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A radio survey of Galactic center clouds

Published online by Cambridge University Press:  22 May 2014

E. A. C. Mills ,
C. C. Lang ,
M. R. Morris ,
J. Ott ,
N. Butterfield ,
D. Ludovici ,
S. Schmitz  and
A. Schmiedeke
E. A. C. Mills
Affiliation:
National Radio Astronomy Observatory, USA (email: [email protected])
C. C. Lang
Affiliation:
Dept. of Physics & Astronomy, University of Iowa, USA
M. R. Morris
Affiliation:
Dept. of Physics & Astronomy, University of California-Los Angeles, USA
J. Ott
Affiliation:
National Radio Astronomy Observatory, USA (email: [email protected])
N. Butterfield
Affiliation:
Dept. of Physics & Astronomy, University of Iowa, USA
D. Ludovici
Affiliation:
Dept. of Physics & Astronomy, University of Iowa, USA
S. Schmitz
Affiliation:
Dept. of Physics & Astronomy, University of Iowa, USA
A. Schmiedeke
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Germany
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Abstract

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We present a radio survey of molecules in a sample of Galactic center molecular clouds, including M0.25 + 0.01, the clouds near Sgr A, and Sgr B2. The molecules detected are primarily NH3 and HC3N; in Sgr B2-N we also detect non-metastable NH3, vibrationally-excited HC3N, torsionally-excited CH3OH, and numerous isotopologues of these species. 36 GHz Class I CH3OH masers are ubiquitous in these fields, and in several cases are associated with new NH3 (3,3) maser candidates. We also find that NH3 and HC3N are depleted or absent toward several of the highest dust column density peaks identified in submillimeter observations, which are associated with water masers and are thus likely in the early stages of star formation.

Keywords

Galaxy: center — molecular data — radio lines: ISM — techniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 139 - 143
Copyright
Copyright © International Astronomical Union 2014 

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