ROSAT NEP Survey: 219 X-ray Flux-Limited Active Galactic Nuclei

An 80.7 square degree region of the ROSAT North Ecliptic Pole Survey provides a catalog of 219 Active Galactic Nuclei (AGN). The catalog, created by NASA HEASARC in August 2005 and last updated in March 2026, features complete optical identifications and spectroscopic redshifts, with a median redshift of z = 0.41.

Use Cases

• Analyze the distribution and properties of unobscured Type 1 AGN based on the description stating they constitute 90% of the sample.
• Study X-ray luminosity and flux correlations for AGN based on the provided median values and corrected flux calculations.
• Benchmark cosmological models using the AGN sample based on the adoption of the 'concordance' cosmology for luminosity computations.
• Investigate AGN population statistics in a contiguous, flux-limited X-ray survey area based on the 80.7 square degree coverage.

Strengths

• Contains 219 AGN with complete optical identifications and spectroscopic redshifts.
• Features corrected flux and luminosity values, addressing a previous ~20% overestimation.
• Provides specific median values for redshift (z=0.41), X-ray flux, and X-ray luminosity.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is known (219), but the specific features and columns per row are unknown.
• Last updated 2026-03-13 18:36:25.471948; freshness should be verified.

Provenance

Source

NASA HEASARC, based on CDS table J/ApJ/617/192/table1.dat.

Collection Method

X-ray flux-limited sample from the ROSAT North Ecliptic Pole Survey.

Time Range

Survey data collection period not specified; catalog created August 2005.

Freshness

Last updated 2026-03 13 18:36:25.471948

Geography

Covers a contiguous 80.7 square degree region at the North Ecliptic Pole.