Orbital evolution of the Carina dwarf galaxy and self-consistent determination of star formation history

被引：51
作者：
Pasetto, S. [1 ,2 ]
Grebel, E. K. [1 ]
Berczik, P. [1 ,4 ,5 ]
Chiosi, C. [3 ]
Spurzem, R. [1 ,4 ]
机构：
[1] Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, D-69117 Heidelberg, Germany
[2] Max Planck Inst Astron, D-69117 Heidelberg, Germany
[3] Univ Padua, Dept Astron, I-35100 Padua, Italy
[4] Chinese Acad Sci, NAOC, Beijing 100012, Peoples R China
[5] Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev, Ukraine
来源：
ASTRONOMY & ASTROPHYSICS | 2011年 / 525卷
关键词：
galaxies: dwarf; Local Group; galaxies: kinematics and dynamics; celestial mechanics; galaxies: evolution; EXPLORING HALO SUBSTRUCTURE; DIGITAL SKY SURVEY; DARK-MATTER HALO; VELOCITY DISPERSION PROFILES; HORIZONTAL-BRANCH STARS; LARGE-MAGELLANIC-CLOUD; TO-LIGHT RATIO; MILKY-WAY; SPHEROIDAL GALAXIES; DYNAMICAL FRICTION;
D O I：
10.1051/0004-6361/200913415
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页数：15
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