ROSAT-6dFGS: Catalog of 3,405 X-Ray Selected AGN with Optical Spectra

NASA HEASARC provides a catalog of 3,405 X-ray sources from the ROSAT All Sky Survey within the 6dF Galaxy Survey area. The catalog includes optical spectra for 2,224 sources, with reliable redshifts for 1,715 objects, primarily quasi-stellar objects and active galaxies. This table was created in April 2010 based on the reference paper.

Use Cases

• Classifying AGN types (e.g., type 1 vs. type 2) based on optical spectra and redshift data.
• Investigating the correlation between X-ray flux and radio detection rates mentioned in the description.
• Analyzing the redshift distribution and median redshift (z = 0.16) of X-ray selected AGN.
• Identifying optically faint, low-redshift compact objects that deviate from general trends.
• Comparing Southern hemisphere sources with Northern hemisphere samples like the RBSC-NVSS.

Strengths

• Contains 3,405 X-ray sources with a defined count-rate limit of 0.05 ct s⁻¹.
• Includes optical spectra for 2,224 sources (65% of the sample) and reliable redshifts for 1,715.
• Provides a large set of homogeneous optical spectra ideal for comparative studies of AGN.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to the survey area (Declination < 0 degrees, |b| > 10 degrees).

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Created based on an electronic version of Table 3 from the reference paper obtained from the MNRAS web site.

Time Range

null

Freshness

Last updated 2026-03-13 18:25:56.494378; freshness should be verified.

Geography

Sky area with Declination < 0 degrees and Galactic latitude |b| > 10 degrees.