Bibcode
Brunino, Riccardo; Trujillo, I.; Pearce, Frazer R.; Thomas, Peter A.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 375, Issue 1, pp. 184-190.
Fecha de publicación:
2
2007
Número de citas
79
Número de citas referidas
74
Descripción
Using the Millennium N-body Simulation we explore how the shape and
angular momentum of galaxy dark matter haloes surrounding the largest
cosmological voids are oriented. We find that the major and intermediate
axes of the haloes tend to lie parallel to the surface of the voids,
whereas the minor axis points preferentially in the radial direction. We
have quantified the strength of these alignments at different radial
distances from the void centres. The effect of these orientations is
still detected at distances as large as 2.2 Rvoid from the
void centre. Taking a subsample of haloes expected to contain
disc-dominated galaxies at their centres we detect, at the 99.9 per cent
confidence level, a signal that the angular momentum of those haloes
tends to lie parallel to the surface of the voids. Contrary to the
alignments of the inertia axes, this signal is only detected in shells
at the void surface (1 < R < 1.07Rvoid) and disappears
at larger distances. This signal, together with the similar alignment
observed using real spiral galaxies, strongly supports the prediction of
the Tidal Torque theory that both dark matter haloes and baryonic matter
have acquired, conjointly, their angular momentum before the moment of
turnaround.