ChaMP: Chandra Multiwavelength X-Ray Point Source Catalog

6512 X-ray point sources detected in 130 Chandra observations from Cycles 1 and 2. The catalog was created by the Chandra Multiwavelength Project team and published in 2007, containing basic parameters, photometry, and fluxes for two assumed spectral energy distributions. This HEASARC table was created in October 2006 based on data from the ChaMP website.

Use Cases

• Cross-matching X-ray sources with optical counterparts based on the described typical positional offset of 0.7 arcseconds.
• Analyzing source reliability and detection probability for sources with counts greater than ~30.
• Studying X-ray spectral properties using photometric data in eight energy bands and hardness ratios.
• Investigating flux limits and sensitivity across fields with exposure times ranging from 0.9 to 124 ks.

Strengths

• Uniform data reduction and analysis with ChaMP-specific pipelines, validated by visual inspection.
• False source detection rate is approximately 1%, with detection probability better than ~95% for sources meeting specific criteria.
• Catalog sample is 7 times larger than the initial published ChaMP catalog from 2004.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• This table contains 6512 sources from 130 fields and excludes a supplementary catalog of 853 sources in 19 overlapping fields.

Provenance

Source

Chandra Multiwavelength Project (ChaMP) team, NASA HEASARC.

Collection Method

Data from Chandra X-ray Observatory observations, uniformly reduced and analyzed with ChaMP-specific pipelines.

Time Range

Observations from Chandra Cycles 1 and 2.

Freshness

Last updated 2026-03-13 17:52:29.388449; freshness should be verified.

Geography

Space-based observations covering approximately 10 square degrees.