Einstein Survey: X-Ray Fluxes for 1018 Optically Selected Galaxies

A complete Einstein IPC X-ray survey of galaxies selected from the Shapley-Ames, Uppsala General, and ESO catalogs. The dataset contains X-ray detection and upper limit measurements for 1018 galaxies, with associated optical, redshift, and distance data for 827 of them. This database was created at the NASA HEASARC in May 2002 based on ADC/CDS catalog data.

Use Cases

• Correlating X-ray luminosity with optical galaxy properties based on the assembled optical and redshift data.
• Analyzing upper limits on X-ray flux for non-detected galaxies to constrain emission models.
• Comparing X-ray flux measurements with previous studies (e.g., Roberts et al. 1991, Fabbiano et al. 1992) for validation and trend analysis.
• Investigating distance-dependent relationships using the combined direct and model-predicted distance estimates.

Strengths

• Contains measurements for 1018 galaxies, providing a substantial sample size.
• X-ray flux accuracy is checked in three ways and reported as <= 0.1 dex.
• Includes associated optical, redshift, and distance data for 827 galaxies.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 17:29:22.804964; freshness should be verified.

Provenance

Source

NASA HEASARC, derived from ADC/CDS Catalog J/ApJS/111/163.

Collection Method

Results of a complete Einstein IPC X-ray survey of optically-selected galaxies from established catalogs.

Time Range

Based on data from a 2002 database creation, referencing studies from 1991 and 1992.

Freshness

Last updated 2026-03-13 17:29:22.804964.

Geography

Galaxies from the Shapley-Ames, Uppsala General Catalog (UGC), and European Southern Observatory (ESO) Catalog.