Accurate Recovery of H i Velocity Dispersion from Radio Interferometers

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dc.contributor.authorIanjamasimanana, R
dc.contributor.authorBlok, W J G de
dc.contributor.authorHeald, George H
dc.date.accessioned2021-10-08T07:20:34Z
dc.date.available2021-10-08T07:20:34Z
dc.date.issued2017
dc.description.abstractGas velocity dispersion measures the amount of disordered motion of a rotating disk. Accurate estimates of this parameter are of the utmost importance because the parameter is directly linked to disk stability and star formation. A global measure of the gas velocity dispersion can be inferred from the width of the atomic hydrogen (H I) 21 cm line. We explore how several systematic effects involved in the production of H I cubes affect the estimate of H I velocity dispersion. We do so by comparing the H I velocity dispersion derived from different types of data cubes provided by The H I Nearby Galaxy Survey. We find that residual-scaled cubes best recover the H I velocity dispersion, independent of the weighting scheme used and for a large range of signal-to-noise ratio. For H I observations, where the dirty beam is substantially different from a Gaussian, the velocity dispersion values are overestimated unless the cubes are cleaned close to (e.g., ˜1.5 times) the noise level.
dc.identifier.apacitationIanjamasimanana, R., Blok, W. J. G. d., & Heald, G. H. (2017). Accurate Recovery of H i Velocity Dispersion from Radio Interferometers. <i>The Astronomical Journal</i>, 153(5), 213 - 177. http://hdl.handle.net/11427/34956en_ZA
dc.identifier.chicagocitationIanjamasimanana, R, W J G de Blok, and George H Heald "Accurate Recovery of H i Velocity Dispersion from Radio Interferometers." <i>The Astronomical Journal</i> 153, 5. (2017): 213 - 177. http://hdl.handle.net/11427/34956en_ZA
dc.identifier.citationIanjamasimanana, R., Blok, W.J.G.d. & Heald, G.H. 2017. Accurate Recovery of H i Velocity Dispersion from Radio Interferometers. <i>The Astronomical Journal.</i> 153(5):213 - 177. http://hdl.handle.net/11427/34956en_ZA
dc.identifier.issn0004-6256
dc.identifier.issn1538-3881
dc.identifier.ris TY - Journal Article AU - Ianjamasimanana, R AU - Blok, W J G de AU - Heald, George H AB - Gas velocity dispersion measures the amount of disordered motion of a rotating disk. Accurate estimates of this parameter are of the utmost importance because the parameter is directly linked to disk stability and star formation. A global measure of the gas velocity dispersion can be inferred from the width of the atomic hydrogen (H I) 21 cm line. We explore how several systematic effects involved in the production of H I cubes affect the estimate of H I velocity dispersion. We do so by comparing the H I velocity dispersion derived from different types of data cubes provided by The H I Nearby Galaxy Survey. We find that residual-scaled cubes best recover the H I velocity dispersion, independent of the weighting scheme used and for a large range of signal-to-noise ratio. For H I observations, where the dirty beam is substantially different from a Gaussian, the velocity dispersion values are overestimated unless the cubes are cleaned close to (e.g., ˜1.5 times) the noise level. DA - 2017 DB - OpenUCT DP - University of Cape Town IS - 5 J1 - The Astronomical Journal LK - https://open.uct.ac.za PY - 2017 SM - 0004-6256 SM - 1538-3881 T1 - Accurate Recovery of H i Velocity Dispersion from Radio Interferometers TI - Accurate Recovery of H i Velocity Dispersion from Radio Interferometers UR - http://hdl.handle.net/11427/34956 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34956
dc.identifier.vancouvercitationIanjamasimanana R, Blok WJGd, Heald GH. Accurate Recovery of H i Velocity Dispersion from Radio Interferometers. The Astronomical Journal. 2017;153(5):213 - 177. http://hdl.handle.net/11427/34956.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceThe Astronomical Journal
dc.source.journalissue5
dc.source.journalvolume153
dc.source.pagination213 - 177
dc.source.urihttps://dx.doi.org/10.3847/1538-3881/aa6717
dc.subject.otherSpeed
dc.subject.otherdispersion
dc.subject.otherDispersion
dc.subject.othergas
dc.subject.otherGas
dc.subject.otherdisque
dc.subject.otherparameter
dc.subject.otherguérison
dc.subject.otherRadio interferometers
dc.subject.otherWeights and measures
dc.subject.otherMotion
dc.subject.otherEstimates
dc.subject.otherStability
dc.subject.otherAtomic hydrogen
dc.subject.otherline
dc.subject.otherproduction
dc.subject.otherprospection
dc.subject.othersurvey
dc.subject.otherObservations
dc.subject.otherValues
dc.subject.othernoise level
dc.subject.othergalaxies: fundamental parameters
dc.subject.othergalaxies: ISM
dc.subject.otherISM: kinematics and dynamics
dc.subject.otherline: profiles
dc.subject.othermethods: data analysis
dc.subject.otherTHINGS
dc.subject.otherHYDROGEN
dc.subject.otherDWARF GALAXIES
dc.subject.otherSTAR-FORMATION
dc.titleAccurate Recovery of H i Velocity Dispersion from Radio Interferometers
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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