Access to Astronomical Catalogues

← Click to display the menu
J/A+A/474/783       Main galaxy groups from SDSS-DR5               (Deng+, 2007)

The main galaxy groups from the SDSS Data Release 5. Deng X.-F., He J.-Z., Jiang P., Luo C.-H., Wu P. <Astron. Astrophys. 474, 783 (2007)> =2007A&A...474..783D
ADC_Keywords: Clusters, galaxy ; Redshifts ; Velocity dispersion Keywords: galaxies: fundamental parameters - cosmology: large-scale structure of Universe Abstract: We investigate the correlations between galaxy properties and environment. From the main galaxy sample of the SDSS Data Release 5, we have extracted 11 163 groups at the linking length R0=0.2x({bar}n)-1/3=1.97Mpc (where {bar}n is the mean number density of galaxies) by the three-dimensional friends-of-friends (FOF) algorithm, where {bar}n is the mean galaxy density, and compare basic properties of member galaxies of main galaxy groups with those of the main galaxy sample and isolated galaxies in each redshift bin. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 65 11163 The group catalog identified using the linking length b=0.2
See also: II/276 : The SDSS Photometric Catalog, Release 5 (Adelman-McCarthy+, 2007) : SDSS Home Page Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Seq Sequential number 7- 9 I3 --- Rich Group richness 11- 19 F9.5 deg RAdeg Group centroid Right ascension in decimal degrees (J2000) 21- 29 F9.5 deg DEdeg Group centroid Declination in decimal degrees (J2000) 31- 37 F7.5 --- z Mean redshift of the group 39- 44 F6.2 km/s sigma Line-of-sight velocity dispersion of the group 46- 50 F5.2 Mpc Rad Virial radius of the group 52- 59 E8.3 solMass Mass Virial mass of the group 61- 65 F5.2 --- tcr Crossing time of the group, in units of 1/H0
Acknowledgements: Deng Xin-Fa,
(End) Patricia Vannier [CDS] 30-Aug-2007
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

catalogue service