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FSVSCLUSTR - Faint Sky Variability Survey Catalog of Galaxy Clusters and Rich Groups

HEASARC
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Overview

The Faint Sky Variability Survey Catalog of Galaxy Clusters and Rich Groups contains a a large sample of 598 galaxy clusters and rich groups discovered in the data of the Faint Sky Variability Survey (FSVS). The clusters have been identified using a fully automated, semi-parametric technique based on a maximum likelihood approach applied to Voronoi tessellation, and enhanced by color discrimination. The sample covers a wide range of richness, has a density of ~28 clusters per square degree, and spans a range of estimated redshifts of 0.05 < z < 0.9 with mean <z> = 0.345. Assuming the presence of a cluster red sequence, the uncertainty of the estimated cluster redshifts is assessed to be sigma ~ 0.03. Containing over 100 clusters with z > 0.6, the catalog contributes substantially to the current total of optically-selected, intermediate-redshift clusters, and complements the existing, usually X-ray selected, samples. The FSVS fields are accessible for observation throughout the whole year, making them particularly suited for large follow-up programs. The construction of this FSVS Cluster Catalogue completes a fundamental component of the authors' continuing program to investigate the environments of quasars and the chemical evolution of galaxies. The present table contains the list of all clusters with their basic parameters.

Catalog Bibcode

2006MNRAS.369.1334S

References

The FSVS Cluster Catalogue: galaxy clusters and groups in the Faint Sky
Variability Survey
     Soechting I.K., Huber M.E., Clowes R.G., Howell S.B.
    <Monthly Notices of the Royal Astronomical Society 369, 1334 (2006)>
    =2006MNRAS.369.1334S

Provenance

This table was created by the HEASARC in July 2006 based on the table cluster_catalogue.txt copied from the first author's web site http://www-astro.physics.ox.ac.uk/~iks/FSVScatalogue/home.html

Parameters

FSVS_Field
The number of the FSVS field in which the cluster was detected.

Name
The identification of the cluster, formed from the survey name (FSVSCL) and the J2000 coordinates.

RA
The Right Ascension of the cluster center in the selected equinox. This corresponds to the mean position of its members. The RA was given in J2000 coordinates to a precision of 1 second of time in the original table.

Dec
The Declination of the cluster center in the selected equinox. This corresponds to the mean position of its members. The declination was given in J2000 coordinates to a precision of 1 arcsecond in the original table.

LII
The Galactic Longitude of the cluster center.

BII
The Galactic Latitude of the cluster center.

Number_Members
The number of member galaxies, defined as the number of all objects found within the boundary of the cluster and falling within the color-magnitude filter in which the cluster has been detected.

Number_All
The number of all objects contained within the cluster boundary.

Cluster_Area
The area occupied by the cluster, in arcmin^2.

Cluster_Density
The projected number density of member galaxies, in arcmin^-2.

Imag_Brightest
The apparent I magnitude of the brightest cluster galaxy.

Imag_3rd_Brightest
The apparent I magnitude of the third brightest member galaxy in the cluster, m_3.

VI_Color_Max
The maximum color of the color-magnitude filter in which the cluster has been detected.

Richness
The richness of the cluster, defined as the number of galaxies found within its spatial boundary, its color filter, and the magnitude range between m_3 < I < m_3 + 2, where m_3 is the magnitude of the 3rd brightest cluster member.

Richness_Flag
This parameter is a flag which is set to 1 to indicate that the richness is underestimated because of a restricted magnitude range.

Redshift
The estimated redshift of the cluster.

Field_Boundary_Flag
This parameter is a flag which is set to 1 to indicate that the cluster parameters may possibly have been influenced by the field boundary.

CRS_Chi_Squared
The minimized value of the chi-squared parameter defined by equation (10) in the published paper, the cluster red sequence (CRS) chi-squared parameter, Chi_CRS^2.

CRS_Probability
The CRS probability defined as P_CRS = Pr (Chi^2 < Chi_CRS^2) for a chi-squared distribution with (n-3) degrees of freedom, where n is the number of cluster members.


Contact Person

Questions regarding the FSVSCLUSTR database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 25-Jul-2006