دورية أكاديمية
Kinematics of the Tucana dwarf galaxy: an unusually dense dwarf in the Local Group
| العنوان: | Kinematics of the Tucana dwarf galaxy: an unusually dense dwarf in the Local Group |
|---|---|
| المؤلفون: | Gregory, Alexandra l., Collins, Michelle l. M., Read, Justin I., Irwin, Michael J., Ibata, Rodrigo A., Martin, Nicolas F., McConnachie, Alan W., Weisz, Daniel R. |
| بيانات النشر: | Oxford |
| سنة النشر: | 2019 |
| المجموعة: | National Research Council Canada: NRC Publications Archive |
| مصطلحات موضوعية: | galaxies: dwarf, galaxies: evolution, galaxies: haloes, galaxies: kinematics and dynamics, Local Group |
| الوصف: | We present new FLAMES+GIRAFFE spectroscopy of 36 member stars in the isolated Local Group dwarf spheroidal galaxy Tucana. We measure a systemic velocity for the system of vTuc=216.7⁺².⁹−₂.₈ km s⁻¹, and a velocity dispersion of σv,Tuc=14.4⁺².⁸−₂.₃ km s−¹. We also detect a rotation gradient of dvᵣ/dχ=7.6⁺⁴.²−₄.₃ km s−¹ kpc−¹, which reduces the systemic velocity to vTuc=215.2⁺².⁸−₂.₇ km s−¹ and the velocity dispersion to σv,Tuc=13.3⁺².⁷−₂.₃ km s−¹. We perform Jeans modelling of the density profile of Tucana, using the line-of-sight velocities of the member stars. We find that it favours a high central density consistent with ‘pristine’ subhaloes in Λ cold dark matter, and a massive dark matter halo (∼10¹⁰ M⊙) consistent with expectations from abundance matching. Tucana appears to be significantly more centrally dense than other isolated Local Group dwarfs, making it an ideal laboratory for testing dark matter models. ; Peer reviewed: Yes ; NRC publication: Yes |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | text |
| اللغة: | English |
| تدمد: | 0035-8711 1365-2966 |
| العلاقة: | Monthly Notices of the Royal Astronomical Society, Volume: 485, Issue: 2, Publication date: 2019-02-20, Pages: 2010–2025 |
| DOI: | 10.1093/mnras/stz518 |
| الإتاحة: | https://doi.org/10.1093/mnras/stz518Test https://nrc-publications.canada.ca/eng/view/object/?id=cbbdd6f1-606a-4097-87b8-569116382c0fTest https://nrc-publications.canada.ca/fra/voir/objet/?id=cbbdd6f1-606a-4097-87b8-569116382c0fTest |
| رقم الانضمام: | edsbas.A44C6A76 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 00358711 13652966 |
|---|---|
| DOI: | 10.1093/mnras/stz518 |