Dense Molecular Clouds in the Galactic Center Region. I. Observations and Data

Details Dense Molecular Clouds in the Galactic Center Region. I. Observations and Data Dense Molecular Clouds in the Galactic Center Region. I. Observations and Data

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apjs..120....1t&link_type=abstract

The Astrophysical Journal Supplement Series, Volume 120, Issue 1, pp. 1-39.

Astronomy and Astrophysics

Astronomy

107

Atlases, Galaxy: Center, Ism: Clouds, Ism: Structure

Scientific paper

We have observed a 160^'x40^' (lxb) region around the Galactic center in the CS J=1-0 line with a high spatial resolution and high sensitivity using the 45 m telescope at Nobeyama Radio Observatory. The observed area includes the Sgr A radio arc complex, Sgr B, Sgr C, and Sgr D. About 24,000 spectra of CS J=1-0 emission, which is a good tracer of high-density (n≅10^4 cm^-3) molecular clouds, were obtained. The observed data are presented in l-b, l-v, and b-v maps. The total CS line flux in this area is Sdv=1.1x10^6 Jy km s^-1. Typical optical thickness of C^32S J=1-0 emission is equal to or lower than tau=2-3. The total molecular mass in the Galactic center region is estimated to be M(H_2)=(3-8)x10^7 M_solar from the assumption of LTE. One-third of the molecular clouds in the Galactic center region are involved in several continuous curved ridges extended along the Galactic longitude. The most prominent ridge has a ``bow''-like structure with a length of 300 pc.

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