J/MNRAS/352/939 2dFGRS Wiener reconstruction of cosmic web (Erdogdu+, 2004)
The 2dF Galaxy Redshift Survey: Wiener reconstruction of the cosmic web.
Erdogdu P., Lahav O., Zaroubi S., Efstathiou G., Moody S., Peacock J.A.,
Colless M., Baldry I.K., Baugh C.M., Bland-hawthorn J., Bridges T.,
Cannon R., Cole S., Collins C., Couch W., Dalton G., De Propris R.,
Driver S.P., Ellis R.S., Frenk C.S., Glazebrook K., Jackson C., Lewis I.,
Lumsden S., Maddox S., Madgwick D., Norberg P., Peterson B.A.,
Sutherland W., Taylor K.
<Mon. Not. R. Astron. Soc., 352, 939-960 (2004)>
=2004MNRAS.352..939E 2004MNRAS.352..939E
ADC_Keywords: Galactic pole, north ; Galactic pole, south ; Redshifts
Keywords: methods: statistical - galaxies: distances and redshifts -
large-scale structure of Universe
Abstract:
We reconstruct the underlying density field of the Two-degree Field
Galaxy Redshift Survey (2dFGRS, VII/226) for the redshift range
0.035<z<0.200 using the Wiener filtering method. The Wiener filter
suppresses shot noise and accounts for selection and incompleteness
effects. The method relies on prior knowledge of the 2dF power
spectrum of fluctuations and the combination of matter density and
bias parameters, however the results are only slightly affected by
changes to these parameters. We present maps of the density field. We
use a variable smoothing technique with two different effective
resolutions: 5 and 10h-1Mpc at the median redshift of the survey. We
identify all major superclusters and voids in the survey. In
particular, we find two large superclusters and two large local voids.
The full set of colour maps can be viewed on the World Wide Web at
http://www.ast.cam.ac.uk/~pirin .
Description:
The 2dFGRS (VII/226), now completed, is selected in the photometric
bJ band from the Automated Plate Measuring (APM, J/MNRAS/246/433)
galaxy survey and its subsequent extensions. We use the data obtained
prior to 2002 May, when the survey was nearly complete. This includes
221283 unique, reliable galaxy redshifts.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 40 The list of superclusters
table2.dat 45 39 The list of voids in the South Galactic Pole (SGP)
table3.dat 46 30 The list of voids in the North Galactic Pole (NGP)
ngp.dat 42 15236 *Maps for North Galactic Pole region
sgp.dat 42 24104 *Maps for North South Pole region
voids.dat 72 408 *Maps for voids
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Note on ngp.dat, sgp.dat, voids.dat: from
http://www.ast.cam.ac.uk/~pirin
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See also:
VII/200 : Minislice at the North Galactic Pole. II. (Willmer+ 1996)
VII/226 : The 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)
J/MNRAS/329/87 : 2dFGRS : galaxy clusters (de Propris+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [ELZ2004] Name
10- 14 F5.3 --- zmin Minimum redshift
16- 20 F5.3 --- zmax Maximum redshift
22- 26 F5.1 deg RA1deg Maximum Right ascension in decimal deg. (1950)
28- 32 F5.1 deg RA2deg Minimum Right ascension in decimal deg. (1950)
34- 39 F6.2 deg DE1deg Maximum Declination in decimal degrees (1950)
40- 45 F6.2 deg DE2deg Minimum Declination in decimal degrees (1950)
47- 48 I2 --- Ngr Number of Durham groups with more than nine
members that the supercluster contains
50- 51 I2 -- Nclus Number of Abell, APM and EDCC clusters
studied by De Propris et al. (2002, Cat.
J/MNRAS/329/87) which the supercluster has
53- 54 I2 --- Ntot Total number of groups and clusters
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- [ELZ2004] Name
9- 13 F5.3 --- zmin Minimum redshift
15- 19 F5.3 --- zmax Maximum redshift
21- 25 F5.1 deg RA1deg Maximum Right ascension in decimal deg. (1950)
27- 32 F6.2 deg RA2deg Minimum Right ascension in decimal deg. (1950)
34- 39 F6.2 deg DE1deg Maximum Declination in decimal degrees (1950)
41- 46 F6.2 deg DE2deg Minimum Declination in decimal degrees (1950)
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Byte-by-byte Description of file: ngp.dat sgp.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Zone Zone name
10- 14 F5.3 --- z Redshift
17- 23 F7.3 deg RAdeg [-90/360] Right ascension in decimal deg. (1950)
26- 32 F7.3 deg DEdeg Declination in decimal degrees (1950)
35- 42 F8.5 --- Signal Signal computed on the point
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Byte-by-byte Description of file: voids.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Region "ngp" or "sgp"
8- 13 I6 --- Seq Serial number
17- 26 F10.8 --- z Redshift
30- 39 F10.6 deg RAdeg [-90/360] Right ascension in decimal deg. (1950)
43- 52 F10.6 deg DEdeg Declination in decimal deg. (1950)
56- 62 F7.3 mag MAG Absolute magnitude
66- 72 F7.4 --- eta Characterisation of the void
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Feb-2005