High resolution survey of molecular clouds in and between the Galactic spiral arms

Details High resolution survey of molecular clouds in and between the Galactic spiral arms High resolution survey of molecular clouds in and between the Galactic spiral arms

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..317...88s&link_type=abstract

Milky Way Surveys: The Structure and Evolution of our Galaxy, Proceedings of ASP Conference #317. The 5th Boston University Ast

Astronomy and Astrophysics

Astrophysics

Scientific paper

We are carrying out 13CO J=1-0 survey observations of Sagittarius arm region (ℓ=38°) to investigate relations between the dynamics of the Galaxy and the properties of molecular clouds. The survey is on-going, and we have already mapped a 20' × 30' (31 × 44 pc at 5 kpc) region. The arm components have clumpy structures. To the contrary, the inter-arm component shows clump-less structure and is distributed broadly. We investigate the correlation between the line width Δ VFWHM and the size R in each region. There are differences in the size-line width relation of clumps among these three components, i.e. the size of clumps in the near arm is smaller than that in the far arm and inter-arm. The majority of clumps is distributed above MVIR/MLTE=1 in all regions. If clumps with MVIR/MLTE>1 are externally bound, Averages of external pressure for the near arm, far arm, and inter-arm regions are 2.4 × 105, 0.6 × 105, and 1.0 × 105 K cm-3, respectively. Clump-mass spectra have the same tendency of a probability density function (pdf) in the observed region. The slope of clump-mass spectrum in the inter-arm region is steeper than that in the arm.

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