ROSAT Radio-Loud Quasars Catalog: 654 X-ray Detected Objects

Brinkmann et al. (1997) compiled a catalog of 654 quasars with measured radio emission detected by the ROSAT satellite. The data includes X-ray flux densities, power law indices, and radio-loudness classifications, with 69 objects classified as radio-quiet. This database was created by NASA's HEASARC in January 1999 based on the CDS/ADC Catalog J/A+A/319/413.

Use Cases

• Classifying quasars as radio-loud or radio-quiet based on the provided radio-loudness metric.
• Analyzing correlations between X-ray flux densities and radio emission in quasars.
• Studying the distribution of power law indices derived from ROSAT hardness ratios.
• Cross-matching and validating quasar catalogs using data from the Veron-Cetty & Veron catalog and ROSAT surveys.

Strengths

• Contains 654 distinct objects, providing a substantial sample for analysis.
• Includes multi-wavelength data, combining X-ray observations from ROSAT with 5GHz radio data from multiple surveys.
• Provides calculated X-ray flux densities and power law indices with associated error estimates.

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 16:37:04.543318; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS/ADC Catalog J/A+A/319/413.

Collection Method

Compiled from quasars in the Veron-Cetty & Veron catalog (1993) detected by ROSAT in its all-sky survey, pointed observations, or as serendipitous sources.

Freshness

Catalog created in 1999, based on observations from the 1990s.

Geography

All-sky survey data, implying global spatial coverage.