An anticorrelation between barycentre offsets and velocity dispersion for highest overdensity subhaloes in cosmological simulations
An anticorrelation between barycentre offsets and velocity dispersion for highest overdensity subhaloes in cosmological simulations
复制标题
宇宙学模拟中最高超密度子晕的重心偏移和速度色散之间的反相关性
DOI：
10.1093/mnras/sty1731
复制
发表时间：
2018-07
影响因子：
4.8
通讯作者：
Lin Hai Nan
中科院分区：
文献类型：
--
作者：
Li Ming Hua;Lin Hai Nan
In this paper, we use two hydrodynamic simulations to study the barycentre offsets $r_{{\rm off}}$ between the entire halo and the gas or dark matter subhalo with largest overdensity. We restrict our analysis to those halos with large rescaled offsets, i.e. $r_{{\rm off}}/r_{200}\gtrsim 0.05$. The halos which are less massive and at higher redshifts are more likely to have larger $r_{{\rm off}}/r_{200}$. The 3D velocity dispersion of the subhalos with largest overdensity is found to have a similar mass and redshift dependence as $r_{{\rm off}}/r_{200}$. We also find that the gas subhalos with maximum overdensity and larger gas velocity dispersion $\sigma_{v}^{\rm ICM,sub}/\sigma_{200}$ tend to have smaller barycentre offsets $r_{{\rm off}}/r_{200}$. Similar result is found for the highest overdensity dark matter subhalos but with less significance. This anti-correlation is more significant for the snapshot $z=0$ than $z=0.2$ and $0.5$. The underlying physical mechanism for this anti-correlation remains to be explored.
登录
查看更多内容
影响因子：
4.8
作者：
W. Cui;C. Power;V. Biffi;S. Borgani;A. Knebe;G. Murante;D. Fabjan;G. Lewis;G. Poole
通讯作者：
W. Cui;C. Power;V. Biffi;S. Borgani;A. Knebe;G. Murante;D. Fabjan;G. Lewis;G. Poole
影响因子：
6.5
作者：
D. Hudson;R. Mittal;T. Reiprich;P. Nulsen;H. Andernach;C. Sarazin
通讯作者：
D. Hudson;R. Mittal;T. Reiprich;P. Nulsen;H. Andernach;C. Sarazin
DOI：
10.1088/0004-637x/740/2/53
发表时间：
2011-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
E. Rozo;E. Rykoff;B. Koester;B. Nord;Hao Wu;A. Evrard;Risa Wechsler
通讯作者：
E. Rozo;E. Rykoff;B. Koester;B. Nord;Hao Wu;A. Evrard;Risa Wechsler
DOI：
10.1086/508601
发表时间：
2006-08
期刊：
--
影响因子：
--
作者：
M. Bradač;D. Clowe;Anthony H. Gonzalez;P. Marshall;W. Forman;C. Jones;M. Markevitch;S. Randall;T. Schrabback;Dennis Zaritsky Kipac;Stanford;AIfA;Bonn;S. Observatory;Tucson;D. O. Astronomy;Gainesville;CfA;Cambridge
通讯作者：
M. Bradač;D. Clowe;Anthony H. Gonzalez;P. Marshall;W. Forman;C. Jones;M. Markevitch;S. Randall;T. Schrabback;Dennis Zaritsky Kipac;Stanford;AIfA;Bonn;S. Observatory;Tucson;D. O. Astronomy;Gainesville;CfA;Cambridge
DOI：
10.1111/j.1365-2966.2010.16619.x
发表时间：
2009-11
影响因子：
4.8
作者：
R. Mandelbaum;U. Seljak;T. Baldauf;R. Smith
通讯作者：
R. Mandelbaum;U. Seljak;T. Baldauf;R. Smith