2XMMi/SDSS: X-ray Selected Galaxy Clusters with Optical Confirmation
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Description
The 2XMMi/SDSS Galaxy Cluster Survey is a catalog of 530 X-ray-selected galaxy groups and clusters compiled by cross-matching the XMM-Newton Serendipitous Source Catalog with optical data from the Sloan Digital Sky Survey. The catalog, hosted by NASA, provides photometric and spectroscopic redshifts, X-ray fluxes, luminosities, temperatures, and cluster mass estimates. It includes 345 clusters with spectroscopic X-ray parameters and 185 with catalog-derived fluxes, superseding a previous release of 175 clusters.
Use Cases
Analyzing the X-ray luminosity-temperature (L_X - T) relation based on the derived spectroscopic parameters.
Studying galaxy cluster evolution across a redshift range based on the provided redshifts from 0.03 to 0.70.
Identifying new X-ray and optical cluster discoveries based on the catalog's classification of new vs. known systems.
Estimating cluster mass at R_500 based on the provided scaling relations.
Cross-matching X-ray and optical sources for multi-wavelength confirmation based on the survey's methodology.
Strengths
530 optically confirmed galaxy clusters, with 310 having at least one spectroscopic redshift.
345 clusters have X-ray spectroscopic temperature and flux from spectral fitting.
Spans a wide redshift range from 0.03 to 0.70, with a median of 0.32.
About 75% of the optically confirmed sample are newly discovered X-ray clusters.
Limitations
Row count and column-level documentation are unknown, which may limit suitability assessment.
The catalog is split into two subsamples with different data quality (spectroscopic fits vs. catalog fluxes).
Description metadata is limited; actual data quality requires manual inspection after download.
Provenance
Source
National Aeronautics and Space Administration (NASA)
Collection Method
Compiled by cross-matching the XMM-Newton Serendipitous Source Catalog (2XMMi-DR3) with optical data from the Sloan Digital Sky Survey (SDSS-DR7), using a finding algorithm for galaxy overdensities.
Time Range
Observation dates are not specified; the catalog represents a snapshot from the 2XMMi-DR3 and SDSS-DR7 releases.
Freshness
Last updated 2026-03-13 18:14:53.624245; freshness should be verified.
Geography
Sky coverage is limited to the footprint of the SDSS-DR7 survey.
License is listed as 'other-license-specified'; specific terms must be checked before use. File formats include BIN and HTML, which may require specialized tools for access.