J/A+A/570/A106 VIPERS. Searching for cosmic voids (Micheletti+, 2014)
The VIMOS Public Extragalactic Redshift Survey. Searching for cosmic voids.
Micheletti D., Hawken A., Iovino A.J., Granett B., Bolzonella M., Cappi A.,
Abbas U., Adami C., Arnouts S., Bel J., Bottini D., Branchini E., Coupon J.,
Cucciati O., Davidzon I., De Lucia G., de la Torre S., Fritz A.,
Franzetti P., Fumana M., Garilli B., Guzzo L., Ilbert O., Krywult J.,
Le Brun V., Le Fevre O., Maccagni D., Malek K., Marulli F., McCracken H.J.,
Polletta M., Pollo A., Schimd C., Scodeggio M., Tasca L.A.M., Tojeiro R.,
Vergani D., Zanichelli A., Burden A., Di Porto C., Marchetti A.,
Marinoni C., Mellier Y., Moutard T., Moscardini L., Nichol R.C.,
Peacock J.A., Percival W.J., Zamorani G.
<Astron. Astrophys. 570, A106 (2014)>
=2014A&A...570A.106M 2014A&A...570A.106M
ADC_Keywords: Galaxy catalogs - Redshifts
Keywords: galaxies: general - cosmology: observations -
large-scale structure of universe
Abstract:
Characterisation of cosmic voids gives unique information about the
large-scale distribution of galaxies, their evolution, and
the cosmological model.
We identify and characterise cosmic voids in the VIMOS Public
Extragalactic Redshift Survey (VIPERS) at redshift 0.55 <z< 0.9.
A new void search method is developed based upon the identification of
empty spheres that fit between galaxies. The method can be used to
characterise the cosmic voids despite the presence of complex survey
boundaries and internal gaps. We investigate the impact of systematic
observational effects and validate the method against mock catalogues.
We measure the void size distribution and the void-galaxy correlation
function.
Description:
File voidtable.dat lists the catalogue of maximal spheres detected in
VIPERS samples, divided in groups corresponding to individual voids.
The spheres have been associated with larger under-densities using the
percolation method, thus we associate each sphere with a void index
indicating larger empty regions.
The identification number (ID) of each maximal sphere is composed of:
the VIPERS field to which the maximal sphere belongs (W1 or W4); a
void index indicating to which void the sphere belongs (VVVV); a
sphere index SSSS indicating the size rank of the sphere relative to
other maximal spheres within the same void. The complete ID has the
form Wx.VVVV.SSSS.
For each maximal sphere of our catalogue we provide: its ID; its
comoving radius in Mpc (Ωm=0.27, ΩΛ=0.73 and
H0=70km/s/Mpc); the right ascension, declination, and redshift of
the sphere's centre; a p-value giving the detection significance
with respect to a Poisson distribution. Voids are sorted in ascending
redshift order, with the redshift associated with each void being that
of its largest sphere. Spheres inside each void are sorted in
decreasing radius order.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
void.dat 50 388 List of maximal spheres detected in VIPERS samples
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See also:
http://vipers.inaf.it : VIPERS database
Byte-by-byte Description of file: void.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ID ID of maximal sphere (Wx.VVVV.SSS) (1)
13- 17 F5.2 Mpc r [14/32] Maximal sphere radius
19- 26 F8.4 deg RAdeg Right ascension (J2000.0)
28- 34 F7.4 deg DEdeg Declination (J2000.0)
36- 41 F6.4 --- z [0.54/0.91] Redshift
43- 50 E8.3 --- p-value Detection significance value
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Note (1): The identification number (ID) of each maximal sphere is composed of:
the VIPERS field to which the maximal sphere belongs (W1 or W4); a
void index indicating to which void the sphere belongs (VVVV); a
sphere index SSS indicating the size rank of the sphere relative to
other maximal spheres within the same void. The complete ID has the
form Wx.VVVV.SSS.
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Acknowledgements:
Angela Iovino, angela.iovino(at)brera.inaf.it
(End) Patricia Vannier [CDS] 08-Sep-2014