FSVSClusGR ivo://nasa.heasarc/fsvsclustr NASA/GSFC HEASARC Soechting et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Galaxy Cluster 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. This table was created by the HEASARC in July 2006 based on the table cluster_catalogue.txt copied from the first author's website <a href="https://web.archive.org/web/20100318044103/www-astro.physics.ox.ac.uk/~iks/FSVScatalogue/">https://web.archive.org/web/20100318044103/www-astro.physics.ox.ac.uk/~iks/FSVScatalogue/</a> (no longer available, unfortunately). Refer instead to <a href="https://cdsarc.unistra.fr/viz-bin/cat/J/MNRAS/369/1334">https://cdsarc.unistra.fr/viz-bin/cat/J/MNRAS/369/1334</a> for the data files and to <a href="https://www.noao.edu/survey-archives/fsvs/">https://www.noao.edu/survey-archives/fsvs/</a> for additional information about the survey. This is a service provided by NASA HEASARC . 2006MNRAS.369.1334S https://heasarc.gsfc.nasa.gov/W3Browse/all/fsvsclustr.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=fsvsclustr& GET text/xml 180 99999 true 159.2125 3.07277778 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=fsvsclustr GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_fsvsclustr&Action=More+Options&Action=Parameter+Search&ConeAdd=1 GALAXY CATALOG 0.0833333333333333 Optical public fsvsclustr Faint Sky Variability Survey Catalog of Galaxy Clusters and Rich name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable number_members Number of Member Galaxies short nullable cluster_area Area Occupied by the Cluster (arcmin^2) arcmin^2 double nullable redshift Estimated Redshift of the Cluster src.redshift double nullable vi_color_max Maximum Color of the Color-Magnitude Filter in Which the Cluster Was Detected mag double nullable field_boundary_flag Flag Indicates Cluster Parameters Possibly Influenced by Field Boundary short nullable richness Number of Member Galaxies with I Magnitude between m_3 and m_3 + 2 short nullable bii Galactic Latitude degree pos.galactic.lat double nullable cluster_density Projected Number Density of Member Galaxies (arcmin^-2) arcmin^-2 double nullable imag_brightest Apparent I Magnitude of the Brightest Member Galaxy of the Cluster mag double nullable lii Galactic Longitude degree pos.galactic.lon double nullable imag_3rd_brightest Apparent I Magnitude of the Third Brightest Member Galaxy of the Cluster, m_3 mag double nullable crs_probability Cluster Red Sequence (CRS) Probability Parameter double nullable crs_chi_squared Cluster Red Sequence (CRS) Minimized Chi-Squared Parameter double nullable number_all Number of All Objects Contained within the Cluster Boundary short nullable fsvs_field Number of the FSVS Field in Which the Cluster Was Detected short nullable richness_flag Flag Indicates Richness Underestimated Because of a Restricted Magnitude Range short nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable