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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/27751
Title: Dark halo structure in the Carina dwarf spheroidal galaxy: joint analysis of multiple stellar components
Authors: Hayashi, Kohei
FABRIZIO, Michele 
Łokas, Ewa L.
Bono, Giuseppe
Monelli, Matteo
DALL'ORA, Massimo 
Stetson, Peter B.
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 481
Issue: 1
First Page: 250
Abstract: Photometric and spectroscopic observations of the Carina dSph revealed that this galaxy contains two dominant stellar populations of different age and kinematics. The coexistence of multiple populations provides new constraints on the dark halo structure of the galaxy, because different populations should be in equilibrium in the same dark matter potential well. We develop non-spherical dynamical models including such multiple stellar components and attempt to constrain the properties of the non-spherical dark halo of Carina. We find that Carina probably has a larger and denser dark halo than found in previous works and a less cuspy inner dark matter density profile, even though the uncertainties of dark halo parameters are still large due to small volume of data sample. Using our fitting results, we evaluate astrophysical factors for dark matter annihilation and decay and find that Carina should be one of the most promising detectable targets among classical dSph galaxies. We also calculate stellar velocity anisotropy profiles for both stellar populations and find that they are both radially anisotropic in the inner regions, while in the outer regions the older population becomes more tangentially biased than the intermediate ones. This is consistent with the anisotropy predicted from tidal effects on the dynamical structure of a satellite galaxy and thereby can be considered as kinematic evidence for the tidal evolution of Carina.
URI: http://hdl.handle.net/20.500.12386/27751
URL: https://academic.oup.com/mnras/article/481/1/250/5078376
ISSN: 0035-8711
DOI: 10.1093/mnras/sty2296
Bibcode ADS: 2018MNRAS.481..250H
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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