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Molecular gas in the immediate vicinity of Sgr A* seen with ALMA

Published online by Cambridge University Press:  09 February 2017

Lydia Moser ,
Álvaro Sánchez-Monge ,
Andreas Eckart ,
Miguel A. Requena-Torres ,
Macarena García-Marin ,
Devaky Kunneriath ,
Anton Zensus ,
Silke Britzen ,
Nadeen Sabha  and
Banafsheh Shahzamanian
...Show all authors
Lydia Moser
Affiliation:
Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany — email: [email protected] I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Álvaro Sánchez-Monge
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
Andreas Eckart
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Miguel A. Requena-Torres
Affiliation:
Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, 21218 MD, USA
Macarena García-Marin
Affiliation:
European Space Agency, 3700 San Martin Drive, Baltimore, 21218 MD, USA
Devaky Kunneriath
Affiliation:
National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville 22903, USA
Anton Zensus
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Silke Britzen
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Nadeen Sabha
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany
Banafsheh Shahzamanian
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Abhijeet Borkar
Affiliation:
I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany Astronomical Institute, Academy of Sciences, Boční II 1401, CZ-14131 Prague, Czech Republic
Sebastian Fischer
Affiliation:
German Aerospace Center (DLR), Königswinterer Str. 522-524, 53227 Bonn, Germany
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Abstract

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We report serendipitous detections of line emission with ALMA in band 3, 6, and 7 in the central parsec of the Galactic center at an up to now highest resolution (<0.7″). Among the highlights are the very first and highly resolved images of sub-mm molecular emission of CS, H13CO+, HC3N, SiO, SO, C2H, and CH3OH in the immediate vicinity (~1″ in projection) of Sgr A* and in the circumnuclear disk (CND). The central association (CA) of molecular clouds shows three times higher CS/X (X: any other observed molecule) luminosity ratios than the CND suggesting a combination of higher excitation - by a temperature gradient and/or IR-pumping - and abundance enhancement due to UV- and/or X-ray emission. We conclude that the CA is closer to the center than the CND is and could be an infalling clump consisting of denser cloud cores embedded in diffuse gas. Moreover, we identified further regions in and outside the CND that are ideally suited for future studies in the scope of hot/cold core and extreme PDR/XDR chemistry and consequent star formation in the central few parsecs.

Keywords

Galaxy: centerGalaxy: nucleusSubmillimeter: ISMISM: moleculesISM: cloudsISM: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S322: The Multi-Messenger Astrophysics of the Galactic Centre , July 2016 , pp. 129 - 132
Copyright
Copyright © International Astronomical Union 2017 

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