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Last modified: 18 August 2026

URL: https://cxc.cfa.harvard.edu/csc/csc_crossmatches-prelim.html
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CSC Preliminary Crossmatches

CSC 2.1 Crossmatches | CSC 2.0 Crossmatches

PRELIMINARY CSC 2.1 Database Crossmatches for SDSS-V Target Selection and SDSS Spectra

Using the NWAY algorithm, we have crossmatched the X-ray sources extracted from the CSC 2.1 production database on 14 November 2022 (389k sources) to four optical and near-IR catalogs—Gaia DR3, Legacy Survey DR10, PanSTARRS-1, and 2MASS— finding counterparts for 229k sources. The resulting matched catalog lists a subset of X-ray information, catalog IDs, positions, and magnitudes for all optical/IR matches. Cross-matching this table with SDSS DR17 spectroscopy yields about 17k objects for which SDSS spectra, classifications, and radial velocities are given. We present a README file describing the catalog, and the cross-match catalog itself in FITS and CSV format.

A crossmatched table of 188k sources has been submitted to the SDSS-V project as potential targets for spectroscopy.

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