Probing the thick disc formation scenarios outside the solar neighbourhood

Details Probing the thick disc formation scenarios outside the solar neighbourhood Probing the thick disc formation scenarios outside the solar neighbourhood

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..311k&link_type=abstract

SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,

Astronomy and Astrophysics

Astrophysics

Galaxy: Evolution -- Galaxy: Kinematics And Dynamics -- Stars: Abundances -- Methods: Observational

Scientific paper

The origin and evolution of the Milky Way remains one of the key unanswered questions in astrophysics. From a sample of roughly 700 stars selected in order to probe the galactic thick disc outside the solar neighborhood, we investigate the radial scale length and scale height of this structure, based on the spectroscopic measurement of its star members. Estimations of the scale height and scale lengths for different metallicity bins result in consistent values, with HrValue and HzValue, showing no evidence of relics of destroyed massive satellites and challenging the radial migration mechanisms as being the most important processes of creation of the thick disc.

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