Eta Chamaeleontis eROSITA Hard X-Ray Source Catalog

A 150 ks observation by the eROSITA telescope during its CalPV phase produced this catalog of X-ray sources in the hard 2.3-5.0 keV band. The data, taken in a field-scan mode covering a 5x5 degree area, were used to study the young open cluster eta Chamaeleontis, identify new members via cross-matching with Gaia and 2MASS, and analyze X-ray luminosities and spectra. The HEASARC ingested this table in August 2022 from the eROSITA-DE Early Data Release.

Use Cases

• Identify new low-mass stellar members of the eta Chamaeleontis cluster based on X-ray activity and kinematic properties.
• Cross-match X-ray sources with optical and infrared catalogs (Gaia, 2MASS) for multi-wavelength analysis.
• Study X-ray luminosity functions and spectral properties of young cluster members.
• Analyze the spatial distribution of cluster members to infer population dynamics and ejected halo stars.
• Compare X-ray light curves and properties with previous observational data for temporal variability studies.

Strengths

• Data originates from the eROSITA/SRG space telescope, a modern X-ray observatory.
• Observation used a specific 150 ks exposure in a calibrated field-scan mode.
• Sources were identified using cross-matching with authoritative catalogs (Gaia, 2MASS).
• Analysis supported the identification of at least 23 cluster members, including five new candidate systems.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale statistical tasks.
• The catalog is specific to the hard X-ray band (2.3-5.0 keV); a separate catalog exists for the main band (0.2-2.3 keV).

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC), based on eROSITA-DE Early Data Release.

Collection Method

X-ray observations from the eROSITA telescope on the Spectrum-Roentgen-Gamma (SRG) mission, processed and cross-matched with Gaia and 2MASS.

Time Range

Observation corresponds to OBSID 300004 (specific date not provided).

Freshness

Last updated 2026-03-13 19:16:39.810361; freshness should be verified.

Geography

Covers the eta Chamaeleontis young open cluster region in a 5x5 degree field of the sky.