2381/42425 H Abdallah H Abdallah A Abramowski A Abramowski F Aharonian F Aharonian FA Benkhali FA Benkhali EO Anguner EO Anguner M Arakawa M Arakawa M Arrieta M Arrieta P Aubert P Aubert M Backes M Backes A Balzer A Balzer M Barnard M Barnard Y Becherini Y Becherini JB Tjus JB Tjus D Berge D Berge S Bernhard S Bernhard K Bernloehr K Bernloehr R Blackwell R Blackwell M Bottcher M Bottcher C Boisson C Boisson J Bolmont J Bolmont S Bonnefoy S Bonnefoy P Bordas P Bordas J Bregeon J Bregeon F Brun F Brun P Brun P Brun M Bryan M Bryan M Buechele M Buechele T Bulik T Bulik M Capasso M Capasso S Caroff S Caroff A Carosi A Carosi J Carr J Carr S Casanova S Casanova M Cerruti M Cerruti N Chakraborty N Chakraborty RCG Chaves RCG Chaves A Chen A Chen J Chevalier J Chevalier S Colafrancesco S Colafrancesco B Condon B Condon J Conrad J Conrad ID Davids ID Davids J Decock J Decock C Deil C Deil J Devin J Devin P Dewilt P Dewilt L Dirson L Dirson A Djannati-Atai A Djannati-Atai W Domainko W Domainko A Donath A Donath LO Drury LO Drury K Dutson K Dutson J Dyks J Dyks T Edwards T Edwards K Egberts K Egberts P Eger P Eger G Emery G Emery J-P Ernenwein J-P Ernenwein S Eschbach S Eschbach C Farnier C Farnier S Fegan S Fegan M Fernandes M Fernandes A Fiasson A Fiasson G Fontaine G Fontaine A Foerster A Foerster S Funk S Funk M Fuessling M Fuessling S Gabici S Gabici YA Gallant YA Gallant T Garrigoux T Garrigoux F Gate F Gate G Giavitto G Giavitto B Giebels B Giebels D Glawion D Glawion JF Glicenstein JF Glicenstein D Gottschall D Gottschall M-H Grondin M-H Grondin J Hahn J Hahn M Haupt M Haupt J Hawkes J Hawkes G Heinzelmann G Heinzelmann G Henri G Henri G Hermann G Hermann JA Hinton JA Hinton W Hofmann W Hofmann C Hoischen C Hoischen TL Holch TL Holch M Holler M Holler D Horns D Horns A Ivascenko A Ivascenko H Iwasaki H Iwasaki A Jacholkowska A Jacholkowska M Jamrozy M Jamrozy M Janiak M Janiak D Jankowsky D Jankowsky F Jankowsky F Jankowsky M Jingo M Jingo L Jouvin L Jouvin I Jung-Richardt I Jung-Richardt MA Kastendieck MA Kastendieck K Katarzynski K Katarzynski M Katsuragawa M Katsuragawa U Katz U Katz D Kerszberg D Kerszberg D Khangulyan D Khangulyan B Khelifi B Khelifi J King J King S Klepser S Klepser D Klochkov D Klochkov W Kluzniak W Kluzniak N Komin N Komin K Kosack K Kosack S Krakau S Krakau M Kraus M Kraus PP Krueger PP Krueger H Laffon H Laffon G Lamanna G Lamanna J Lau J Lau J-P Lees J-P Lees J Lefaucheur J Lefaucheur A Lemiere A Lemiere M Lemoine-Goumard M Lemoine-Goumard J-P Lenain J-P Lenain E Leser E Leser R Liu R Liu T Lohse T Lohse M Lorentz M Lorentz R Lopez-Coto R Lopez-Coto I Lypova I Lypova D Malyshev D Malyshev V Marandon V Marandon A Marcowith A Marcowith C Mariaud C Mariaud R Marx R Marx G Maurin G Maurin N Maxted N Maxted M Mayer M Mayer PJ Meintjes PJ Meintjes M Meyer M Meyer AMW Mitchell AMW Mitchell R Moderski R Moderski M Mohamed M Mohamed L Mohrmann L Mohrmann K Mora K Mora E Moulin E Moulin T Murach T Murach S Nakashima S Nakashima M de Naurois M de Naurois H Ndiyavala H Ndiyavala F Niederwanger F Niederwanger J Niemiec J Niemiec L Oakes L Oakes P O'Brien P O'Brien H Odaka H Odaka S Ohm S Ohm M Ostrowski M Ostrowski I Oya I Oya M Padovani M Padovani M Panter M Panter RD Parsons RD Parsons NW Pekeur NW Pekeur G Pelletier G Pelletier C Perennes C Perennes P-O Petrucci P-O Petrucci B Peyaud B Peyaud Q Piel Q Piel S Pita S Pita V Poireau V Poireau H Poon H Poon D Prokhorov D Prokhorov H Prokoph H Prokoph G Puelhofer G Puelhofer M Punch M Punch A Quirrenbach A Quirrenbach S Raab S Raab R Rauth R Rauth A Reimer A Reimer O Reimer O Reimer M Renaud M Renaud R De Los Reyes R De Los Reyes F Rieger F Rieger L Rinchiuso L Rinchiuso C Romoli C Romoli G Rowell G Rowell B Rudak B Rudak CB Rulten CB Rulten V Sahakian V Sahakian S Saito S Saito DA Sanchez DA Sanchez A Santangelo A Santangelo M Sasaki M Sasaki M Schandri M Schandri R Schlickeiser R Schlickeiser F Schussler F Schussler A Schulz A Schulz U Schwanke U Schwanke S Schwemmer S Schwemmer M Seglar-Arroyo M Seglar-Arroyo M Settimo M Settimo AS Seyffert AS Seyffert N Shafi N Shafi I Shilon I Shilon K Shiningayamwe K Shiningayamwe R Simoni R Simoni H Sol H Sol F Spanier F Spanier M Spir-Jacob M Spir-Jacob L Stawarz L Stawarz R Steenkamp R Steenkamp C Stegmann C Stegmann C Steppa C Steppa I Sushch I Sushch T Takahashi T Takahashi J-P Tavernet J-P Tavernet T Tavernier T Tavernier AM Taylor AM Taylor R Terrier R Terrier L Tibaldo L Tibaldo D Tiziani D Tiziani M Tluczykont M Tluczykont C Trichard C Trichard M Tsirou M Tsirou N Tsuji N Tsuji R Tuffs R Tuffs Y Uchiyama Y Uchiyama J van der Walt J van der Walt C van Eldik C van Eldik C van Rensburg C van Rensburg B van Soelen B van Soelen G Vasileiadis G Vasileiadis J Veh J Veh C Venter C Venter A Viana A Viana P Vincent P Vincent J Vink J Vink F Voisin F Voisin HJ Voelk HJ Voelk T Vuillaume T Vuillaume Z Wadiasingh Z Wadiasingh SJ Wagner SJ Wagner P Wagner P Wagner RM Wagner RM Wagner R White R White A Wierzcholska A Wierzcholska P Willmann P Willmann A Woernlein A Woernlein D Wouters D Wouters R Yang R Yang D Zaborov D Zaborov M Zacharias M Zacharias R Zanin R Zanin AA Zdziarski AA Zdziarski A Zech A Zech F Zefi F Zefi A Ziegler A Ziegler J Zorn J Zorn N Zywucka N Zywucka Search for gamma-Ray Line Signals from Dark Matter Annihilations in the Inner Galactic Halo from 10 Years of Observations with HESS University of Leicester 2018 Science & Technology Physical Sciences Physics, Multidisciplinary Physics CANDIDATES MILKY 2018-06-07 08:18:56 Journal contribution https://figshare.le.ac.uk/articles/journal_contribution/Search_for_gamma-Ray_Line_Signals_from_Dark_Matter_Annihilations_in_the_Inner_Galactic_Halo_from_10_Years_of_Observations_with_HESS/10229777 Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy γ rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and proximity to Earth. We report on a search for a monoenergetic spectral line from self-annihilations of DM particles in the energy range from 300 GeV to 70 TeV using a twodimensional maximum likelihood method taking advantage of both the spectral and spatial features of the signal versus background. The analysis makes use of Galactic center observations accumulated over ten years (2004–2014) with the H.E.S.S. array of ground-based Cherenkov telescopes. No significant γ-ray excess above the background is found. We derive upper limits on the annihilation cross section hσvi for monoenergetic DM lines at the level of 4 × 10−28 cm3 s−1 at 1 TeV, assuming an Einasto DM profile for the Milky Way halo. For a DM mass of 1 TeV, they improve over the previous ones by a factor of 6. The present constraints are the strongest obtained so far for DM particles in the mass range 300 GeV–70 TeV. Groundbased γ-ray observations have reached sufficient sensitivity to explore relevant velocity-averaged cross sections for DM annihilation into two γ-ray photons at the level expected from the thermal relic density for TeV DM particles.