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J/ApJ/744/82      Catalog of cosmic voids from the SDSS-DR7     (Varela+, 2012)

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
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 Mr-5log h=-20.17) with radii larger than 10h-1Mpc 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-1Mpc within distances not much larger than 5h-1Mpc 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-1Mpc 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). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 60 699 Catalog of voids
See also: II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009) J/MNRAS/410/166 : Morphological types from Galaxy Zoo 1 (Lintott+, 2011) J/MNRAS/415/1188 : Galaxies in the Lynx-Cancer void (Pustilnik+, 2011) J/A+A/319/67 : HI observations of dwarf galaxies in voids (Huchtmeier+ 1997) J/A+AS/116/43 : Emission-line galaxies nearby voids. (Popescu+, 1996) J/ApJ/314/493 : Boo Void survey (Kirshner+, 1987) : NYU Value-Added Galaxy Catalog home page : SDSS home page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 F8.3 Mpc X Cartesian X coordinate of void's center (1) 10- 17 F8.3 Mpc Y Cartesian Y coordinate of void's center (1) 19- 25 F7.3 Mpc Z Cartesian Z coordinate of void's center (1) 27- 32 F6.3 Mpc Rad Void's radius (1) 34- 43 F10.6 deg RAdeg Right Ascension of void's center (J2000) 45- 53 F9.6 deg DEdeg Declination of void's center (J2000) 55- 60 F6.4 --- z Redshift of void's center
Note (1): the cosmology is defined with, ΩM=0.3, Ω_Λ=0.7. Distances are h-1Mpc. The cartesian coordinates refer to the ICRS frame.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Jun-2013
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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