The chemistry and kinematics of two molecular clouds near Sagittarius A*
Author
dc.contributor.author
López, John
Author
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Cunningham, María
Author
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Jones, Paul
Author
dc.contributor.author
Marshall, Jonathan
Author
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Bronfman Aguiló, Leonardo
Author
dc.contributor.author
Lo, Nadia
Author
dc.contributor.author
Walsh, Andrew
Admission date
dc.date.accessioned
2017-11-29T20:24:33Z
Available date
dc.date.available
2017-11-29T20:24:33Z
Publication date
dc.date.issued
2016
Cita de ítem
dc.identifier.citation
MNRAS 463, 1363–1389 (2016)
es_ES
Identifier
dc.identifier.issn
0035-8711
Identifier
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10.1093/mnras/stw1975
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/145927
Abstract
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We have analysed the chemical and kinematic properties of the 20 and 50 km s(-1) molecular clouds in the Central Molecular Zone of the Milky Way Galaxy, as well as those of the molecular ridge bridging these two clouds. Our work has utilized 37 molecular transitions in the 0.65, 3 and 7-mm wavebands, from the Mopra and NANTEN2 telescopes. The 0.65-mm NANTEN2 data highlights a dense condensation of emission within the western part of the 20 km s(-1) cloud, visible in only four other transitions, which are 3-mm (HCN)-C-13 (1-0), (HCO+)-C-13 (1-0), HNC (1-0) and N2H+ (1-0), suggesting that the condensation is moderately optically thick and cold. We find that while the relative chemical abundances between both clouds are alike in many transitions, suggesting little variation in the chemistry between both clouds; the 20 km s(-1), cold cloud is brighter than the 50 km s(-1) cloud in shock and high density tracers. The spatial distribution of enhanced emission is widespread in the 20 km s(-1) cloud, as shown via line ratio maps. The position velocity diagrams across both clouds indicate that the gas is well mixed. We show that the molecular ridge is most likely part of the 20 km s(-1) cloud and that both of them may possibly extend to include the 50 km s(-1) cloud, as part of one larger cloud. Furthermore, we expect that the 20 km s(-1) cloud is being tidally sheared as a result of the gravitational potential from Sgr A*
es_ES
Patrocinador
dc.description.sponsorship
UNSW Vice-Chancellor's Postdoctoral Research Fellowship
CONICYT PFB-06 1120195
CONICYT/FONDECYT post-doctorado 3130540
Commonwealth of Australia
Australian Research Council (ARC)
UNSW, Sydney
Monash Universities
CSIRO