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Title: A realistic assessment of the CTA sensitivity to dark matter annihilation

Abstract

We estimate the sensitivity of the upcoming CTA gamma-ray observatory to DM annihilation at the Galactic centre, improving on previous analyses in a number of significant ways. First, we perform a detailed analyses of all backgrounds, including diffuse astrophysical emission for the first time in a study of this type. Second, we present a statistical framework for including systematic errors and estimate the consequent degradation in sensitivity. These errors may come from e.g. event reconstruction, Monte Carlo determination of the effective area or uncertainty in atmospheric conditions. Third, we show that performing the analysis on a set of suitably optimised regions of interest makes it possible to partially compensate for the degradation in sensitivity caused by systematics and diffuse emission. To probe dark matter with the canonical thermal annihilation cross-section, CTA systematics like non-uniform variations in acceptance over a single field of view must be kept below the 0.3% level, unless the dark matter density rises more steeply in the centre of the Galaxy than predicted by a typical Navarro-Frenk-White or Einasto profile. For a contracted r{sup −1.3} profile, and systematics at the 1% level, CTA can probe annihilation to b b-bar at the canonical thermal level for dark mattermore » masses between 100 GeV and 10 TeV.« less

Authors:
; ;  [1];  [2]
  1. GRAPPA, University of Amsterdam, Science Park 904, Amsterdam, 1098 XH The Netherlands (Netherlands)
  2. Department of Physics, Imperial College London, Blackett Laboratory, Prince Consort Road, London, SW7 2AZ United Kingdom (United Kingdom)
Publication Date:
OSTI Identifier:
22525918
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; ASTROPHYSICS; DENSITY; GALAXIES; GAMMA RADIATION; GEV RANGE; MASS; MILKY WAY; MONTE CARLO METHOD; NONLUMINOUS MATTER; PROBES; SENSITIVITY; TEV RANGE; VARIATIONS

Citation Formats

Silverwood, Hamish, Weniger, Christoph, Bertone, Gianfranco, and Scott, Pat, E-mail: h.g.m.silverwood@uva.nl, E-mail: c.weniger@uva.nl, E-mail: p.scott@imperial.ac.uk, E-mail: gf.bertone@gmail.com. A realistic assessment of the CTA sensitivity to dark matter annihilation. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/03/055.
Silverwood, Hamish, Weniger, Christoph, Bertone, Gianfranco, & Scott, Pat, E-mail: h.g.m.silverwood@uva.nl, E-mail: c.weniger@uva.nl, E-mail: p.scott@imperial.ac.uk, E-mail: gf.bertone@gmail.com. A realistic assessment of the CTA sensitivity to dark matter annihilation. United States. doi:10.1088/1475-7516/2015/03/055.
Silverwood, Hamish, Weniger, Christoph, Bertone, Gianfranco, and Scott, Pat, E-mail: h.g.m.silverwood@uva.nl, E-mail: c.weniger@uva.nl, E-mail: p.scott@imperial.ac.uk, E-mail: gf.bertone@gmail.com. Sun . "A realistic assessment of the CTA sensitivity to dark matter annihilation". United States. doi:10.1088/1475-7516/2015/03/055.
@article{osti_22525918,
title = {A realistic assessment of the CTA sensitivity to dark matter annihilation},
author = {Silverwood, Hamish and Weniger, Christoph and Bertone, Gianfranco and Scott, Pat, E-mail: h.g.m.silverwood@uva.nl, E-mail: c.weniger@uva.nl, E-mail: p.scott@imperial.ac.uk, E-mail: gf.bertone@gmail.com},
abstractNote = {We estimate the sensitivity of the upcoming CTA gamma-ray observatory to DM annihilation at the Galactic centre, improving on previous analyses in a number of significant ways. First, we perform a detailed analyses of all backgrounds, including diffuse astrophysical emission for the first time in a study of this type. Second, we present a statistical framework for including systematic errors and estimate the consequent degradation in sensitivity. These errors may come from e.g. event reconstruction, Monte Carlo determination of the effective area or uncertainty in atmospheric conditions. Third, we show that performing the analysis on a set of suitably optimised regions of interest makes it possible to partially compensate for the degradation in sensitivity caused by systematics and diffuse emission. To probe dark matter with the canonical thermal annihilation cross-section, CTA systematics like non-uniform variations in acceptance over a single field of view must be kept below the 0.3% level, unless the dark matter density rises more steeply in the centre of the Galaxy than predicted by a typical Navarro-Frenk-White or Einasto profile. For a contracted r{sup −1.3} profile, and systematics at the 1% level, CTA can probe annihilation to b b-bar at the canonical thermal level for dark matter masses between 100 GeV and 10 TeV.},
doi = {10.1088/1475-7516/2015/03/055},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 03,
volume = 2015,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}