Upper limits on the VHE gamma-ray emission from the Willman 1 satellite galaxy with the Magic telescope



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Antoranz Canales, Pedro and Barrio Uña, Juan Abel and Contreras González, José Luis and Fonseca González, Mª Victoria and Miranda Pantoja, José Miguel and Nieto, Daniel (2009) Upper limits on the VHE gamma-ray emission from the Willman 1 satellite galaxy with the Magic telescope. Astrophysical journal, 697 (2). pp. 1299-1304. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/0004-637X/697/2/1299


We present the result of the observation of the ultrafaint dwarf galaxy Willman 1 performed with the 17 m MAGIC telescope during 15.5 hr between March and May 2008. No significant gamma-ray emission was found. We derived upper limits of the order of 10(-12) ph cm(-2) s(-1) on the integral flux above 100 GeV, which we compare with predictions from several of the established neutralino benchmark models in the mSUGRA parameter space. The neutralino annihilation spectra are defined after including the recently quantified contribution of internal bremsstrahlung from the virtual sparticles that mediate the annihilation. Flux boost factors of three orders of magnitude are required even in the most optimistic scenario to match our upper limits. However, uncertainties in the dark matter intrinsic and extrinsic properties (e.g., presence of substructures, Sommerfeld effect) may significantly reduce this gap.

Item Type:Article
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© The American Astronomical Society. We thank the Instituto de Astrofisica de Canarias for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German BMBF and MPG, the Italian INFN, and Spanish MCINN is gratefully acknowledged. This work was also supported by ETH Research grant TH 34/043, by the Polish MNiSzW grant N N203 390834, and by the YIP of the Helmholtz Gemeinschaft. Finally, we thank the anonymous referees for useful comments.

Uncontrolled Keywords:Dark-Matter Annihilation, Milky-Way, Dward Galaxy, Galactic Satellites, Ursa-Major, Substructure, Search, Signal, Halos, Supersymmetry.
Subjects:Sciences > Physics > Electronics
Sciences > Physics > Electricity
Sciences > Physics > Nuclear physics
ID Code:22730
Deposited On:10 Sep 2013 12:16
Last Modified:10 Dec 2018 14:58

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