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|Title:||The effect of tides on the Fornax dwarf spheroidal galaxy||Authors:||Battaglia, Giuseppina
SOLLIMA, ANTONIO LUIGI
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||454||Issue:||3||First Page:||2401||Abstract:||Estimates of the mass distribution and dark-matter (DM) content of dwarf spheroidal galaxies (dSphs) are usually derived under the assumption that the effect of the tidal field of the host galaxy is negligible over the radial extent probed by kinematic data sets. We assess the implications of this assumption in the specific case of the Fornax dSph by means of N-body simulations of a satellite orbiting around the Milky Way. We consider observationally motivated orbits and tailor the initial distributions of the satellite's stars and DM to match, at the end of the simulations, the observed structure and kinematics of Fornax. In all our simulations the present-day observable properties of Fornax are not significantly influenced by tidal effects. The DM component is altered by the interaction with the Galactic field (up to 20 per cent of the DM mass within 1.6 kpc is lost.), but the structure and kinematics of the stellar component are only mildly affected even in the more eccentric orbit (more than 99 per cent of the stellar particles remain bound to the dwarf.). In the simulations that successfully reproduce Fornax's observables, the dark-to-luminous mass ratio within 1.6 kpc is in the range 5-6, and up to 16-18 if measured within 3 kpc.||Acknowledgments:||The authors thank M. Breddels for providing Fornax's LOS velocity-dispersion profile measured in elliptical annuli and the referee, M. Wilkinson, for useful comments. GB thanks the INAF - Bologna for the hospitality during part of this work and gratefully acknowledges support through a Marie-Curie action Intra European Fellowship, funded by the European Union Seventh Framework Programme (FP7/2007-2013) under Grant agreement number PIEF-GA-2010-274151, as well as the financial support by the Spanish Ministry of Economy and Competitiveness (MINECO) under the Ramon y Cajal Programme (RYC-2012-11537). AS acknowledges financial support from PRIN INAF 2011 ‘Multiple populations in globular clusters: their role in the Galaxy assembly’ (PI E. Carretta). CN thanks the Instituto de Astrofisica de Canarias for the hospitality and acknowledges financial support from PRIN MIUR 2010-2011, project ‘The Chemical and Dynamical Evolution of the Milky Way and Local Group Galaxies’, prot. 2010LY5N2T.||URI:||http://hdl.handle.net/20.500.12386/23349||URL:||https://academic.oup.com/mnras/article/454/3/2401/1197153||ISSN:||0035-8711||DOI:||10.1093/mnras/stv2096||Bibcode ADS:||2015MNRAS.454.2401B||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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