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A Galactic Plane Survey in the CO (2-1) Line with the 60 cm Telescopes to Address Physical Condition of the Interstellar Matter

Published online by Cambridge University Press:  26 May 2016

T. Handa ,
T. Hasegawa ,
J.I. Morino ,
T. Sawada ,
S. Sakamoto ,
K.S. Usuda ,
A. Luna ,
L. Bronfman  and
M. Hayashi
T. Handa
Affiliation:
1 University of Tokyo, Mitaka, Tokyo 181—8588, Japan
T. Hasegawa
Affiliation:
1 University of Tokyo, Mitaka, Tokyo 181—8588, Japan
J.I. Morino
Affiliation:
1 University of Tokyo, Mitaka, Tokyo 181—8588, Japan
T. Sawada
Affiliation:
1 University of Tokyo, Mitaka, Tokyo 181—8588, Japan
S. Sakamoto
Affiliation:
2Nobeyama Radio Observatory, Japan
K.S. Usuda
Affiliation:
3National Astronomical Observatory, Japan
A. Luna
Affiliation:
4National Institute of Astrophysics, Optics and Electronics, Mexico
L. Bronfman
Affiliation:
5 University of Chile, Chile
M. Hayashi
Affiliation:
2Nobeyama Radio Observatory, Japan

Abstract

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To address its temperature and density we made observations of the galactic plane in CO (2-1) line with VST1 and VST2. Using a kinetic model we estimate the volume emissivities and the line intensity ratio as a function of galactocentric radius. Using data in the first and 4th quadrants separately we got shallow gradient in the both quadrants; at the smaller radius is the higher in ratio. The gradient is contributed by less bright pixels in the l-v diagram, suggesting molecular gas in interarm is different along the galactocentric radius but in arm is not.

Type
Part 6: Spectral Studies of our Galaxy
Information
Symposium - International Astronomical Union , Volume 199: The Universe at Low Radio Frequencies , 2002 , pp. 339 - 340
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

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