Chandra Bulge Field: X-Ray Point Source Catalog for Galactic Ridge Emission

The Chandra bulge field observations target the central quarter of the Galactic Plane. The catalog contains 2596 X-ray point source candidates from ~900 ks of total exposure time using the Chandra ACIS-I instrument, retrieved from 10 archived data sets taken between May and August 2008. The analysis aims to constrain the nature of these sources and their contribution to the Galactic Ridge X-ray emission in the hard band.

Use Cases

• Classifying X-ray point sources based on their spectral properties (hard, soft and broad, soft and peaked) as described in the analysis.
• Modeling the log N - log S curve in the 2-8 keV band to understand source population dominance across flux ranges.
• Investigating the origin of Fe K-alpha line emission from thermal white dwarf binaries and X-ray active stars.
• Validating point source detection algorithms by comparing candidate counts with prior studies in the same region.

Strengths

• Contains 2596 source candidates identified with a low false-positive detection threshold of 2.5 x 10^-5.
• Based on deep observations with a total exposure time of approximately 900 kiloseconds.
• Sources are classified into three groups (A, B, C) and further decomposed spectrally, providing a structured analysis framework.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for specific analytical tasks.
• Data was last updated 2026-03-13 19:00:40.277415; freshness should be verified for current research.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Point sources extracted using the wavdetect algorithm in the CIAO package from 10 archived Chandra ACIS-I observations.

Time Range

Observations carried out from 2008 May to August.

Freshness

Last updated 2026-03-13 19:00:40.277415

Geography

Central quarter of the Galactic Plane (Galactic bulge field).