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J/ApJ/744/82 Orientation of disk galaxies around cosmic voids (Varela+, 2012)
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Beginning of ReadMe :J/ApJ/744/82 Catalog of cosmic voids from the SDSS-DR7 (Varela+, 2012)
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The orientation of disk galaxies around large cosmic voids.
Varela J., Betancort-Rijo J., Trujillo I., Ricciardelli E.
<Astrophys. J., 744, 82 (2012)>
=2012ApJ...744...82V
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ADC_Keywords: Galaxies, optical ; Morphology ; Redshifts
Keywords: galaxies: spiral - galaxies: statistics -
large-scale structure of universe
Abstract:
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
M_r_-5log h=-20.17) with radii larger than 10h^-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 > 15h^-1^Mpc within distances not
much larger than 5h^-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 > 15h^-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.
Description:
In this work, we revisit the analysis of the alignment of galaxies
around voids with two significant improvements. First, we make use of
the latest data release of the SDSS (SDSS-DR7, Cat. II/294) and we
combine it with the morphological classification from the Galaxy Zoo
project (Banerji et al. 2010MNRAS.406..342B; Lintott et al. 2011,
Cat. J/MNRAS/410/166) to select disk galaxies. Second, we have
developed a statistical procedure to partially correct the
indetermination in the spin direction due to the projection effect so
that we can also obtain information from galaxies that are not edge-on
or face-on, increasing by a factor of three the effective number of
galaxies that are used in our analysis with respect to the restriction
to edge-on and face-on galaxies.
Our main source of data has been the New York University Value-Added
Galaxy Catalog (NYU-VACG; Blanton et al. 2005AJ....129.2562B;
Padmanabhan et al. 2008ApJ...674.1217P; Adelman-McCarthy et al. 2008,
Cat. II/282, superseded by Cat. II/294), which is based on the
photometric and spectroscopic catalog of the SDSS-DR7 (Strauss et al.
2002AJ....124.1810S).