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Dwarf spheroidal J-factors without priors: A likelihood-based analysis for indirect dark matter searches
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 6
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 466, no 1, 669-676 p.Article in journal (Refereed) Published
Abstract [en]

Line-of-sight integrals of the squared density, commonly called the J-factor, are essential for inferring dark matter (DM) annihilation signals. The J-factors of DM-dominated dwarf spheroidal satellite galaxies (dSphs) have typically been derived using Bayesian techniques, which for small data samples implies that a choice of priors constitutes a non-negligible systematic uncertainty. Here we report the development of a new fully frequentist approach to construct the profile likelihood of the J-factor. Using stellar kinematic data from several classical and ultra-faint dSphs, we derive the maximum likelihood value for the J-factor and its confidence intervals. We validate this method, in particular its bias and coverage, using simulated data from the Gaia Challenge. We find that the method possesses good statistical properties. The J-factors and their uncertainties are generally in good agreement with the Bayesian-derived values, with the largest deviations restricted to the systems with the smallest kinematic data sets. We discuss improvements, extensions, and future applications of this technique.

Place, publisher, year, edition, pages
2017. Vol. 466, no 1, 669-676 p.
Keyword [en]
galaxies: dwarf, galaxies: kinematics and dynamics, dark matter
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-142610DOI: 10.1093/mnras/stw3079ISI: 000398112400046OAI: oai:DiVA.org:su-142610DiVA: diva2:1097288
Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-05-22Bibliographically approved

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Chiappo, AndreaConrad, JanAnderson, BrandonSánchez-Conde, Miguel A.
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CiteExportLink to record
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Citation style
  • apa
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  • modern-language-association-8th-edition
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