FSVSCLUSTR - Faint Sky Variability Survey Catalog of Galaxy Clusters and Rich Groups
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.
The FSVS Cluster Catalogue: galaxy clusters and groups in the Faint Sky
Soechting I.K., Huber M.E., Clowes R.G., Howell S.B.
<Monthly Notices of the Royal Astronomical Society 369, 1334 (2006)>
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
The number of the FSVS field in which the cluster was detected.
The identification of the cluster, formed from the survey name
(FSVSCL) and the J2000 coordinates.
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.
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.
The Galactic Longitude of the cluster center.
The Galactic Latitude of the cluster center.
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.
The number of all objects contained within the cluster boundary.
The area occupied by the cluster, in arcmin^2.
The projected number density of member galaxies, in
The apparent I magnitude of the brightest cluster galaxy.
The apparent I magnitude of the third brightest member
galaxy in the cluster, m_3.
The maximum color of the color-magnitude filter in which the
cluster has been detected.
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
This parameter is a flag which is set to 1 to indicate that
the richness is underestimated because of a restricted magnitude range.
The estimated redshift of the cluster.
This parameter is a flag which is set to 1 to indicate
that the cluster parameters may possibly have been influenced by the field
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.
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.
Questions regarding the FSVSCLUSTR database table can be addressed to the
HEASARC User Hotline.
If you have any problems, please consult the help
page or mail email@example.com