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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 720271.0, MPI für Astronomie / Publikationen_mpia
Why the Milky Way's bulge is not only a bar formed from a cold thin disk
Authors:Di Matteo, P.; Gómez, A.; Haywood, M.; Combes, F.; Lehnert, M. D.; Ness, M.; Snaith, O. N.; Katz, D.; Semelin, B.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:Astronomy and Astrophysics
Volume:577
Start Page:id. A1 (9 pp)
Audience:Not Specified
Abstract / Description:By analyzing an N-body simulation of a bulge formed simply via a bar instability mechanism operating on a kinematically cold stellar disk, and by comparing the results of this analysis with the structural and kinematic properties of the main stellar populations of the Milky Way bulge, we conclude that the bulge of our Galaxy is not a pure stellar bar formed from a pre-existing thin stellar disk, as some studies have recently suggested. On the basis of several arguments emphasized in this paper, we propose that the bulge population that, in the Milky Way, is observed to not be part of the peanut structure corresponds to the old Galactic thick disk, thus implying that the Milky Way is a pure thin+thick disk galaxy, with only a possible limited contribution by a classical bulge.
Free Keywords:methods: numerical; Galaxy: bulge; Galaxy: evolution; Galaxy: kinematics and dynamics; Galaxy: abundances
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-6361
URL:http://cdsads.u-strasbg.fr/abs/2015A%26A...577A......
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