J/MNRAS/344/602 Shape statistics of SDSS superclusters (Basilakos, 2003)
Shape statistics of Sloan Digital Sky Survey superclusters. Basilakos S. <Mon. Not. R. Astron. Soc. 344, 602 (2003)> =2003MNRAS.344..602B
ADC_Keywords: Clusters, galaxy ; Morphology Keywords: galaxies: clusters: general - cosmology: theory - large-scale structure of Universe Abstract: We study the supercluster shape properties of the recently compiled Sloan Digital Sky Survey (SDSS) cluster catalogue using an approach based on differential geometry. We detect superclusters by applying the percolation algorithm to observed cluster populations, extended out to zmax≤0.23 in order to avoid selection biases. We utilize a set of shapefinders in order to study the morphological features of superclusters with ≥8 cluster members and find that filamentary morphology is the dominant supercluster shape feature, in agreement with previous studies. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 76 57 List of the SDSS superclusters using Rpr=26h-1Mpc.
See also: J/AJ/123/1807 : SDSS galaxy clusters redshifts (Goto+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
2- 3 I2 --- [B2003] Index 5- 6 I2 --- K Multiplicity (1) 9- 14 F6.2 Mpc alpha1 alpha1 (semi-major) axis, in h^-1^Mpc (1) 17- 21 F5.2 Mpc alpha2 alpha2 axis, in h^-1^Mpc (1) 24- 28 F5.2 Mpc alpha3 alpha3 axis, in h^-1^Mpc (1) 31- 35 F5.3 --- z Redshift 38- 43 F6.2 deg RAdeg Supercluster center Right ascension in decimal degrees (J2000) 45- 50 F6.2 deg DEdeg Supercluster center Declination in decimal degrees (J2000) 53- 57 F5.3 --- K1 Shapefinder K1 (2) 60- 64 F5.3 --- K2 Shapefinder K2 (2) 67- 70 F4.2 --- R K1/K2 ratio 72- 76 A5 --- Type Morphological classification type (3)
Note (1): Eigenvalues directly related to the three principal axes of the fitted ellipsoid Note (2): Shapefinders are defined as K1=(H2-H1)/(H2+H1) and K2=(H3-H2)/(H3+H2) where H1=V/S, H2 =S/C and H3=C with S being the surface area, C being the integrated mean curvature, and V the volume of the fitted ellipsoid. Note (3): Morphological classification type: F denotes filaments, P denotes pancakes and cT denotes close to triaxial. B means that the specific entry is close to the boundaries of the SDSS cluster catalogue.
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 24-Oct-2003
|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|