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LITTLE THINGS in 3D: robust determination of the circular velocity of dwarf irregular galaxies

Iorio, Giuliano; Fraternali, F; Nipoti, C; Di Teodoro, Enrico Maria; Read, J I; Battaglia, G

Description

Dwarf irregular galaxies (dIrrs) are the smallest stellar systems with extended H i discs. The study of the kinematics of such discs is a powerful tool to estimate the total matter distribution at these very small scales. In this work, we study the H i kinematics of 17 galaxies extracted from the 'Local Irregulars That Trace Luminosity Extremes, The H i Nearby Galaxy Survey' (LITTLE THINGS). Our approach differs significantly from previous studies in that we directly fit 3D models (two spatial...[Show more]

dc.contributor.authorIorio, Giuliano
dc.contributor.authorFraternali, F
dc.contributor.authorNipoti, C
dc.contributor.authorDi Teodoro, Enrico Maria
dc.contributor.authorRead, J I
dc.contributor.authorBattaglia, G
dc.date.accessioned2021-08-02T01:07:49Z
dc.date.available2021-08-02T01:07:49Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/242580
dc.description.abstractDwarf irregular galaxies (dIrrs) are the smallest stellar systems with extended H i discs. The study of the kinematics of such discs is a powerful tool to estimate the total matter distribution at these very small scales. In this work, we study the H i kinematics of 17 galaxies extracted from the 'Local Irregulars That Trace Luminosity Extremes, The H i Nearby Galaxy Survey' (LITTLE THINGS). Our approach differs significantly from previous studies in that we directly fit 3D models (two spatial dimensions plus one spectral dimension) using the software 3Dbarolo, fully exploiting the information in the H i data cubes. For each galaxy, we derive the geometric parameters of the H i disc (inclination and position angle), the radial distribution of the surface density, the velocity-dispersion (σv) profile and the rotation curve. The circular velocity (Vc), which traces directly the galactic potential, is then obtained by correcting the rotation curve for the asymmetric drift. As an initial application, we show that these dIrrs lie on a baryonic Tully-Fisher relation in excellent agreement with that seen on larger scales. The final products of this work are high-quality, ready-to-use kinematic data (Vc and σv) that we make publicly available. These can be used to perform dynamical studies and improve our understanding of these low-mass galaxies.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherRoyal Astronomical Society
dc.rights© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society Downloaded from https://academic.oup.com/mnras/article-abstract/466/4/4159/2712521/LITTL
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: ISM
dc.subjectgalaxies: kinematics and dynamics
dc.subjectgalaxies: structure
dc.titleLITTLE THINGS in 3D: robust determination of the circular velocity of dwarf irregular galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume466
dc.date.issued2017
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu5227626xPUB23
local.publisher.urlhttp://mnras.oxfordjournals.org/
local.type.statusPublished Version
local.contributor.affiliationIorio, Giuliano, Dipartimento di Fisica e Astronomia, Universita di Bologna
local.contributor.affiliationFraternali, F, University of Bologna
local.contributor.affiliationNipoti, C, Dipartimento di Fisica e Astronomia, Universita di Bologna
local.contributor.affiliationDi Teodoro, Enrico, College of Science, ANU
local.contributor.affiliationRead, J I, University of Surrey
local.contributor.affiliationBattaglia, G, nstituto de Astrofisica de Canarias
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage4159
local.bibliographicCitation.lastpage4192
local.identifier.doi10.1093/mnras/stw3285
dc.date.updated2020-11-23T10:45:50Z
local.identifier.scopusID2-s2.0-85014914334
local.identifier.thomsonID000402849400028
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/24618..."The Published Version can be archived in Institutional Repository" from SHERPA/RoMEO site (as at 2/08/2021).
CollectionsANU Research Publications

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