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AMANOGAWA-2SB survey: a northern galactic plane survey in 12CO (J = 2 − 1) and 13CO (J = 2 − 1) with the Amanogawa telescope

Published online by Cambridge University Press:  21 March 2013

Toshihiro Handa
Affiliation:
Depart. Astron. & Phys., Kagoshima Univ., Korimoto 1-21-35, Kagoshima 890-0065, Japan; email: handa@sci.kagoshima-u.ac.jp
Takahiro Yoda
Affiliation:
Yamanashi Gakuin highschool
Kotaro Kohno
Affiliation:
University of Tokyo
Taku Nakajima
Affiliation:
National Astronomical Observatory of Japan
Jun-ichi Morino
Affiliation:
National Astronomical Observatory of Japan
Yoshinori Yonekura
Affiliation:
Ibaraki University
Hideo Ogawa
Affiliation:
Osaka Prefecture University
Kimihiro Kimura
Affiliation:
Osaka Prefecture University
Kazuhiro Dobashi
Affiliation:
Tokyo Gakugei University
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Abstract

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We performed 12CO(J = 2 − 1) and 13CO(J = 2 − 1) line surveys of the galactic plane using the AMANOGAWA telescope (Nakajima et al. 2007) which covers 5° ≤ l ≤ 180° on a 7'.5 grid. The telescope beamsize and velocity resolution are 8.7′ ± 0.4′ and 1.3 km s−1. The resultant rms noise level is typically 0.12 K in TA*. We found a linear correlation between 12CO(J = 2 − 1) and 12CO(J = 1 − 0) and a curved correlation between 12CO(J = 2 − 1) and 13CO (J = 2 − 1), although the intensity ratios of these three lines have intrinsic variation. These correlations can be reproduced with simple radiative transfer equations suggesting some restrictions on the physical quantities of molecular gas on a galactic scale.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013

References

Dame, T. M., Hartmann, D., & Thaddeus, P. 2001, ApJ, 547, 792Google Scholar
Nakajima, T., et al. 2007, PASJ, 59, 1005Google Scholar
Yoda, T., et al. 2010, PASJ, 62, 1277Google Scholar