CDFN 2-Megasecond: Optical and Infrared Catalog for 503 X-ray Sources

The Chandra Deep Field North 2-Megasecond Optical and IR Catalog from NASA HEASARC provides multicolor imaging for 503 X-ray point sources and spectroscopic redshifts for 284 sources. It includes six high-redshift type II quasars and shows that 68% of the measured 2-8 keV light arises from sources at redshift less than 2. The optical imaging data consist of Johnson B, V, Cousins R, I, and Sloan z' observations from the Subaru telescope in 2001 and 2002.

Use Cases

• Analyze the correlation between X-ray emission and optical/IR properties based on the multicolor imaging data.
• Study the redshift distribution and evolution of X-ray sources based on the 284 spectroscopic redshifts.
• Identify and characterize high-redshift type II quasars based on the six spectroscopically identified examples.
• Investigate the contribution of sources at different redshifts to the X-ray background based on the light distribution statistics.

Strengths

• Includes spectroscopic redshifts for 284 of the 503 X-ray sources.
• Achieves 87% spectroscopic completeness for sources with R magnitude <= 24.
• Contains high-quality multicolor imaging data (B, V, R, I, z') for all sources.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Optical and near-infrared catalog created from Subaru telescope imaging and spectroscopic follow-up of X-ray sources identified in Chandra observations.

Time Range

Optical observations from February-April 2001 and 2002.

Freshness

Last updated 2026-03-13 17:48:51.784852; freshness should be verified.

Geography

Covers the Hubble Deep Field North region.