Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-11-26
Astrophys.J.478:L53-L56,1997
Astronomy and Astrophysics
Astrophysics
15 pages, submitted to ApJL
Scientific paper
10.1086/310557
We find that satellites of isolated disk galaxies at projected radii between 300 and 500 kpc are distributed asymmetrically about the parent galaxy and aligned preferentially with the disk minor axis. The dynamical timescale at these radii is sufficiently long that the shape of this distribution must reflect the formation history of the outer halo rather than its internal evolution. We also find that the orbital angular momenta of satellites at projected major axis distances of $\ltsim$ 200 kpc tend to align with that of the central disk. These results demonstrate that satellites are dynamically related to their primary galaxy. Satellites drawn from current simulations of hierarchical galaxy formation exhibit neither the systematic alignment nor the net rotation with the central disk that we find in the data.
Frenk Carlos S.
Smith Rodney
White Simon D. M.
Zaritsky Dennis
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