The structural evolution of galaxies with both thin and thick discs
The structural evolution of galaxies with both thin and thick discs
复制标题
薄盘和厚盘星系的结构演化
DOI:
10.1093/mnras/stx1300
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发表时间:
2017
影响因子:
4.8
通讯作者:
Aumer M
中科院分区:
文献类型:
--
作者:
Aumer M
We perform controlledN-body simulations of disc galaxies growing within live dark matter (DM) haloes to present-day galaxies that contain both thin and thick discs. We consider two types of models: (a) thick-disc initial conditions to which stars on near-circular orbits are continuously added over ∼10 Gyr, and (b) models in which the birth velocity dispersion of stars decreases continuously over the same time-scale. We show that both schemes produce double-exponential vertical profiles similar to that of the Milky Way (MW). We indicate how the spatial age structure of galaxies can be used to discriminate between scenarios. We show that the presence of a thick disc significantly alters and delays bar formation and thus makes possible models with a realistic baranda high baryon-to-DM mass ratio in the central regions, as required by microlensing constraints. We examine how the radial mass distribution in stars and DM is affected by disc growth and non-axisymmetries. We discuss how bar buckling shapes the vertical age distribution of thin- and thick-disc stars in the bar region. The extent to which the combination of observationally motivated inside-out growth histories and cosmologically motivated dark halo properties leads to the spontaneous formation of non-axisymmetries that steer the models towards present-day MW-like galaxies is noteworthy.
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影响因子:
4.8
作者:
Ma, Xiangcheng;Hopkins, Philip F.;Wetzel, Andrew R.;Kirby, Evan N.;Anglés-Alcázar, Daniel;Faucher-Giguère, Claude-André;Kereš, Dušan;Quataert, Eliot
通讯作者:
Quataert, Eliot
DOI:
10.1088/0004-637x/799/2/209
发表时间:
2014-09
期刊:
The Astrophysical Journal
影响因子:
--
作者:
E. Wisnioski;N. F. Schreiber;S. Wuyts;E. Wuyts;K. Bandara;D. Wilman;R. Genzel;R. Bender;R. Da
通讯作者:
E. Wisnioski;N. F. Schreiber;S. Wuyts;E. Wuyts;K. Bandara;D. Wilman;R. Genzel;R. Bender;R. Da
DOI:
10.3847/0004-637x/831/2/139
发表时间:
2016-09
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Martig;I. Minchev;M. Ness;M. Fouesneau;H. Rix
通讯作者:
M. Martig;I. Minchev;M. Ness;M. Fouesneau;H. Rix
DOI:
--
发表时间:
2016
期刊:
影响因子:
--
作者:
C. Wegg;O. Gerhard;Matthieu Portail
通讯作者:
Matthieu Portail