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

Journal Article · Sat Feb 01 00:00:00 EST 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/02/008· OSTI ID:22369775

Aleksić, J.; Blanch, O. ^[1]; Ansoldi, S. ^[2]; Antonelli, L. A.; Bonnoli, G. ^[3]; Antoranz, P. ^[4]; Babic, A. ^[5]; Bangale, P.; De Almeida, U. Barres; Bock, R. K.; Borracci, F. ^[6]; Barrio, J. A.; Bonnefoy, S. ^[7]; González, J. Becerra; Berger, K. ^[8]; Bednarek, W. ^[9]; Bernardini, E. ^[10]; Biland, A. ^[11]; Bretz, T. ^[12]; others, and

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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)
5. Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb (Croatia)
6. Max-Planck-Institut für Physik, D-80805 München (Germany)
7. Universidad Complutense, E-28040 Madrid (Spain)
8. Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife (Spain)
9. University of Łódź, PL-90236 Lodz (Poland)
10. Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen (Germany)
11. ETH Zurich, CH-8093 Zurich (Switzerland)
12. Universität Würzburg, D-97074 Würzburg (Germany)

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.

• OSTI ID: 22369775
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANNIHILATION
CROSS SECTIONS
GALAXIES
GAMMA RADIATION
GEV RANGE 100-1000
GEV RANGE 10-100
INTERNAL BREMSSTRAHLUNG
MONOCHROMATIC RADIATION
NONLUMINOUS MATTER
PARTICLE DECAY
STANDARD MODEL
TEV RANGE 01-10
TEV RANGE 10-100