2026-06-27T15:15:48Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/340142025-08-08T14:37:35Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Nichols, Matthew
author
Mirabal Barrios, Néstor
author
Agertz, Oscar
author
Lockman, Felix J.
author
Bland-Hawthorn, Joss
2023-06-19T13:33:33Z
2023-06-19T13:33:33Z
2014
0035-8711
10.1093/mnras/stu1028
https://hdl.handle.net/20.500.14352/34014
http://mnras.oxfordjournals.org/content/442/4/2883.full.pdf+html
http://mnras.oxfordjournals.org
Under conservative assumptions about the Galaxy, the derived velocity of the Smith Cloud indicates that it will have undergone at least one passage of the Galactic disc. Using hydrodynamic simulations, we examine the present-day structure of the Smith Cloud and find that a dark matter supported cloud is able to reproduce the observed present-day neutral hydrogen mass, column density distribution and morphology. In this case, the dark matter halo becomes elongated owing to the tidal interaction with the Galactic disc. Clouds in models neglecting dark matter confinement are destroyed upon disc passage, unless the initial cloud mass is well in excess of what is observed today. We then determine integrated flux upper limits to the gamma-ray emission around such a hypothesized dark matter core in the Smith Cloud. No statistically significant core or extended gamma-ray emission are detected down to a 95 per cent confidence level upper limit of 1.4 x 10(-10) ph cm(-2) s(-1) in the 1-300 GeV energy range. For the derived distance of 12.4 kpc, the Fermi upper limits set the first tentative constraints on the dark matter cross-sections annihilating into tau(+)tau(-) and b (b) over bar for a high-velocity cloud.
eng
The Smith Cloud and its dark matter halo: survival of a Galactic disc passage
journal article
URL
https://docta.ucm.es/bitstreams/1b407db5-5528-4db1-94aa-b28d78376687/download
File
MD5
5e109b9e48b863e9756b2a2b662c7eda
3336970
application/pdf
Art. 210.pdf