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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607249.0, MPI für Astronomie / Publikationen_mpia
Orbital evolution of the Carina dwarf galaxy and self-consistent determination of star formation history
Authors:Pasetto, S.; Grebel, E. K.; Berczik, P.; Chiosi, C.; Spurzem, R.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:Astronomy and Astrophysics
Audience:Not Specified
Abstract / Description:We present a new study of the evolution of the Carina dwarf galaxy that includes a simultaneous derivation of its orbit and star formation history. The structure of the galaxy is constrained through orbital parameters derived from the observed distance, proper motions, radial velocity, and star formation history. The different orbits admitted by the large proper motion errors are investigated in relation to the tidal force exerted by an external potential representing the Milky Way. Our analysis is performed with the aid of fully consistent N-body simulations that are able to follow the dynamics and the stellar evolution of the dwarf system in order to determine the star formation history of Carina self-consistently. We also find a star formation history characterized by several bursts, partially matching the observational expectation. We find also compatible results between dynamical projected quantities and the observational constraints. The possibility of a past interaction between Carina and the Magellanic Clouds is also separately considered and deemed unlikely. Appendices are only available in electronic form at <A href="http://www.aanda.org">http://www.aanda.org</A>
Free Keywords:galaxies: dwarf; Local Group; galaxies: kinematics and dynamics; celestial mechanics; galaxies: evolution
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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