Possible smoking-gun evidence for initial mass segregation in re-virialized post-gas expulsion globular clusters
Possible smoking-gun evidence for initial mass segregation in re-virialized post-gas expulsion globular clusters
复制标题
重新病毒化后气体排出球状星团中初始质量分离的可能确凿证据
DOI:
10.1093/mnras/stv2207
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发表时间:
2015
影响因子:
4.8
通讯作者:
Baumgardt
中科院分区:
文献类型:
--
作者:
Zonoozi;Kroupa;Banerjee;Baumgardt
We perform a series of directN-body calculations to investigate the effect of residual gas expulsion from the gas-embedded progenitors of present-day globular clusters (GCs) on the stellar mass function (MF). Our models start either tidally filling or underfilling, and either with or without primordial mass segregation. We cover 100 Myr of the evolution of modelled clusters and show that the expulsion of residual gas from initially mass-segregated clusters leads to a significantly shallower slope of the stellar MF in the low- (m≤ 0.50 M⊙) and intermediate-mass (≃ 0.50–0.85 M⊙) regime. Therefore, the imprint of residual gas expulsion and primordial mass segregation might be visible in the present-day MF. We find that the strength of the external tidal field, as an essential parameter, influences the degree of flattening, such that a primordially mass-segregated tidally filling cluster withrh/rt≥ 0.1 shows a strongly depleted MF in the intermediate stellar mass range. Therefore, the shape of the present-day stellar MF in this mass range probes the birth place of clusters in the Galactic environment. We furthermore find that this flattening agrees with the observed correlation between the concentration of a cluster and its MF slope, as found by de Marchi et al.. We show that if the expansion through the residual gas expulsion in primordial mass segregated clusters is the reason for this correlation then GCs most probably formed in strongly fluctuating local tidal fields in the early proto-Milky Way potential, supporting the recent conclusion by Marks & Kroupa.
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DOI:
10.1111/j.1365-2966.2012.20767.x
发表时间:
2012-02
影响因子:
4.8
作者:
M. Marks;P. Kroupa;J. Dabringhausen;M. Pawlowski
通讯作者:
M. Marks;P. Kroupa;J. Dabringhausen;M. Pawlowski
DOI:
10.1111/j.1365-2966.2008.13165.x
发表时间:
2008
影响因子:
4.8
作者:
M. Marks;P. Kroupa;H. Baumgardt
通讯作者:
H. Baumgardt
DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
H. Baumgardt;G. de Marchi;P. Kroupa
通讯作者:
P. Kroupa
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
J. Bally;J. Walawender;B. Reipurth
通讯作者:
B. Reipurth
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
N. Lutzgendorf;H. Baumgardt;J. Kruijssen
通讯作者:
J. Kruijssen