LALA Cetus Field: Chandra X-Ray Point Source Catalog with Optical IDs

188 X-ray sources were detected in the LALA Cetus field by a 174 ks Chandra ACIS exposure, with 154 having optical counterparts identified down to r' = 25.9 magnitude. The weighted stacked spectrum of the sources has a photon index of Gamma = 1.55, and the resolved fraction of the X-ray background drops from 72% at 0.5-1.0 keV to 63% at 6.0-8.0 keV. This catalog was created by NASA HEASARC in October 2010 based on published research.

Use Cases

• Compare X-ray source counts and densities between different deep fields based on the provided band-specific detections.
• Analyze the spectral properties of faint X-ray sources using the power-law fit parameters for the stacked spectrum.
• Cross-match X-ray sources with optical catalogs for multi-wavelength identification based on the 154 presented counterparts.
• Study the resolved and unresolved components of the X-ray background across different energy bands.

Strengths

• Provides detection counts for three specific energy bands: 174 in 0.5-7.0 keV, 154 in 0.5-2.0 keV, and 113 in 2.0-7.0 keV.
• Includes optical identifications for 154 sources with a deep limiting magnitude of r' = 25.9.
• Contains derived spectral analysis, including a power-law photon index of Gamma = 1.55 for the stacked source spectrum.

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 temporal and instrumental bias inherent to the specific Chandra observation.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Created based on the CDS table J/ApJ/669/765 file table1.dat from published research analyzing Chandra ACIS observations.

Freshness

Last updated 2026-03-13 18:33:13.463276; freshness should be verified.

Geography

Covers the Large Area Lyman Alpha Survey (LALA) Cetus field, an extragalactic deep field.