SDSS/XMM-Newton Quasar Survey: 792 Quasars with Optical and X-ray Data

792 Sloan Digital Sky Survey quasars observed serendipitously in X-rays by the XMM-Newton satellite. The catalog covers a redshift range of z = 0.11 - 5.41 and includes 70 radio-loud and 51 broad absorption line quasars. This table was created by NASA's HEASARC in July 2009 based on data published in the Astrophysical Journal.

Use Cases

• Analyzing correlations between X-ray photon index and optical color based on the reported Gamma and Delta(g-i) relationship.
• Studying the prevalence of intrinsic absorption in quasars based on the 55 sources (11.6%) that prefer it.
• Investigating the relationship between X-ray luminosity and spectral slope using the reported correlation with Gamma.
• Comparing properties of radio-loud and broad absorption line quasars within a multi-wavelength sample.

Strengths

• Includes 792 quasars with matched optical spectra and X-ray observations.
• 87% of the sample (685 quasars) have significant X-ray detections at >=2 sigma.
• Provides derived physical parameters, including a weighted mean photon index Gamma = 1.91 +/- 0.08.
• Contains substantial numbers of specific quasar types: 70 radio-loud and 51 broad absorption line quasars.

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 16:35:44.142969; freshness should be verified.

Provenance

Source

NASA HEASARC, based on electronic versions of tables from an Astrophysical Journal paper.

Collection Method

Observational data from the Sloan Digital Sky Survey (DR5) and XMM-Newton satellite.

Freshness

Last updated 2026-03-13 16:35:44.142969