Published January 26, 2023 | Version 0.1.0
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Data files for Constraints on axionlike particles from a combined analysis of three flaring Fermi flat-spectrum radio quasars

  • 1. Oxford University
  • 2. University of Southern Denmark

Description

In this repository, we provide data files in connection to our publication “Constraints on axionlike particles from a combined analysis of three flaring Fermi flat-spectrum radio quasars” submitted for publication in Physical Review D and available on the Arxiv: https://arxiv.org/abs/2211.03414


In the paper, we analyze data from the Fermi Large Area Telescope (LAT) of three flat spectrum radio quasars (FSRQs): 3C454.3, 3C279, and CTA102, to search for signatures of oscillations between photons and axion-like particles (ALPs).
In this repository, we provide the following data:

  • Files ending on *_data_seds.npy contain the spectral energy distributions (SEDs) measured with the Fermi LAT and extracted using the fermipy software
  • Files ending on *_LLs.npy contain the log-likelihood values of our fits over a grid of ALP masses and photon-ALP couplings
  • Files ending on *_Lambdas.npy contain the log-likelihood ratio test values of our fits over a grid of ALP masses and photon-ALP couplings
  • Files ending on *_LL_thresh.npy contain the threshold values for the log-likelihood ratio test for which we can claim an exclusion at the 95% confidence level over a grid of ALP masses and photon-ALP couplings
  • Files ending on*_contours.npy contain the upper limit contours.

Files starting with "ALL" contain the likelihoods combined over all sources

We also provide a minimal jupyter notebook, analysis_arrays.ipynb, that demonstrates how to read in the files.

Files

analysis_arrays.ipynb

Files (17.4 MB)

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md5:79f9bdf444bcf77cd72eb76ebdc24c8e
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md5:bc629dd4ce0defc85973de5881bec32a
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md5:5cf1b659dc9f59f3e41b2d5e7090e475
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md5:afa4c1601c523994ce5551eb263925cd
4.5 MB Download

Additional details

Funding

AxionDM – Searching for axion and axion-like-particle dark matter in the laboratory and with high-energy astrophysical observations 948689
European Commission