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
复制
发表时间:
2015
影响因子:
4.8
通讯作者:
Baumgardt
Baumgardt
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zonoozi;Kroupa;Banerjee;Baumgardt

文献摘要

参考文献

被引文献

相似文献

我们进行了一系列的直接N体计算,以调查从气体嵌入的祖先的今天的球状星团(GC)的恒星质量函数(MF)的残余气体驱逐的效果。我们的模型要么开始潮汐填充或欠填充,无论有或没有原始质量分离。我们覆盖了1亿年的模拟星系团的演化,并表明,从最初的质量分离的星系团中排出的残余气体导致了低质量(m≤ 0.50 M <$)和中等质量(m ≤ 0.50-0.85 M <$)星系团中恒星MF的明显较浅的斜率。因此,残余气体排出和原始质量分离的印记可能是可见的,在今天的MF。我们发现,外部潮汐场的强度作为一个重要的参数,影响着星系团的扁平程度,使得rh/rt≥ 0.1的初始质量分异潮汐填充星系团在中等恒星质量范围内表现出强烈的MF亏损。因此,在这个质量范围内的现今恒星MF的形状探测了星系团在银河系环境中的诞生地。我们还发现,这种扁平同意与观察到的集群的浓度和MF斜率之间的相关性,发现由de Marchi等人。我们表明,如果通过原始质量分离的集群中的残余气体排出的膨胀是这种相关性的原因,那么GC最有可能形成在强烈波动的局部潮汐场在早期的原银河系的潜力,支持最近的结论由Marks和Kroupa。
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.
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
球状星团中原初质量偏析的证据
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
恒星形成云的深度成像调查。V. 新的赫比格-哈罗冲击和金牛座的巨大外流
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
潮汐场中球状星团的 N 体模拟:中等质量黑洞的影响
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