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MeerKAT-16 H I observation of the dIrr galaxy WLMстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Ianjamasimanana Roger, Namumba Brenda, Ramaila Athanaseus J.T., Saburova Anna S., Józsa Gyula I.G., Myburgh Talon, Thorat Kshitij, Carignan Claude, Maina Eric, de Blok W.J.G, Andati Lexy A.L., Hugo Benjamin V., Kleiner Dane, Kamphuis Peter, Serra Paolo, Smirnov Oleg M., Maccagni Filippo M., Makhathini Sphesihle, Molnár Dániel Cs, Perkins Simon, Ramatsoku Mpati, White Sarah V.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Год издания: 2020
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- DOI: 10.1093/mnras/staa1967
- Аннотация: We present observations and models of the kinematics and the distribution of the neutral hydrogen (H I) 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 H I disc of WLM extends out to a major axis diameter of 30' (8.5 kpc), and a minor axis diameter of 20' (5.6 kpc) as measured by the GBT. We use the MeerKAT data to model WLM using the TiRiFiC software suite, allowing us to fit different tilted-ring models and select the one that best matches the observation. Our final best-fitting model is a flat 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 2σ 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 fit 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.
- Добавил в систему: Сабурова Анна Станиславовна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | Полный текст | 2007.01292.pdf | 7,7 МБ | 17 августа 2020 [Saburova_Anna] |