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dc.date.accessioned | 2020-05-28T12:21:01Z | |
dc.date.available | 2020-05-28T12:21:01Z | |
dc.date.issued | 2018-04 | |
dc.identifier.uri | http://sedici.unlp.edu.ar/handle/10915/96867 | |
dc.description.abstract | High-velocity clouds (HVCs) are interstellar clouds of atomic hydrogen that do not follow normal Galactic rotation and have velocities of a several hundred kilometres per second. A considerable number of these clouds are falling down towards the Galactic disc. HVCs form large and massive complexes, so if they collide with the disc a great amount of energy would be released into the interstellar medium. The cloud-disc interaction produces two shocks: one propagates through the cloud and the other through the disc. The properties of these shocks depend mainly on the cloud velocity and the disc-cloud density ratio. In this work, we study the conditions necessary for these shocks to accelerate particles by diffusive shock acceleration and we study the non-thermal radiation that is produced. We analyse particle acceleration in both the cloud and disc shocks. Solving a time-dependent two-dimensional transport equation for both relativistic electrons and protons, we obtain particle distributions and non-thermal spectral energy distributions. In a shocked cloud, significant synchrotron radio emission is produced along with soft gamma rays. In the case of acceleration in the shocked disc, the non-thermal radiation is stronger; the gamma rays, of leptonic origin, might be detectable with current instruments. A large number of protons are injected into the Galactic interstellar medium, and locally exceed the cosmic ray background. We conclude that under adequate conditions the contribution from HVC-disc collisions to the galactic population of relativistic particles and the associated extended non-thermal radiation might be important. | en |
dc.format.extent | 4298-4308 | es |
dc.language | en | es |
dc.subject | (ISM:) cosmic rays | es |
dc.subject | ISM: clouds | es |
dc.subject | Radiation mechanisms: non-thermal | es |
dc.title | High-energy radiation from collisions of high-velocity clouds and the Galactic disc | en |
dc.type | Articulo | es |
sedici.identifier.uri | https://ri.conicet.gov.ar/11336/82423 | es |
sedici.identifier.uri | https://academic.oup.com/mnras/article-abstract/475/4/4298/4876037 | es |
sedici.identifier.other | https://doi.org/10.1093/mnras/stx2984 | es |
sedici.identifier.other | hdl:11336/82423 | es |
sedici.identifier.issn | 0035-8711 | es |
sedici.creator.person | Valle, María Victoria del | es |
sedici.creator.person | Müller, A. L. | es |
sedici.creator.person | Romero, Gustavo Esteban | es |
sedici.subject.materias | Ciencias Astronómicas | es |
sedici.description.fulltext | true | es |
mods.originInfo.place | Facultad de Ciencias Astronómicas y Geofísicas | es |
sedici.subtype | Articulo | es |
sedici.rights.license | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
sedici.rights.uri | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
sedici.description.peerReview | peer-review | es |
sedici.relation.journalTitle | Monthly Notices of the Royal Astronomical Society | es |
sedici.relation.journalVolumeAndIssue | vol. 475, no. 4 | es |