Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-13
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures, accepted for publication as MNRAS Letter
Scientific paper
10.1111/j.1745-3933.2008.00495.x
We explore the radial alignment of subhalos in 2-dimensional projections of cosmological simulations. While most other recent studies focussed on quantifying the signal utilizing the full 3-dimensional spatial information any comparison to observational data has to be done in projection along random lines-of-sight. We have a suite of well resolved host dark matter halos at our disposal ranging from 6 x 10^14 Msun/h down to 6 x 10^13Msun/h. For these host systems we do observe that the major axis of the projected 2D mass distribution of subhalos aligns with its (projected) distance vector to the host's centre. The signal is actually stronger than the observed alignment. However, when considering only the innermost 10-20% of the subhalo's particles for the 2D shape measurement we recover the observed correlation. We further acknowledge that this signal is independent of subhalo mass.
Gibson Brad K.
Kase Hiroyuki
Knebe Alexander
Lewis Geraint
Yahagi Hideki
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