cosmology as that used here.

![image](2dHisto_LM_Subfind_Peebles){width="\linewidth"}

![image](2dHisto_LM_Subfind_Bullock){width="\linewidth"}

Radial Dependence
-----------------

To understand further whether tidal stripping of high angular momentum material could cause the lower subhalo spin distribution, we investigate the radial dependence of the subhalo spins. Sub[haloes]{}located closer to the center of their host halo are likely to have undergone stronger tidal stripping than those nearer the virial radius. @onions_2013 has done some tests to support their argument, e.g. they analyze the average spin parameter of sub[haloes]{}at different distances from the center of the host halo. Here we perform a more detailed test. We stack subhalo samples from four simulations together and then make the two dimensional histogram of spin against their centric distance. Then in each radial bin we fit the subhalo sample using [Equation \[eqn:bettfit\]]{} and [Equation \[eqn:bullockfit\]]{}. Finally we make a linear fit as $\lambda_0(r)=cr/R_{vir}+d$ or $\lambda_0'(r)=cr/R_{vir}+d$. The results are displayed in [Figure \[pic2\]]{} and show that the spin of sub[haloes]{} is suppressed close to the center of the host halo. This is consistent with the argument that sub[haloes]{} loose their high angular momentum particles as they are stripped of their outer layers after infall into a main halo.

![The average Peebles (upper) and Bullock (lower) 