J/A+A/462/811 Superclusters of galaxies from 2dF (Einasto+, 2007)
Superclusters of galaxies from the 2dF redshift survey. I. The catalogue.
Einasto J., Einasto M., Tago E., Saar E., Hutsi G., Joeveer M.,
Liivamagi L.J., Suhhonenko I., Jaaniste J., Heinamaki P., Muller V.,
Knebe A., Tucker D.
<Astron. Astrophys. 462, 811 (2007)>
=2007A&A...462..811E 2007A&A...462..811E
ADC_Keywords: Clusters, galaxy ; Morphology
Keywords: cosmology: large-scale structure of the Universe -
galaxies: clusters: general
Abstract:
We use the 2dF Galaxy Redshift Survey data to compile catalogues of
superclusters for the Northern and Southern regions of the 2dFGRS,
altogether 543 superclusters at redshifts 0.009<z<0.2. We apply
the density field method using smoothing with an Epanechnikov kernel
of radius 8Mpc. We derive positions of the highest luminosity
density peaks and find the most luminous cluster in the vicinity of
the peak, this cluster is considered as the main cluster and its
brightest galaxy the main galaxy of the supercluster. In catalogues we
give equatorial coordinates and distances of superclusters as
determined by positions of their main clusters. We also calculate the
expected total luminosities of the superclusters.
Description:
Tables contain data on superclusters, selected from the 2dFGRS survey.
Catalogues consist of four lists, two for each Galaxy hemisphere, the
main lists A for superclusters up to distance 520Mpc/h, and
supplementary lists B for more distant systems. The lists are ordered
according to increasing RA, a common id-numeration for lists A and B.
Distance and sizes are given in Mpc/h, luminosities in Solar units
L☉/h^2, where h is the Hubble constant in units of 100km/s/Mpc
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
scl2dfna.dat 121 159 Catalog of superclusters, Northern region (d<520Mpc)
scl2dfnb.dat 121 70 Catalog of superclusters, Northern region (d>520Mpc)
scl2dfsa.dat 121 220 Catalog of superclusters, Southern region (d<520Mpc)
scl2dfsb.dat 121 94 Catalog of superclusters, Southern region (d>520Mpc)
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See also:
http://www.mso.anu.edu.au/2dFGRS : The 2dF Galaxy Redshift Survey Home Page
VII/226 : The 2dF Galaxy Redshift Survey 100k Data Release (2dFGRS Team, 2001)
J/MNRAS/329/87 : 2dF Galaxy Redshift Survey: galaxy clusters (de Propris+ 2002)
J/A+A/459/L1 : Supercluster sample from SDSS DR4 (Einasto+, 2006)
Byte-by-byte Description of file: scl2df*
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Bytes Format Units Label Explanations
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1- 4 A4 --- Seq Identification number, SNNN or NNNN,
(S)outh or (N)orth region
6- 14 F9.5 deg RAdeg Right Ascension (for the epoch J2000)
16- 24 F9.5 deg DEdeg Declination (for the epoch J2000)
26- 31 F6.2 Mpc Dist Distance (in Mpc/h, assuming h=100km/s/Mpc)
33- 37 F5.2 Mpc Dmin Minimal size of the supercluster (in Mpc/h) (1)
39- 44 F6.2 Mpc Dmax Maximal diameter (in Mpc/h) (2)
46- 50 F5.2 Mpc Deff Effective diameter (in Mpc/h) (3)
52- 55 F4.2 --- eps0 Ratio of the mean to effective diameter (4)
57- 61 F5.2 Mpc D0 Center offset parameter (5)
63- 67 F5.2 --- Speak Peak supercluster density (7)
69- 73 F5.2 --- Smean Mean supercluster density (7)
75- 78 I4 --- Ngal Number of galaxies in the supercluster
80- 83 I4 --- Ngr Number of groups (including groups with only
one visible galaxy) in the supercluster
85- 86 I2 --- Ncl Multiplicity of the supercluster
(the number of DF-clusters)
88- 93 I6 --- ID Identification of the main cluster by
Tago et al., 2006AN....327..365T 2006AN....327..365T (6)
95- 97 I3 --- Ngvis Number of visible galaxies in the main cluster
99-109 E11.5 solLum Lmain Luminosity of the main galaxy,
(in bj, Solar units L☉/h2)
111-121 E11.5 solLum Ltot Total estimated luminosity of the supercluster
(in bj, Solar units L☉/h2)
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Note (1): Dmin=min(dx,dy,dz), where dx, dy, and dz are sizes of the
supercluster along coordinates x,y,z.
Note (2): Diagonal of the box containing the supercluster,
Dmax=(dx2+dy2+dz2){1/2}.
Note (3): The diameter of the sphere, equal to the volume of the supercluster
Note (4): eps0=Dm/De, here Dm=Dmax/3{1/3} is the mean diameter.
Note (5): Δo=((x0-xm)2+(y0-ym)2+(z0-zm)2){1/2};
here x0, y0, z0 are coordinates of the geometric center,
and xm, ym, zm are coordinates of the dynamical center
(main cluster) of the supercluster.
Note (6): Identification number of the main cluster (group number) for
galaxies in group, or identification number of the galaxy for
isolated galaxies (not in group).
Note (7): densities are expressed in units of the mean density of the
whole sample.
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Acknowledgements:
Jaan Einasto, einasto(at)aai.ee
(End) Patricia Vannier [CDS] 01-Dec-2006