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Sgr A West in the light of molecules: cold and dense gas east of the circumnuclear disk

Published online by Cambridge University Press:  22 May 2014

Lydia Moser ,
A. Eckart ,
A. Borkar ,
M. García-Marin ,
D. Kunneriath ,
B. Jalali ,
N. Sabha ,
B. Shahzamanian ,
M. Valencia-S.  and
M. Zamaninasab
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Lydia Moser
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de
A. Eckart
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
A. Borkar
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
M. García-Marin
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de
D. Kunneriath
Affiliation:
Astronomical Institute of the Academy of Sciences, Bocni II 1401, CZ-141 00 Praha 4 - Sporilov, Czech Republic
B. Jalali
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de
N. Sabha
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
B. Shahzamanian
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
M. Valencia-S.
Affiliation:
Physikalisches Institut, University of Cologne, Zülpicherstr. 77, 50937 Cologne, Germany email: moser@ph1.uni-koeln.de
M. Zamaninasab
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
L. Bronfman
Affiliation:
Departemento de Astronomia, Universidad de Chile, Castilla 36-D, Santiago, Chile
R. Finger
Affiliation:
Departemento de Astronomia, Universidad de Chile, Castilla 36-D, Santiago, Chile
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Abstract

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We present the very first detection of N2H+J = (1 – 0) and CH3OH(2k−1k) line emission on 5″ scales in the circumnuclear disk (CND) around Sgr A*. The emission matches the position and shape of the dark clouds in the near-infrared. Our findings suggest that these molecular clouds in the eastern CND are significantly colder and denser than the rest of the CND, and partially shocked. The research on these dark clouds will contribute to understanding the processes of star formation close to a supermassive black hole.

Keywords

molecular dataISM: cloudsISM: moleculesGalaxy: centerGalaxy: nucleus

References

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