MeerKAT-16 HI observation of the dIrr galaxy WLM

dc.contributor.authorIanjamasimanana, Roger
dc.contributor.authorNamumba, Brenda
dc.contributor.authorRamaila, Athanaseus J.T.
dc.contributor.authorSaburova, Anna S.
dc.contributor.authorJozsa, Gyula I.G.
dc.contributor.authorMyburgh, Talon
dc.contributor.authorThorat, Kshitij
dc.contributor.authorCarignan, Claude
dc.contributor.authorMaina, Eric
dc.contributor.authorDe Blok, W.J.G.
dc.contributor.authorAndati, Lexy A.L.
dc.contributor.authorHugo, Benjamin V.
dc.contributor.authorKleiner, Dane
dc.contributor.authorKamphuis, Peter
dc.contributor.authorSerra, Paolo
dc.contributor.authorSmirnov, Oleg M.
dc.contributor.authorMaccagni, Filippo M.
dc.contributor.authorMakhathini, Sphesihle
dc.contributor.authorMolnar, Daniel Cs.
dc.contributor.authorPerkins, Simon
dc.contributor.authorRamatsoku, Mpati
dc.contributor.authorWhite, Sarah V.
dc.date.accessioned2021-07-01T10:01:08Z
dc.date.available2021-07-01T10:01:08Z
dc.date.issued2020-10
dc.description.abstractWe present observations and models of the kinematics and the distribution of the neutral hydrogen (Hi) in the isolated dwarf irregular galaxy, Wolf-Lundmark-Melotte (WLM). We observed WLM with the Green Bank Telescope (GBT) and as part of the MeerKAT Early Science Programme, where 16 dishes were available. The Hi disc of WLM extends out to a major axis diameter of 300 (8.5 kpc), and a minor axis diameter of 200 (5.6 kpc) as measured by the GBT. We use the MeerKAT data to model WLM using the TiRiFiC software suite, allowing us to t di erent tilted-ring models and select the one that best matches the observation. Our nal best- tting model is a at disc with a vertical thickness, a constant inclination and dispersion, and a radially-varying surface brightness with harmonic distortions. To simulate bar- like motions, we include second-order harmonic distortions in velocity in the tangential and the vertical directions. We present a model with only circular motions included and a model with non-circular motions. The latter describes the data better. Overall, the models reproduce the global distribution and the kinematics of the gas, except for some faint emission at the 2 level. We model the mass distribution of WLM with a pseudo-isothermal (ISO) and a Navarro-Frenk-White (NFW) dark matter halo models. The NFW and the ISO models t the derived rotation curves within the formal errors, but with the ISO model giving better reduced chi-square values. The mass distribution in WLM is dominated by dark matter at all radii.en_ZA
dc.description.departmentPhysicsen_ZA
dc.description.librarianam2021en_ZA
dc.description.sponsorshipThe MeerKAT telescope is operated by the South African Radio Astronomy Observatory, which is a facility of the Na- tional Research Foundation, an agency of the Department of Science and Innovation. This work is based upon research supported by the South African Research Chairs Initiative of the Department of Sci- ence and Technology and National Research Foundation. The nancial assistance of the South African Radio Astron- omy Observatory (SARAO) towards this research is hereby acknowledged (www.sarao.ac.za). PK is partially supported by the BMBF project 05A17PC2 for D-MeerKAT. AS acknowledges the Russian Science Foundation grant 19-12-00281 and the Program of development of M.V.en_ZA
dc.description.urihttp://mnras.oxfordjournals.orgen_ZA
dc.identifier.citationIanjamasimanana, R, Nmumba, B & Ramaila, AJT 2020, 'MeerKAT-16 HI observation of the dIrr galaxy WLM', Monthly Notices of the Royal Astronomical Society, vol. 497, no. 4, pp. 1-20.en_ZA
dc.identifier.issn0035-8711 (print)
dc.identifier.issn1365-2966 (online)
dc.identifier.urihttp://hdl.handle.net/2263/80675
dc.language.isoenen_ZA
dc.publisherOxford University Pressen_ZA
dc.rights© 2020 The Authors. This work is distributed under the Creative Commons Attribution License.en_ZA
dc.subjectInstrumentation: interferometersen_ZA
dc.subjectMethods: data analysisen_ZA
dc.subjectGalaxies: dwarfen_ZA
dc.subjectMeerKAT radio telescope
dc.titleMeerKAT-16 HI observation of the dIrr galaxy WLMen_ZA
dc.typeArticleen_ZA

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