Fermi LAT Quasar Data for Axion-Like Particle Constraints

University of Oxford researchers provide data files supporting a publication on axion-like particle constraints. The data includes spectral energy distributions and log-likelihood values from Fermi Large Area Telescope observations of three flaring flat-spectrum radio quasars: 3C454.3, 3C279, and CTA102. The associated paper is submitted to Physical Review D and available on arXiv.

Use Cases

• Constraining axion-like particle mass and coupling parameters based on spectral energy distribution data.
• Performing log-likelihood ratio tests for photon-ALP oscillation signatures based on the provided likelihood grids.
• Calculating exclusion contours at 95% confidence levels using the provided threshold values.
• Combining likelihood analyses across multiple astronomical sources using the aggregated 'ALL' files.

Strengths

• Data is directly connected to a peer-reviewed submission to Physical Review D, indicating a research-grade source.
• Includes combined analysis results from three distinct astronomical sources (3C454.3, 3C279, and CTA102).
• Provides a Jupyter notebook (analysis_arrays.ipynb) demonstrating how to read the data files.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and overall dataset size are unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

University of Oxford, associated with the arXiv preprint 2211.03414.

Collection Method

Data extracted from Fermi Large Area Telescope observations using the fermipy software.