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Hydroxyl, water, ammonia, carbon monoxide and neutral carbon towards the Sgr A complex
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Astronomy.
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2013 (English)In: Proceedings of the International Astronomical Union, ISSN 1743-9213, E-ISSN 1743-9221, Vol. 9, no S303, p. 97-99Article in journal (Other academic) Published
Abstract [en]

We observed Hydroxyl, water, ammonia, carbon monoxide and neutral carbon towards the +50 km s−1 cloud (M−0.02−0.07), the circumnuclear disk (CND) and the +20 km s−1 (M−0.13−0.08) cloud in the Sgr A complex with the VLA, Odin and SEST. Strong OH absorption, H2O emission and absorption lines were seen at all three positions. Strong C18O emissions were seen towards the +50 and +20 km s−1 clouds. The CND is rich in H2O and OH, and these abundances are considerably higher than in the surrounding clouds, indicating that shocks, star formation and clump collisions prevail in those objects. A comparison with the literature reveals that it is likely that PDR chemistry including grain surface reactions, and perhaps also the influences of shocks has led to the observed abundances of the observed molecular species studied here. In the redward high-velocity line wings of both the +50 and +20 km s−1 clouds and the CND, the very high H2O abundances are suggested to be caused by the combined action of shock desorption from icy grain mantles and high-temperature, gas-phase shock chemistry. Only three of the molecules are briefly discussed here. For OH and H2O three of the nine observed positions are shown, while a map of the C18O emission is provided. An extensive paper was recently published with Open Access (Karlsson et al. 2013, A&A 554, A141).

Place, publisher, year, edition, pages
2013. Vol. 9, no S303, p. 97-99
Keywords [en]
Sgr A, +50, +20 km s−1clouds, CND, OH, H2O abundances, gas-phase chemistry
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Astronomy
Identifiers
URN: urn:nbn:se:su:diva-122688DOI: 10.1017/S174392131400026XOAI: oai:DiVA.org:su-122688DiVA, id: diva2:868116
Conference
International Astronomical Union Symposium 303, September 30 - October 4, Santa Fe New Mexico (USA), 2013
Available from: 2015-11-09 Created: 2015-11-09 Last updated: 2019-04-23Bibliographically approved

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