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All quiet on the Western front? New evidence for massive star formation in Sgr C

Published online by Cambridge University Press:  22 May 2014

Sarah Kendrew ,
Adam Ginsburg ,
Katharine Johnston ,
Henrik Beuther ,
John Bally ,
Claudia J. Cyganowski  and
Cara Battersby
Sarah Kendrew
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany Sub-Dept of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, United Kingdom
Adam Ginsburg
Affiliation:
CASA, University of Colorado at Boulder, UCB 389, Boulder, CO 80309, USA
Katharine Johnston
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
Henrik Beuther
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
John Bally
Affiliation:
CASA, University of Colorado at Boulder, UCB 389, Boulder, CO 80309, USA
Claudia J. Cyganowski
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA
Cara Battersby
Affiliation:
CASA, University of Colorado at Boulder, UCB 389, Boulder, CO 80309, USA
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Abstract

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We summarize here our recent findings from near-infrared spectroscopy and 1 mm line and continuum observations of a recently identified extended green object (EGO) in Sgr C, whose observational characteristics suggest early-stage massive star formation is taking place. Located on the outskirts of the massive evolved Hii region associated with Sgr C in the Western central molecular zone (CMZ), the EGO measures ∼10″ (0.4 pc at 8.5 kpc). We confirm that early-stage star formation is taking place on the periphery of the Sgr C Hii region. The data show clear detections of two protostellar cores and several knots of H2 and Brackett γ emission alongside a previously detected compact radio source. We calculate the cores' joint mass to be ∼103 M⊙, with column densities of 1-2 × 1024 cm−2. The host molecular clouds mass is approximately 105 M⊙. Despite these favorable conditions, the cloud is curiously devoid of any further star formation, making it comparable to other remarkably quiescent clouds, such as G0.253 in the Eastern CMZ.

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. 220 - 222
Copyright
Copyright © International Astronomical Union 2014 

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