Magnetized High Velocity Clouds in the Galactic Halo: A New Distance Constraint
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Gronnow, Asger; Tepper-Garcia, Thor; Bland-Hawthorn, Joss; McClure-Griffiths, Naomi
Description
High velocity gas that does not conform to Galactic rotation is observed throughout the Galaxy's halo. One component of this gas, H i high velocity clouds (HVCs), have attracted attention since their discovery in the 1960s and remain controversial in terms of their origins, largely due to the lack of reliable distance estimates. The recent discovery of enhanced magnetic fields toward HVCs has encouraged us to explore their connection to cloud evolution, kinematics, and survival as they fall...[Show more]
dc.contributor.author | Gronnow, Asger | |
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dc.contributor.author | Tepper-Garcia, Thor | |
dc.contributor.author | Bland-Hawthorn, Joss | |
dc.contributor.author | McClure-Griffiths, Naomi | |
dc.date.accessioned | 2020-12-20T20:57:13Z | |
dc.date.available | 2020-12-20T20:57:13Z | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/1885/218200 | |
dc.description.abstract | High velocity gas that does not conform to Galactic rotation is observed throughout the Galaxy's halo. One component of this gas, H i high velocity clouds (HVCs), have attracted attention since their discovery in the 1960s and remain controversial in terms of their origins, largely due to the lack of reliable distance estimates. The recent discovery of enhanced magnetic fields toward HVCs has encouraged us to explore their connection to cloud evolution, kinematics, and survival as they fall through the magnetized Galactic halo. For a reasonable model of the halo magnetic field, most infalling clouds see transverse rather than radial field lines. We find that significant compression (and thereby amplification) of the ambient magnetic field occurs in front of the cloud and in the tail of material stripped from the cloud. The compressed transverse field attenuates hydrodynamical instabilities. This delays cloud destruction, though not indefinitely. The observed ${\boldsymbol{B}}$ field compression is related to the cloud's distance from the Galactic plane. As a result, the observed rotation measure provides useful distance information on a cloud's location. | |
dc.description.sponsorship | A.G. and T.T. G. acknowledge financial support from the Australian Research Council (ARC) through an Australian Laureate Fellowship awarded to J.B.H. N.M.G. acknowledges the support of the ARC through Future Fellowship FT150100024. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | IOP Publishing | |
dc.rights | © 2017 The American Astronomical Society | |
dc.source | The Astrophysical Journal | |
dc.subject | galaxies: evolution | |
dc.subject | galaxies: halos | |
dc.subject | galaxies: interactions | |
dc.subject | magnetohydrodynamics (MHD) | |
dc.subject | methods: numerical | |
dc.title | Magnetized High Velocity Clouds in the Galactic Halo: A New Distance Constraint | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 845 | |
dc.date.issued | 2017-08-11 | |
local.identifier.absfor | 020109 - Space and Solar Physics | |
local.identifier.ariespublication | a383154xPUB8373 | |
local.type.status | Accepted Version | |
local.contributor.affiliation | Gronnow, Asger, The University of Sydney | |
local.contributor.affiliation | Tepper-Garcia, Thor, University of Sydney | |
local.contributor.affiliation | Bland-Hawthorn, Joss, University of Sydney | |
local.contributor.affiliation | McClure-Griffiths, Naomi, College of Science, ANU | |
local.bibliographicCitation.issue | 1 | |
local.identifier.doi | 10.3847/1538-4357/aa7ed2 | |
dc.date.updated | 2020-11-23T10:46:50Z | |
local.identifier.scopusID | 2-s2.0-85027974114 | |
local.identifier.thomsonID | 000407462000028 | |
dcterms.accessRights | Open Access | |
dc.relation.uri | http://purl.org/au-research/grants/arc/FT150100024 | |
dc.provenance | https://v2.sherpa.ac.uk/id/publication/6401..."Author accepted manuscript can be made open access on non-commercial institutional repository after 12 month embargo" from SHERPA/RoMEO site (as at 19.11.2021). | |
Collections | ANU Research Publications |
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File | Description | Size | Format | Image |
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1707.02697.pdf | Author Accepted Manuscript | 2.61 MB | Adobe PDF |
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