope. The HCN velocity-integrated map with a resolution of 6.″ × 3.″4 shows two prominent peaks in the cloud center. Both NMA maps at VLSR ∼ 110km s-1 show an arc-shaped edge in the southeast, which may correspond to the edge of the "emission cavity" found in the CO J = 3-2 integrated-intesity map. We also noticed a faint radio continuum "arc" that encircles the bulk of the CO 0.02-0.02 cloud. These results support the notion that CO 0.02-0.02 has been accelerated, heated, and compressed in a series of supernova shocks that occurred within the last (3-5) × 104 yr. We suggest that a massive compact cluster with an age of 10-30 Myr is responsible for the formation of the CO 0.02-0.02 cloud.

Original languageEnglish
Pages (from-to)429-434
Number of pages6
JournalPublications of the Astronomical Society of Japan
Volume60
Issue number3
Publication statusPublished - 2008

Fingerprint

apertures
clumps
synthesis
arcs
molecular clouds
supernovae
cavity
shock
telescopes
radio
galaxies
continuums
cavities

Keywords

  • Galaxies: nuclei
  • Galaxy: center
  • ISM: clouds
  • ISM: molecules

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Oka, T., Hasegawa, T., White, G. J., Sato, F., Tsuboi, M., & Miyazaki, A. (2008). Aperture synthesis imaging of a high-velocity compact cloud near the galactic center. Publications of the Astronomical Society of Japan, 60(3), 429-434.

Aperture synthesis imaging of a high-velocity compact cloud near the galactic center. / Oka, Tomoharu; Hasegawa, Tetsuo; White, Glenn J.; Sato, Fumio; Tsuboi, Masato; Miyazaki, Atsushi.

In: Publications of the Astronomical Society of Japan, Vol. 60, No. 3, 2008, p. 429-434.

Research output: Contribution to journalArticle

Oka, T, Hasegawa, T, White, GJ, Sato, F, Tsuboi, M & Miyazaki, A 2008, 'Aperture synthesis imaging of a high-velocity compact cloud near the galactic center', Publications of the Astronomical Society of Japan, vol. 60, no. 3, pp. 429-434.
Oka, Tomoharu ; Hasegawa, Tetsuo ; White, Glenn J. ; Sato, Fumio ; Tsuboi, Masato ; Miyazaki, Atsushi. / Aperture synthesis imaging of a high-velocity compact cloud near the galactic center. In: Publications of the Astronomical Society of Japan. 2008 ; Vol. 60, No. 3. pp. 429-434.
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