Upper Limit for γ‐Ray Emission above 140 GeV from the Dwarf Spheroidal Galaxy Draco

Albert, J.; Aliu, E.; Anderhub, H.; Antoranz, P.; Backes, Michael; Baixeras, C.; Barrio, J. A.; Bartko, H.; Bastieri, D.; Becker, J.; Bednarek, W.; Berger, K.; Bigongiari, C.; Biland, A.; Böck, R.; Bordas, P.; Bosch‐Ramon, V.; Bretz, T.; Britvitch, I.; Cámara, Miguel; Carmona, E.; Chilingarian, A.; Commichau, S.; Contreras, J. L.; Cortina, J.; Costado, M. T.; Curtef, V.; Danielyan, V.; Dazzi, F.; Angelis, A. De; Mendez, C. Delgado; Reyes, R. de los; Lotto, B. De; María, Mónica; Sabata, F. De; Dorner, D.; Doro, M.; Errando, M.; Fagiolini, M.; Ferenc, D.; Fernández, E.; Firpo, R.; Fonseca, M. V.; Font, L.; Fuchs, M.; Galante, N.; García-López, R. J.; Garczarczyk, M.; Gaug, M.; Göebel, F.; Hakobyan, D.; Hayashida, M.; Hengstebeck, T.; Herrero, A.; Höhne, D.; Hose, J.; Huber, Stefan; Hsu, C. C.; Jacoń, P.; Jogler, T.; Kosyra, R.; Kranich, D.; Laille, A.; Lindfors, E.; Lombardi, S.; Longo, F.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Mariotti, M.; Martı́nez, M.; Mazin, D.; Merck, C.; Meucci, M.; Meyer, M.; Miranda, J. M.; Mirzoyan, R.; Mizobuchi, S.; Moles, M.; Moralejo, A.; Nieto, D.; Nilsson, K.; Ninković, J.; Oña-Wilhelmi, E.; Otte, A. N.; Oya, I.; Panniello, M.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauß, F.; Pegna, R.; Pérez-Torres, M. A.; Peršić, M.; Peruzzo, L.; Piccioli, A.; Prada, Francisco; Prandini, E.; Puchades, N.; Raymers, A.; Rhode, W.; Ribó, M.; Rico, J.; Rissi, M.; Robert, A.; Rügamer, S.; Saggion, A.; Saito, Takayuki; Sánchez, A.; Sánchez‐Conde, Miguel A.; Sartori, P.; Scalzotto, V.; Scapin, V.; Schmitt, R.; Schweizer, T.; Shayduk, M.; Shinozaki, K.; Shore, S. N.; Sidro, N.; Sillanpää, A.; Sobczyńska, D.; Spanier, F.; Stamerra, A.; Stark, L. S.; Takalo, L. O.; Temnikov, P.; Tescaro, D.; Teshima, M.; Torres, D. F.; Turini, N.; Vankov, H.; Venturini, A.; Vitale, V.; Wagner, R. M.; Wittek, W.; Zandanel, F.; Zanin, R.; Zapatero, J.

doi:10.1086/529135

Cited by 74 publications

(64 citation statements)

References 23 publications

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“…H.E.S.S. limits are comparable to the limits reported by MAGIC [49] and VERITAS [50], but weaker than those obtained by Fermi-LAT [11] in the GeV mass range. Nevertheless, they are complementary to the Fermi-LAT limits in the TeV range.…”

Section: Discussionsupporting

confidence: 59%

H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies

Abramowski¹,

Acero²,

Aharonian³

et al. 2011

Astroparticle Physics

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The Sculptor and Carina Dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total of 11.8 and 14.8 hours of high quality data, respectively. No gamma-ray signal was detected at the nominal positions of these galaxies above 220 GeV and 320 GeV, respectively. Upper limits on the gamma-ray fluxes at 95% C.L. assuming two forms for the spectral energy distribution (a power law shape and one derived from dark matter annihilation) are obtained at the level of 10 −13 to 10 −12 cm −2 s −1 in the TeV range. Constraints on the velocity weighted dark matter particle annihilation cross section for both Sculptor and Carina dwarf galaxies range from σv ∼ 10 −21 cm 3 s −1 down to σv ∼ 10 −22 cm 3 s −1 depending on the dark 3 matter halo model used. Possible enhancements of the gamma-ray flux are studied: the Sommerfeld effect, which is found to exclude some dark matter particle masses, the internal Bremsstrahlung and clumps in the dark-matter halo distributions.

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Section: Discussionsupporting

confidence: 59%

H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies

Abramowski¹,

Acero²,

Aharonian³

et al. 2011

Astroparticle Physics

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“…Draco is consistent with an old low-metallicity ([Fe/H] = −1.8 ± 0.2) stellar population with no significant star formation over the last 2 Gyr (Aparicio et al 2001). Draco previously has been observed at VHE energies by the STACEE observatory (Driscoll et al 2008), the Whipple 10 m telescope (Wood et al 2008), and the MAGIC telescope (Albert et al 2008).…”

Section: Observational Targetssupporting

confidence: 64%

Veritas Search for Vhe Gamma-Ray Emission From Dwarf Spheroidal Galaxies

Acciari

Arlen

Aune

et al. 2010

ApJ

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Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of direct search or accelerator production experiments. We present the results of observations of the dwarf spheroidal galaxies Draco, Ursa Minor, Boötes 1, and Willman 1 conducted by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). These galaxies are nearby dark matter dominated objects located at a typical distance of several tens of kiloparsecs for which there are good measurements of the dark matter density profile from stellar velocity measurements. Since the conventional astrophysical background of very high energy gamma rays from these objects appears to be negligible, they are good targets to search for the secondary gamma-ray photons produced by interacting or decaying dark matter particles. No significant gamma-ray flux above 200 GeV was detected from these four dwarf galaxies for a typical exposure of ∼20 hr. The 95% confidence upper limits on the integral gamma-ray flux are in the range (0.4-2.2) × 10 −12 photons cm −2 s −1 . We interpret this limiting flux in the context of pair annihilation of weakly interacting massive particles (WIMPs) and derive constraints on the thermally averaged product of the total self-annihilation cross section and the relative velocity of the WIMPs ( σ v 10 −23 cm 3 s −1 for m χ 300 GeV c −2 ). This limit is obtained under conservative assumptions regarding the dark matter distribution in dwarf galaxies and is approximately 3 orders of magnitude above the generic theoretical prediction for WIMPs in the minimal supersymmetric standard model framework. However, significant uncertainty exists in the dark matter distribution as well as the neutralino cross sections which under favorable assumptions could further lower this limit.

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“…collaboration (Aharonian et al 2008 K-parity conservation, were derived. A null result was also established by the MAGIC collaboration (Albert et al 2008) and the WHIPPLE collaboration (Wood et al 2008), when searching for a DM annihilation signal toward the Draco dwarf galaxy. Upper limits on the velocity-weighted annihilation cross section of a DM particle were derived in the framework of minimal SUper GRAvity (mSUGRA) models and MSSM models.…”

Section: Introductionmentioning

confidence: 87%

A Search for a Dark Matter Annihilation Signal Toward the Canis Major Overdensity With H.E.S.S.

Aharonian

Akhperjanian

Almeida

et al. 2009

ApJ

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A search for a dark matter (DM) annihilation signal into γ -rays toward the direction of the Canis Major (CMa) overdensity is presented. The nature of CMa is still controversial and one scenario represents it as a dwarf galaxy, making it an interesting candidate for DM annihilation searches. A total of 9.6 hr of high-quality data were collected with the H.E.S.S. array of Imaging Atmospheric Cherenkov Telescopes, and no evidence for a very high energy γ -ray signal is found. Upper limits on the CMa dwarf galaxy mass of the order of 10 9 M are derived at the 95% confidence level (CL) assuming neutralino masses in the range 500 GeV-10 TeV and relatively large annihilation cross sections. Constraints on the velocity-weighted annihilation cross section σ v are calculated for specific weakly interacting massive-particle scenarios, using a Navarro-Frenk-White model for the DM halo profile and taking advantage of 175 176 AHARONIAN ET AL.Vol. 691 numerical simulations of hierarchical structure formation. Assuming a total halo mass of 3 × 10 8 M , 95% CL exclusion limits of the order of 5 × 10 −24 cm 3 s −1 are reached in the 500 GeV-10 TeV DM particle mass interval.

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Upper Limit for γ‐Ray Emission above 140 GeV from the Dwarf Spheroidal Galaxy Draco

Cited by 74 publications

References 23 publications

H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies

H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies

Veritas Search for Vhe Gamma-Ray Emission From Dwarf Spheroidal Galaxies

A Search for a Dark Matter Annihilation Signal Toward the Canis Major Overdensity With H.E.S.S.

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