U.S. Department of EnergyOffice of Scientific and Technical Information
Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array
Abstract
We derive the Cherenkov Telescope Array (CTA) sensitivity to dark matter (DM) annihilation in several primary channels, over a broad range of DM masses. These sensitivities are estimated when CTA is pointed towards a large sample of Milky Way's dwarf spheroidal galaxies (dSphs) with promising J -factors and small statistical uncertainties. This analysis neglects systematic uncertainties, which we estimate at the level of at least 1 dex. We also present sensitivities on the annihilation cross section from a combined analysis of 4 dSphs. We assess the CTA sensitivity by: i ) using, for each dSph, a recent determination of the J -factor and its statistical error; ii ) considering the most up-to-date cosmic ray background; and iii ) including both spatial and spectral terms in the likelihood analysis. We find that a joint spectral and spatial analysis improves the CTA sensitivity, in particular for primary channels with sharp features in the γ-ray energy spectrum and for dSphs with steep J -factor profiles, as deduced from the internal kinematics. The greatest sensitivities are obtained for observations of Ursa Minor among the classical dSphs and of Ursa Major II for ultra-faint dSphs.
- Authors:
-
- IRFU/DSM, CEA Saclay, F-91191 Gif-sur-Yvette (France)
- Institut d'Astrophysique de Paris, UMR 7095 (CNRS and UPMC, Sorbonne Universités), 98 bis Boulevard Arago, Paris F-75014 (France)
- Publication Date:
- OSTI Identifier:
- 22679465
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2016; Journal Issue: 09; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; CHERENKOV COUNTERS; COSMIC RADIATION; CROSS SECTIONS; ENERGY SPECTRA; GAMMA RADIATION; MASS; MILKY WAY; NONLUMINOUS MATTER; SENSITIVITY; TELESCOPES
Citation Formats
Lefranc, Valentin, Mamon, Gary A., and Panci, Paolo. Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array. United States: N. p., 2016.
Web. doi:10.1088/1475-7516/2016/09/021.
Lefranc, Valentin, Mamon, Gary A., & Panci, Paolo. Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array. United States. https://doi.org/10.1088/1475-7516/2016/09/021
Lefranc, Valentin, Mamon, Gary A., and Panci, Paolo. 2016.
"Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array". United States. https://doi.org/10.1088/1475-7516/2016/09/021.
@article{osti_22679465,
title = {Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array},
author = {Lefranc, Valentin and Mamon, Gary A. and Panci, Paolo},
abstractNote = {We derive the Cherenkov Telescope Array (CTA) sensitivity to dark matter (DM) annihilation in several primary channels, over a broad range of DM masses. These sensitivities are estimated when CTA is pointed towards a large sample of Milky Way's dwarf spheroidal galaxies (dSphs) with promising J -factors and small statistical uncertainties. This analysis neglects systematic uncertainties, which we estimate at the level of at least 1 dex. We also present sensitivities on the annihilation cross section from a combined analysis of 4 dSphs. We assess the CTA sensitivity by: i ) using, for each dSph, a recent determination of the J -factor and its statistical error; ii ) considering the most up-to-date cosmic ray background; and iii ) including both spatial and spectral terms in the likelihood analysis. We find that a joint spectral and spatial analysis improves the CTA sensitivity, in particular for primary channels with sharp features in the γ-ray energy spectrum and for dSphs with steep J -factor profiles, as deduced from the internal kinematics. The greatest sensitivities are obtained for observations of Ursa Minor among the classical dSphs and of Ursa Major II for ultra-faint dSphs.},
doi = {10.1088/1475-7516/2016/09/021},
url = {https://www.osti.gov/biblio/22679465},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 09,
volume = 2016,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2016},
month = {Thu Sep 01 00:00:00 EDT 2016}
}
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