NPTFit: A code package for Non-Poissonian Template Fitting

Abstract

We present NPTFit, an open-source code package, written in python and cython, for performing non-Poissonian template fits (NPTFs). The NPTF is a recently-developed statistical procedure for characterizing the contribution of unresolved point sources (PSs) to astrophysical data sets. The NPTF was first applied to Fermi gamma-ray data to give evidence that the excess of ~GeV gamma-rays observed in the inner regions of the Milky Way likely arises from a population of sub-threshold point sources, and the NPTF has since found additional applications studying sub-threshold extragalactic sources at high Galactic latitudes. The NPTF generalizes traditional astrophysical template fits to allow for the ability to search for populations of unresolved PSs that may follow a given spatial distribution. NPTFit builds upon the framework of the fluctuation analyses developed in X-ray astronomy, and thus likely has applications beyond those demonstrated with gamma-ray data. The NPTFit package utilizes novel computational methods to perform the NPTF efficiently. The code is available at https://github.com/bsafdi/NPTFit and up-to-date and extensive documentation may be found at http://nptfit.readthedocs.io

18 pages, 4 figure; v2, AJ version; with accompanying code at https://github.com/bsafdi/NPTFit

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• Diffuse gamma-ray emission from galactic pulsars
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Cited by in corpus (26)

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• A Search for Dark Matter Annihilation in Galaxy Groups
• The Enigmatic Galactic Center Excess: Spurious Point Sources and Signal Mismodeling
• Characterizing the Nature of the Unresolved Point Sources in the Galactic Center
• The GCE in a New Light: Disentangling the $\gamma$-ray Sky with Bayesian Graph Convolutional Neural Networks
• Mapping Extragalactic Dark Matter Annihilation with Galaxy Surveys: A Systematic Study of Stacked Group Searches
• A Search for Dark Matter Annihilation in the Milky Way Halo
• A neural simulation-based inference approach for characterizing the Galactic Center $\gamma$-ray excess
• Dissecting the inner Galaxy with $\gamma$-ray pixel count statistics
• Les Houches Lectures on Indirect Detection of Dark Matter
• Gamma-ray and X-ray emission from the Galactic Centre: hints on the nuclear star cluster formation history
• Dim but not entirely dark: Extracting the Galactic Center Excess' source-count distribution with neural nets
• Testing gamma-ray models of blazars in the extragalactic sky
• Luminosity functions consistent with a pulsar-dominated Galactic Center Excess
• Inverse Compton emission from millisecond pulsars in the Galactic bulge
• A Compound Poisson Generator approach to Point-Source Inference in Astrophysics
• What the Milky Way's Dwarfs tell us about the Galactic Center extended excess
• A Search for Neutrino Point-Source Populations in 7 Years of IceCube Data with Neutrino-count Statistics
• Harnessing the Population Statistics of Subhalos to Search for Annihilating Dark Matter
• Multi-Component Imaging of the Fermi Gamma-ray Sky in the Spatio-spectral Domain
• Testing the ABS method with the simulated Planck temperature maps
• Extracting the gamma-ray source-count distribution below the Fermi-LAT detection limit with deep learning
• Characterizing the Expected Behavior of Non-Poissonian Template Fitting
• On the Energy Distribution of the Galactic Center Excess' Sources