Journal Article

The AMANOGAWA-2SB Galactic Plane Survey I. Data on the Galactic Equator

Takahiro Yoda, Toshihiro Handa, Kotaro Kohno, Taku Nakajima, Masahiro Kaiden, Yoshinori Yonekura, Hideo Ogawa, Jun-ichi Morino and Kazuhito Dobashi

in Publications of the Astronomical Society of Japan

Volume 62, issue 5, pages 1277-1289
Published in print October 2010 | ISSN: 0004-6264
Published online October 2010 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/62.5.1277
The AMANOGAWA-2SB Galactic Plane Survey I. Data on the Galactic Equator

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  • Astronomy and Astrophysics
  • Interstellar Medium

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Using a waveguide-type sideband-separating receiver (2SB receiver) on the Tokyo-NRO 60-cm telescope (renamed the AMANOGAWA telescope), we carried out simultaneous observations in the [math]CO ([math] 2–1) and [math]CO ([math] 2–1) lines over the galactic plane [math] 10[math]–245[math] along [math] 0[math] with a 3[math]75 grid. Using the [math]CO ([math] 1–0) data of Dame et al. (2001, ApJ, 547, 792), who used a beam size almost the same as ours, we show [math]CO ([math] 2–1)[math]CO ([math] 1–0) and [math]CO ([math] 2–1)[math]CO ([math] 2–1) intensity ratios on the [math]–[math] map and the intensity correlations among the [math]CO ([math] 2–1), [math]CO ([math] 2–1), and [math]CO ([math] 1–0) lines. As a result, a linear correlation between [math]CO ([math] 2–1) and [math]CO ([math] 1–0) and a curved correlation between [math]CO ([math] 2–1) and [math]CO ([math] 2–1), as produced by most of the data, have been found. We investigated these correlations with simple radiative transfer equations to ascertain a number of restrictions on the physical quantities of molecular gas on a galactic scale.

Keywords: Galaxy: disk; Galaxy: structure; ISM: molecules; surveys

Journal Article.  6922 words.  Illustrated.

Subjects: Galaxies ; Astronomy and Astrophysics ; Interstellar Medium

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