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J/A+A/471/17        SDSS-DR4 nearby clusters global properties (Aguerri+, 2007)

A study of catalogued nearby clusters in the SDSS-DR4. I. Cluster global properties. Aguerri J.A.L., Sanchez-Janssen R., Munoz-Tunon C. <Astron. Astrophys. 470, 17 (2007)> =2007A&A...471...17A
ADC_Keywords: Surveys ; Clusters, galaxy ; Radial velocities ; Velocity dispersion Keywords: galaxies: clusters: general Abstract: Large surveys such as the Sloan Digital Sky Survey have made large amounts of spectroscopic and photometric data of galaxies available, thereby providing important information for studying galaxy evolution in dense environments. We have selected a sample of 88 nearby (z<0.1) galaxy clusters from the SDSS-DR4 with redshift information for the cluster members. In particular, we focus on the galaxy morphological distribution, the velocity dispersion profiles, and the fraction of blue galaxies in clusters. Cluster membership was determined using the available velocity information. We derived global properties for each cluster, such as their mean recessional velocity, velocity dispersion, and virial radii. Cluster galaxies were grouped into two families according to their u-r colours. Description: This table shows the main Cluster characteristics File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 75 109 Cluster characteristics
See also: : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 17 A17 --- Name Cluster Name 19- 27 F9.5 deg RAdeg Right ascension (J2000) 29- 37 F9.5 deg DEdeg Declination (J2000) 39- 43 I5 km/s Vmean Mean cluster velocity 45- 47 I3 km/s E_Vmean Mean cluster velocity upper error 49- 50 I2 km/s e_Vmean Mean cluster velocity lower error 52- 54 I3 km/s sigma Cluster velocity dispersion 56- 58 I3 km/s E_sigma Velocity dispersion upper error 60- 61 I2 km/s e_sigma Velocity dispersion lower error 63- 66 F4.2 --- Ngal Number of galaxies inside r200 68- 70 I3 Mpc r200 Radius r200 72- 75 F4.2 --- C Spectroscopical completeness in r200
Acknowledgements: Alfonso Aguerri, jalfonso(at)
(End) Patricia Vannier [CDS] 02-Jul-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

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