SWIRE/Chandra Lockman Hole Field: 775 X-Ray Sources with Multi-Wavelength Counterparts

775 X-ray sources detected in a moderate-depth Chandra survey covering 0.7 square degrees in the Lockman Hole Field. The catalog includes X-ray fluxes, hardness ratios, and multi-wavelength fluxes, with 99% of sources having infrared or optical counterparts. This table was created by NASA HEASARC in December 2009 based on data from the Astrophysical Journal.

Use Cases

• Classifying starburst galaxies and active galactic nuclei (AGNs) based on X-ray, infrared, and optical flux data.
• Analyzing the correlation between absorption and X-ray spectral hardness using hardness ratios and flux data.
• Investigating radio-loudness in AGNs using the 24-micron to radio flux ratio (q_24) as an indicator.
• Studying the spectral energy distributions of AGNs by plotting infrared versus X-ray fluxes for source selection.

Strengths

• High counterpart match rate: 771 (99%) of the 775 X-ray sources have infrared or optical counterparts.
• Multi-wavelength integration: includes data from Chandra, Spitzer, VLA, and optical surveys.
• 251 radio counterparts identified from very deep VLA data (~2.7 microJansky rms).

Limitations

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

Provenance

Source

NASA HEASARC, based on data from the Astrophysical Journal.

Collection Method

Created from machine-readable tables in a reference paper following a Chandra survey.

Time Range

Survey observation time is 70 ks (kiloseconds).

Freshness

Last updated 2026-03-13 17:58:00.601590; freshness should be verified.

Geography

Lockman Hole Field region of the sky.