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Title: Optimized dark matter searches in deep observations of Segue 1 with MAGIC

Abstract

We present the results of stereoscopic observations of the satellite galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours of good-quality data, this is the deepest observational campaign on any dwarf galaxy performed so far in the very high energy range of the electromagnetic spectrum. We search this large data sample for signals of dark matter particles in the mass range between 100 GeV and 20 TeV. For this we use the full likelihood analysis method, which provides optimal sensitivity to characteristic gamma-ray spectral features, like those expected from dark matter annihilation or decay. In particular, we focus our search on gamma-rays produced from different final state Standard Model particles, annihilation with internal bremsstrahlung, monochromatic lines and box-shaped signals. Our results represent the most stringent constraints to the annihilation cross-section or decay lifetime obtained from observations of satellite galaxies, for masses above few hundred GeV. In particular, our strongest limit (95% confidence level) corresponds to a ∼500 GeV dark matter particle annihilating into τ{sup +}τ{sup −}, and is of order <σ{sub ann}v>≃ 1.2×10{sup −24} cm{sup 3} s{sup −1} — a factor ∼40 above the <σ{sub ann}v>≃ thermal value.

Authors:
 [1];  [2];  [3];  [4];
  1. IFAE, Campus UAB, E-08193 Bellaterra (Spain)
  2. Università di Udine, and INFN Trieste, I-33100 Udine (Italy)
  3. INAF National Institute for Astrophysics, I-00136 Rome (Italy)
  4. Università di Siena, and INFN Pisa, I-53100 Siena (Italy)
Publication Date:
Sponsoring Org.:
SCOAP3, CERN, Geneva (Switzerland)
OSTI Identifier:
22454493
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2014; Journal Issue: 02; Other Information: PUBLISHER-ID: JCAP02(2014)008; OAI: oai:repo.scoap3.org:1265; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANNIHILATION; CROSS SECTIONS; DECAY; ELEMENTARY PARTICLES; GAMMA RADIATION; GAMMA SPECTRA; GEV RANGE; INTERNAL BREMSSTRAHLUNG; MONOCHROMATIC RADIATION; NONLUMINOUS MATTER; SATELLITES; STANDARD MODEL; TELESCOPES; TEV RANGE

Citation Formats

Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Collaboration: The The MAGIC Collaboration, and others, and. Optimized dark matter searches in deep observations of Segue 1 with MAGIC. United States: N. p., 2014. Web. doi:10.1088/1475-7516/2014/02/008.
Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Collaboration: The The MAGIC Collaboration, & others, and. Optimized dark matter searches in deep observations of Segue 1 with MAGIC. United States. https://doi.org/10.1088/1475-7516/2014/02/008
Aleksić, J., Ansoldi, S., Antonelli, L. A., Antoranz, P., Collaboration: The The MAGIC Collaboration, and others, and. 2014. "Optimized dark matter searches in deep observations of Segue 1 with MAGIC". United States. https://doi.org/10.1088/1475-7516/2014/02/008.
@article{osti_22454493,
title = {Optimized dark matter searches in deep observations of Segue 1 with MAGIC},
author = {Aleksić, J. and Ansoldi, S. and Antonelli, L. A. and Antoranz, P. and Collaboration: The The MAGIC Collaboration and others, and},
abstractNote = {We present the results of stereoscopic observations of the satellite galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours of good-quality data, this is the deepest observational campaign on any dwarf galaxy performed so far in the very high energy range of the electromagnetic spectrum. We search this large data sample for signals of dark matter particles in the mass range between 100 GeV and 20 TeV. For this we use the full likelihood analysis method, which provides optimal sensitivity to characteristic gamma-ray spectral features, like those expected from dark matter annihilation or decay. In particular, we focus our search on gamma-rays produced from different final state Standard Model particles, annihilation with internal bremsstrahlung, monochromatic lines and box-shaped signals. Our results represent the most stringent constraints to the annihilation cross-section or decay lifetime obtained from observations of satellite galaxies, for masses above few hundred GeV. In particular, our strongest limit (95% confidence level) corresponds to a ∼500 GeV dark matter particle annihilating into τ{sup +}τ{sup −}, and is of order <σ{sub ann}v>≃ 1.2×10{sup −24} cm{sup 3} s{sup −1} — a factor ∼40 above the <σ{sub ann}v>≃ thermal value.},
doi = {10.1088/1475-7516/2014/02/008},
url = {https://www.osti.gov/biblio/22454493}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 02,
volume = 2014,
place = {United States},
year = {Thu Feb 06 00:00:00 EST 2014},
month = {Thu Feb 06 00:00:00 EST 2014}
}