ROSAT NEP Survey: 219 X-ray Flux-Limited Active Galactic Nuclei
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Description
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.
License is listed as 'other-license-specified'; terms should be reviewed before use.