Bibcode
Varela, J.; Betancort-Rijo, J. E.; Trujillo, I.; Ricciardelli, Elena
Bibliographical reference
The Astrophysical Journal, Volume 744, Issue 2, article id. 82 (2012).
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1
2012
Journal
Citations
72
Refereed citations
61
Description
Using a large sample of galaxies from the the seventh data release of
the Sloan Digital Sky Survey (SDSS-DR7), we have analyzed the alignment
of disk galaxies around cosmic voids. We have constructed a complete
sample of cosmic voids (devoid of galaxies brighter than Mr
- 5log h = -20.17) with radii larger than 10 h
-1 Mpc up to redshift 0.12. Disk galaxies in shells
around these voids have been used to look for particular alignments
between the angular momentum of the galaxies and the radial direction of
the voids. We find that disk galaxies around voids larger than >~ 15
h -1 Mpc within distances not much larger than 5 h
-1 Mpc from the surface of the voids present a
significant tendency to have their angular momenta aligned with the
void's radial direction with a significance >~ 98.8% against the null
hypothesis. The strength of this alignment is dependent on the void's
radius and for voids with a radius <~ 15 h -1 Mpc
the distribution of the orientation of the galaxies is compatible with a
random distribution. Finally, we find that this trend observed in the
alignment of galaxies is similar to the one observed for the minor axis
of dark matter halos around cosmic voids found in cosmological
simulations, suggesting a possible link in the evolution of both
components.
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