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

Aharonian, F.; Akhperjanian, A. G.; Almeida, U. Barres de; Bazer‐Bachi, A. R.; Behera, B.; Benbow, W.; Bernlöhr, K.; Boisson, C.; Bochow, V.; Borrel, V.; Braun, I.; Brion, E.; Brucker, J.; Brun, P.; Bühler, R.; Bulik, T.; Büsching, I.; Boutelier, T.; Carrigan, S.; Chadwick, P. M.; Charbonnier, A.; Chaves, R. C. G.; Cheesebrough, A.; Chounet, L.‐M.; Clapson, A. C.; Coignet, G.; Costamante, L.; Dalton, M.; Degrange, B.; Deil, C.; Dickinson, H. J.; Djannati‐Ataï, A.; Domainko, W.; Drury, L. O’c.; Dubois, F.; Dubus, G.; Dyks, J.; Dyrda, M.; Egberts, K.; Emmanoulopoulos, D.; Espigat, P.; Farnier, C.; Feinstein, F.; Fiaßon, A.; Förster, A.; Fontaine, G.; Füßling, M.; Gabici, S.; Gallant, Y. A.; Gérard, L.; Giebels, B.; Glicenstein, J. F.; Glück, B.; Goret, P.; Hadjichristidis, C.; Hauser, D.; Hauser, M.; Heinz, Sebastian; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J. A.; Hoffmann, A.; Hofmann, W.; Holleran, M.; Hoppe, S.; Horns, D.; Jachołkowska, A.; Jager, O. C. de; Jung, I.; Katarzyński, K.; Kaufmann, S.; Kendziorra, E.; Kerschhaggl, M.; Khangulyan, D.; Khélifi, B.; Keogh, D.; Komin, Nu.; Kosack, K.; Lamanna, G.; Lenain, J.‐P.; Löhse, T.; Marandon, V.; Martin, Jean‐Michel; Martineau‐Huynh, O.; Marcowith, A.; Maurin, D.; McComb, T. J. L.; Medina, C.; Moderski, R.; Moulin, Emmanuel; Naumann-Godó, M.; Naurois, M. de; Nedbal, D.; Nekrassov, D.; Niemiec, J.; Nolan, S. J.; Ohm, S.; Olive, J.‐F.; Wilhelmi, E. de Oña; Orford, K. J.; Osborne, J. L.; Ostrowski, M.; Panter, M.; Pedaletti, G.; Pelletier, G.; Petrucci, P.-O.; Pita, S.; Pühlhofer, G.; Punch, M.; Quirrenbach, A.; Raubenheimer, B. C.; Raue, M.; Rayner, S. M.; Renaud, M.; Rieger, F.; Ripken, J.; Rob, L.; Rosier‐Lees, S.; Rowell, G.; Rudak, B.; Rulten, C. B.; Ruppel, J.; Sahakian, V.; Santangelo, A.; Schlickeiser, R.; Schöck, F. M.; Schröder, R.; Schwanke, U.; Schwarzburg, S.; Schwemmer, S.; Shalchi, A.; Skilton, J. L.; Sol, H.; Spangler, D.; Stawarz, Ł.; Steenkamp, R.; Stegmann, C.; Superina, G.; Tam, P. H. T.; Tavernet, J.‐P.; Terrier, R.; Tibolla, O.; Eldik, C. van; Vasileiadis, G.; Venter, C.; Vialle, J. P.; Vincent, P.; Vivier, M.; Völk, H. J.; Volpe, F.; Wagner, S. J.; Ward, M. J.; Zdziarski, A. A.; Zech, A.

doi:10.1088/0004-637x/691/1/175

Cited by 48 publications

(53 citation statements)

References 39 publications

(38 reference statements)

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“…Such searches are generally conducted using pointed astrophysical observations of nearby dark matter overdensities, because the annihilation/decay rate strongly depends on the dark matter density. Popular targets include the Galactic Center [5][6][7][8][9][10][11], satellite galaxies of the Milky Way [12][13][14][15][16][17][18], globular clusters [19,20] and clusters of galaxy [21][22][23][24][25][26]. Non-targeted searches are also currently under consideration.…”

Section: Introductionmentioning

confidence: 99%

VERITAS deep observations of the dwarf spheroidal galaxy Segue 1

Aliu¹,

Archambault²,

Arlen³

et al. 2012

Phys. Rev. D

Self Cite

104

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The VERITAS array of Cherenkov telescopes has carried out a deep observational program on the nearby dwarf spheroidal galaxy Segue 1. We report on the results of nearly 48 hours of good quality selected data, taken between January 2010 and May 2011. No significant γ-ray emission is detected at the nominal position of Segue 1, and upper limits on the integrated flux are derived. According to recent studies, Segue 1 is the most dark matter-dominated dwarf spheroidal galaxy currently known. We derive stringent bounds on various annihilating and decaying dark matter particle models. The upper limits on the velocity-weighted annihilation cross-section are σv 95% CL < ∼ 10 −23 cm 3 s −1 , improving our limits from previous observations of dwarf spheroidal galaxies by at least a factor of two for dark matter particle masses m χ > ∼ 300 GeV. The lower limits on the decay lifetime are at the level of τ 95% CL > ∼ 10 24 s. Finally, we address the interpretation of the cosmic ray lepton anomalies measured by ATIC and PAMELA in terms of dark matter annihilation, and show that the VERITAS observations of Segue 1 disfavor such a scenario.

show abstract

Section: Introductionmentioning

confidence: 99%

VERITAS deep observations of the dwarf spheroidal galaxy Segue 1

Aliu¹,

Archambault²,

Arlen³

et al. 2012

Phys. Rev. D

Self Cite

104

View full text Add to dashboard Cite

show abstract

“…The prospects for DM annihilation detection from dSphs has in general been found to be rather poor, with detection with Fermi being unlikely [150,151]. Some of the dSphs have already been the subject of observational searches for DM annihilation and some limits on the DM annihilation signal have already been set [152,153,154,155,156,157].…”

Section: Predicted Annihilation Signals For Dwarf Spheroidalsmentioning

confidence: 99%

Substructure boosts to dark matter annihilation from Sommerfeld enhancement

Bovy

2009

Phys. Rev. D

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The recently introduced Sommerfeld enhancement of the dark matter annihilation cross section has important implications for the detection of dark matter annihilation in subhalos in the Galactic halo. In addition to the boost to the dark matter annihilation cross section from the high densities of these subhalos with respect to the main halo, an additional boost caused by the Sommerfeld enhancement results from the fact that they are kinematically colder than the Galactic halo. If we further believe the generic prediction of CDM that in each subhalo there is an abundance of substructure which is approximately self-similar to that of the Galactic halo, then I show that additional boosts coming from the density enhancements of these small substructures and their small velocity dispersions enhance the dark matter annihilation cross section even further. I find that very large boost factors (10 5 to 10 9 ) are obtained in a large class of models. The implications of these boost factors for the detection of dark matter annihilation from dwarf Spheroidal galaxies in the Galactic halo are such that, generically, they outshine the background gamma-ray flux and are detectable by the Fermi Gamma-ray Space Telescope.

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“…Over the last decade, a number of dSphs have been observed by the present generation of IACTs: MAGIC [17][18][19], H.E.S.S. [20][21][22] and VERITAS [23,24], as well as by the Large Area Telescope (LAT) on board the Fermi satellite [25].…”

Section: Introductionmentioning

confidence: 99%

Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC

Aleksić

2016

Springer Theses

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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 + τ − , and is of order σ ann v ≃ 1.2×10 −24 cm 3 s −1 -a factor ∼40 above the σ ann v thermal value.

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

Cited by 48 publications

References 39 publications

VERITAS deep observations of the dwarf spheroidal galaxy Segue 1

VERITAS deep observations of the dwarf spheroidal galaxy Segue 1

Substructure boosts to dark matter annihilation from Sommerfeld enhancement

Optimized Dark Matter Searches in Deep Observations of Segue 1 with MAGIC

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