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Odin observations of ammonia in the SgrA+50 km s(-1) cloud and circumnuclear disk
Stockholm University, Faculty of Science, Department of Astronomy.
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Number of Authors: 7
2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 599, A135Article in journal (Refereed) Published
Abstract [en]

Context. The Odin satellite is now into its sixteenth year of operation, much surpassing its design life of two years. One of the sources which Odin has observed in great detail is the Sgr A complex in the centre of the Milky Way.

Aims. To study the presence of NH3 in the Galactic centre and spiral arms.

Methods. Recently, Odin has made complementary observations of the 572 GHz NH3 line towards the SgrA + 50 km s(-1) cloud and circumnuclear disk (CND).

Results. Significant NH3 emission has been observed in both the + 50 km s(-1) cloud and the CND. Clear NH3 absorption has also been detected in many of the spiral arm features along the line of sight from the Sun to the core of our Galaxy.

Conclusions. The very large velocity width (80 km s 1) of the NH3 emission associated with the shock region in the southwestern part of the CND may suggest a formation / desorption scenario similar to that of gas-phase H2O in shocks / outflows.

Place, publisher, year, edition, pages
2017. Vol. 599, A135
Keyword [en]
Galaxy: center, ISM: individual objects: Sgr A, ISM: molecules, ISM: clouds
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-148922DOI: 10.1051/0004-6361/201629954ISI: 000413691400015OAI: oai:DiVA.org:su-148922DiVA: diva2:1156590
Available from: 2017-11-13 Created: 2017-11-13 Last updated: 2017-11-13Bibliographically approved

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