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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 75 109 Cluster characteristics
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See also:
http://www.sdss.org : SDSS Home Page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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Acknowledgements: Alfonso Aguerri, jalfonso(at)iac.es
(End) Patricia Vannier [CDS] 02-Jul-2007