CYDER Survey: 267 X-Ray Sources with Optical Counterparts

267 X-ray sources detected by the Chandra observatory across five fields, focusing on an intermediate flux range (10^-15 to 10^-12 ergs/s). The catalog includes deep V and I band optical images, X-ray-to-optical flux ratios, and optical spectroscopy identifications with redshifts for 106 sources. This table was created by NASA's HEASARC in March 2007 based on published astronomical data.

Use Cases

• Analyze the log N - log S distribution of X-ray sources based on the survey's flux range.
• Study X-ray-to-optical flux ratios based on the deep V and I band images mentioned.
• Classify extragalactic sources and correlate properties with optical spectroscopic redshifts.
• Compare source populations and detection dependencies with deeper X-ray fields like the Chandra Deep Fields.

Strengths

• 267 detected X-ray sources provide a sample for statistical analysis.
• Optical spectroscopy from 8-meter class telescopes yielded identifications and redshifts for 106 sources.
• Data covers five distinct archived Chandra fields, offering spatial sampling.

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 20:01:23.536196; freshness should be verified.

Provenance

Source

National Aeronautics and Space Administration (NASA), HEASARC.

Collection Method

Serendipitous source detection from archived Chandra fields, supplemented by deep optical imaging and spectroscopy.

Time Range

null

Freshness

Last updated 2026-03-13 20:01:23.536196.

Geography

Extragalactic sky fields (five specific archived locations).