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The merger debris of dwarf galaxies in the local stellar halo

Published online by Cambridge University Press:  30 October 2019

Cuihua Du Open the ORCID record for Cuihua Du [Opens in a new window] ,
Hefan Li  and
Heidi Jo Newberg
Cuihua Du
Affiliation:
College of Astronomy and Space Sciences, University of Chinese Academy of Sciences, Beijing 100049, China email: ducuihua@ucas.ac.cn
Hefan Li
Affiliation:
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Heidi Jo Newberg
Affiliation:
Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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Abstract

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Based on the second Gaia data release and spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data, we identified 23,582 halo stars kinematically. The halo streams in the solar neighborhood could be detected in the space of energy and angular momentum. We reshuffle the velocities of these stars to determine the significance of the substructure. Finally, we find 14 statistically significant substructures and several substructures are not reported by previous works. These structures may be the debris of dwarf galaxies accretion event and their dynamical and chemical information can help to understand the history of the Galaxy.

Keywords

Galaxy: kinematics and dynamicsGalaxy: haloSolar neighborhood
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 38 - 41
Copyright
© International Astronomical Union 2019 

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