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A 100 pc Elliptical and Twisted Ring of Cold and Dense Molecular Clouds Revealed by Herschel Around the Galactic Center

Molinari, S. and Noriega-Crespo, A. and Compiegne, M. and Carey, S. and Lord, S. D. (2011) A 100 pc Elliptical and Twisted Ring of Cold and Dense Molecular Clouds Revealed by Herschel Around the Galactic Center. Astrophysical Journal Letters, 735 (2). Art. No. L33. ISSN 2041-8205. https://resolver.caltech.edu/CaltechAUTHORS:20110816-073245864

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Abstract

Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on board the Herschel satellite, reveal a ~3 × 10^7 M_☉ ring of dense and cold clouds orbiting the Galactic center. Using a simple toy model, an elliptical shape having semi-major axes of 100 and 60 pc is deduced. The major axis of this 100 pc ring is inclined by about 40° with respect to the plane of the sky and is oriented perpendicular to the major axes of the Galactic Bar. The 100 pc ring appears to trace the system of stable x_2 orbits predicted for the barred Galactic potential. Sgr A⋆ is displaced with respect to the geometrical center of symmetry of the ring. The ring is twisted and its morphology suggests a flattening ratio of 2 for the Galactic potential, which is in good agreement with the bulge flattening ratio derived from the 2MASS data.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/2041-8205/735/2/L33 DOIArticle
http://iopscience.iop.org/2041-8205/735/2/L33PublisherArticle
https://arxiv.org/abs/1105.5486arXivDiscussion Paper
ORCID:
AuthorORCID
Carey, S.0000-0002-0221-6871
Alternate Title:A 100-parsec elliptical and twisted ring of cold and dense molecular clouds revealed by Herschel around the Galactic Center
Additional Information:© 2011 The American Astronomical Society. Received 2011 February 14; accepted 2011 May 17; published 2011 June 21. Data processing and map production have been possible thanks to ASI support via contract I/038/080/0. We thank the referee M.Morris for useful comments that led to a more focused paper. We thank L. Spinoglio, N. Sacchi, and A. Marconi for useful discussions on AGNs. We also thank M. Pohlen and the SPIRE ICC for the preliminary analysis on the SPIRE “brightsource mode” calibration.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Agenzia Spaziale Italiana (ASI)I/038/080/0
Subject Keywords:Galaxy: center; ISM: clouds; stars: formation
Issue or Number:2
Classification Code:PACS: 95.85.Hp; 98.35.Jk; 98.38.Jw; 98.38.Dq
Record Number:CaltechAUTHORS:20110816-073245864
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110816-073245864
Official Citation:A 100 pc Elliptical and Twisted Ring of Cold and Dense Molecular Clouds Revealed by Herschel Around the Galactic Center S. Molinari et al. 2011 ApJ 735 L33
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24872
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:16 Aug 2011 14:57
Last Modified:03 Oct 2019 03:00

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