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

A. Abramowski; F. Acero; F. Aharonian; A. G. Akhperjanian; G. Anton; A. Barnacka; U. Barres De Almeida; A. R. Bazer-Bachi; Y. Becherini; J. Becker; B. Behera; K. Bernlöhr; A. Bochow; C. Boisson; J. Bolmont; P. Bordas; V. Borrel; J. Brucker; F. Brun; P. Brun; T. Bulik; I. Büsching; S. Carrigan; S. Casanova; M. Cerruti; P. M. Chadwick; A. Charbonnier; R. C.G. Chaves; A. Cheesebrough; L. M. Chounet; A. C. Clapson; G. Coignet; J. Conrad; M. Dalton; M. K. Daniel; I. D. Davids; B. Degrange; C. Deil; H. J. Dickinson; A. Djannati-Ataï; W. Domainko; L. O.C. Drury; F. Dubois; G. Dubus; J. Dyks; M. Dyrda; K. Egberts; P. Eger; P. Espigat; L. Fallon; C. Farnier; S. Fegan; F. Feinstein; M. V. Fernandes; A. Fiasson; G. Fontaine; A. Förster; M. Füßling; Y. A. Gallant; H. Gast; L. Gérard; D. Gerbig; B. Giebels; J. F. Glicenstein; B. Glück; P. Goret; D. Göring; J. D. Hague; D. Hampf; M. Hauser; S. Heinz; G. Heinzelmann; G. Henri; G. Hermann; J. A. Hinton; A. Hoffmann; W. Hofmann; P. Hofverberg; D. Horns; A. Jacholkowska; O. C. De Jager; C. Jahn; M. Jamrozy; I. Jung; M. A. Kastendieck; K. Katarzyński; U. Katz; S. Kaufmann; D. Keogh; M. Kerschhaggl; D. Khangulyan; B. Khélifi; D. Klochkov; W. Kluźniak; T. Kneiske; Nu Komin; K. Kosack; R. Kossakowski; H. Laffon; G. Lamanna; D. Lennarz; T. Lohse; A. Lopatin; C. C. Lu; V. Marandon; A. Marcowith; J. Masbou; D. Maurin; N. Maxted; T. J.L. McComb; M. C. Medina; J. Méhault; R. Moderski; E. Moulin; C. L. Naumann; M. Naumann-Godo; M. De Naurois; D. Nedbal; D. Nekrassov; N. Nguyen; B. Nicholas; J. Niemiec; S. J. Nolan; S. Ohm; J. F. Olive; E. De Oña Wilhelmi; B. Opitz; M. Ostrowski; M. Panter; M. Paz Arribas; G. Pedaletti; G. Pelletier; P. O. Petrucci; S. Pita; G. Pühlhofer; M. Punch; A. Quirrenbach; M. Raue; S. M. Rayner; A. Reimer; O. Reimer; M. Renaud; R. De Los Reyes; F. Rieger; J. Ripken; L. Rob; S. Rosier-Lees; G. Rowell; B. Rudak; C. B. Rulten; J. Ruppel; F. Ryde; V. Sahakian; A. Santangelo; R. Schlickeiser; F. M. Schöck; A. Schönwald; U. Schwanke; S. Schwarzburg; S. Schwemmer; A. Shalchi; M. Sikora; J. L. Skilton; H. Sol; G. Spengler; L. Stawarz; R. Steenkamp; C. Stegmann; F. Stinzing; I. Sushch; A. Szostek; J. P. Tavernet; R. Terrier; O. Tibolla; M. Tluczykont; K. Valerius; C. Van Eldik; G. Vasileiadis; C. Venter; J. P. Vialle; A. Viana; P. Vincent; M. Vivier; H. J. Völk; F. Volpe; S. Vorobiov; M. Vorster; S. J. Wagner; M. Ward; A. Wierzcholska; A. Zajczyk; A. A. Zdziarski; A. Zech; H. S. Zechlin

doi:10.1016/j.astropartphys.2010.12.006

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

A. Abramowski
, F. Acero
, F. Aharonian
, A. G. Akhperjanian
, G. Anton
, A. Barnacka
, U. Barres De Almeida
, A. R. Bazer-Bachi
, Y. Becherini
, J. Becker
, B. Behera
, K. Bernlöhr
, A. Bochow
, C. Boisson
, J. Bolmont
, P. Bordas
, V. Borrel
, J. Brucker
, F. Brun
, P. Brun

T. Bulik, I. Büsching, S. Carrigan, S. Casanova, M. Cerruti, P. M. Chadwick, A. Charbonnier, R. C.G. Chaves, A. Cheesebrough, L. M. Chounet, A. C. Clapson, G. Coignet, J. Conrad, M. Dalton, M. K. Daniel, I. D. Davids, B. Degrange, C. Deil, H. J. Dickinson, A. Djannati-Ataï, W. Domainko, L. O.C. Drury, F. Dubois, G. Dubus, J. Dyks, M. Dyrda, K. Egberts, P. Eger, P. Espigat, L. Fallon, C. Farnier, S. Fegan, F. Feinstein, M. V. Fernandes, A. Fiasson, G. Fontaine, A. Förster, M. Füßling, Y. A. Gallant, H. Gast, L. Gérard, D. Gerbig, B. Giebels, J. F. Glicenstein, B. Glück, P. Goret, D. Göring, J. D. Hague, D. Hampf, M. Hauser, S. Heinz, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, A. Hoffmann, W. Hofmann, P. Hofverberg, D. Horns, A. Jacholkowska, O. C. De Jager, C. Jahn, M. Jamrozy, I. Jung, M. A. Kastendieck, K. Katarzyński, U. Katz, S. Kaufmann, D. Keogh, M. Kerschhaggl, D. Khangulyan, B. Khélifi, D. Klochkov, W. Kluźniak, T. Kneiske, Nu Komin, K. Kosack, R. Kossakowski, H. Laffon, G. Lamanna, D. Lennarz, T. Lohse, A. Lopatin, C. C. Lu, V. Marandon, A. Marcowith, J. Masbou, D. Maurin, N. Maxted, T. J.L. McComb, M. C. Medina, J. Méhault, R. Moderski, E. Moulin, C. L. Naumann, M. Naumann-Godo, M. De Naurois, D. Nedbal, D. Nekrassov, N. Nguyen, B. Nicholas, J. Niemiec, S. J. Nolan, S. Ohm, J. F. Olive, E. De Oña Wilhelmi, B. Opitz, M. Ostrowski, M. Panter, M. Paz Arribas, G. Pedaletti, G. Pelletier, P. O. Petrucci, S. Pita, G. Pühlhofer, M. Punch, A. Quirrenbach, M. Raue, S. M. Rayner, A. Reimer, O. Reimer, M. Renaud, R. De Los Reyes, F. Rieger, J. Ripken, L. Rob, S. Rosier-Lees, G. Rowell, B. Rudak, C. B. Rulten, J. Ruppel, F. Ryde, V. Sahakian, A. Santangelo, R. Schlickeiser, F. M. Schöck, A. Schönwald, U. Schwanke, S. Schwarzburg, S. Schwemmer, A. Shalchi, M. Sikora, J. L. Skilton, H. Sol, G. Spengler, L. Stawarz, R. Steenkamp, C. Stegmann, F. Stinzing, I. Sushch, A. Szostek, J. P. Tavernet, R. Terrier, O. Tibolla, M. Tluczykont, K. Valerius, C. Van Eldik, G. Vasileiadis, C. Venter, J. P. Vialle, A. Viana, P. Vincent, M. Vivier, H. J. Völk, F. Volpe, S. Vorobiov, M. Vorster, S. J. Wagner, M. Ward, A. Wierzcholska, A. Zajczyk, A. A. Zdziarski, A. Zech, H. S. Zechlin

Research output: Contribution to journal › Article › peer-review

Abstract

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 h and 14.8 h 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% CL 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^-13-10^-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 cm³ s^-1 down to 〈σv〉 ∼ 10^-22 cm³ s ^-1 depending on the dark 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.

Original language	English
Pages (from-to)	608-616
Number of pages	9
Journal	Astroparticle Physics
Volume	34
Issue number	8
DOIs	https://doi.org/10.1016/j.astropartphys.2010.12.006
Publication status	Published - 1 Jan 2011

Keywords

Carina
Dark matter
Gamma-rays: observations - Dwarf spheroidal galaxy
Internal Bremsstrahlung
Sculptor
Sommerfeld enhancement

Access to Document

10.1016/j.astropartphys.2010.12.006

Cite this

Abramowski, A., Acero, F., Aharonian, F., Akhperjanian, A. G., Anton, G., Barnacka, A., Barres De Almeida, U., Bazer-Bachi, A. R., Becherini, Y., Becker, J., Behera, B., Bernlöhr, K., Bochow, A., Boisson, C., Bolmont, J., Bordas, P., Borrel, V., Brucker, J., Brun, F., ... Zechlin, H. S. (2011). H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies. Astroparticle Physics, 34(8), 608-616. https://doi.org/10.1016/j.astropartphys.2010.12.006

@article{7fc891e838b04c2bae79f6513514ebce,

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

abstract = "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 h and 14.8 h 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\% CL 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 10-13-10-12 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 cm3 s-1 down to 〈σv〉 ∼ 10-22 cm3 s -1 depending on the dark 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.",

keywords = "Carina, Dark matter, Gamma-rays: observations - Dwarf spheroidal galaxy, Internal Bremsstrahlung, Sculptor, Sommerfeld enhancement",

author = "A. Abramowski and F. Acero and F. Aharonian and Akhperjanian, \{A. G.\} and G. Anton and A. Barnacka and \{Barres De Almeida\}, U. and Bazer-Bachi, \{A. R.\} and Y. Becherini and J. Becker and B. Behera and K. Bernl{\"o}hr and A. Bochow and C. Boisson and J. Bolmont and P. Bordas and V. Borrel and J. Brucker and F. Brun and P. Brun and T. Bulik and I. B{\"u}sching and S. Carrigan and S. Casanova and M. Cerruti and Chadwick, \{P. M.\} and A. Charbonnier and Chaves, \{R. C.G.\} and A. Cheesebrough and Chounet, \{L. M.\} and Clapson, \{A. C.\} and G. Coignet and J. Conrad and M. Dalton and Daniel, \{M. K.\} and Davids, \{I. D.\} and B. Degrange and C. Deil and Dickinson, \{H. J.\} and A. Djannati-Ata{\"i} and W. Domainko and Drury, \{L. O.C.\} and F. Dubois and G. Dubus and J. Dyks and M. Dyrda and K. Egberts and P. Eger and P. Espigat and L. Fallon and C. Farnier and S. Fegan and F. Feinstein and Fernandes, \{M. V.\} and A. Fiasson and G. Fontaine and A. F{\"o}rster and M. F{\"u}{\ss}ling and Gallant, \{Y. A.\} and H. Gast and L. G{\'e}rard and D. Gerbig and B. Giebels and Glicenstein, \{J. F.\} and B. Gl{\"u}ck and P. Goret and D. G{\"o}ring and Hague, \{J. D.\} and D. Hampf and M. Hauser and S. Heinz and G. Heinzelmann and G. Henri and G. Hermann and Hinton, \{J. A.\} and A. Hoffmann and W. Hofmann and P. Hofverberg and D. Horns and A. Jacholkowska and \{De Jager\}, \{O. C.\} and C. Jahn and M. Jamrozy and I. Jung and Kastendieck, \{M. A.\} and K. Katarzy{\'n}ski and U. Katz and S. Kaufmann and D. Keogh and M. Kerschhaggl and D. Khangulyan and B. Kh{\'e}lifi and D. Klochkov and W. Klu{\'z}niak and T. Kneiske and Nu Komin and K. Kosack and R. Kossakowski and H. Laffon and G. Lamanna and D. Lennarz and T. Lohse and A. Lopatin and Lu, \{C. C.\} and V. Marandon and A. Marcowith and J. Masbou and D. Maurin and N. Maxted and McComb, \{T. J.L.\} and Medina, \{M. C.\} and J. M{\'e}hault and R. Moderski and E. Moulin and Naumann, \{C. L.\} and M. Naumann-Godo and \{De Naurois\}, M. and D. Nedbal and D. Nekrassov and N. Nguyen and B. Nicholas and J. Niemiec and Nolan, \{S. J.\} and S. Ohm and Olive, \{J. F.\} and \{De O{\~n}a Wilhelmi\}, E. and B. Opitz and M. Ostrowski and M. Panter and \{Paz Arribas\}, M. and G. Pedaletti and G. Pelletier and Petrucci, \{P. O.\} and S. Pita and G. P{\"u}hlhofer and M. Punch and A. Quirrenbach and M. Raue and Rayner, \{S. M.\} and A. Reimer and O. Reimer and M. Renaud and \{De Los Reyes\}, R. and F. Rieger and J. Ripken and L. Rob and S. Rosier-Lees and G. Rowell and B. Rudak and Rulten, \{C. B.\} and J. Ruppel and F. Ryde and V. Sahakian and A. Santangelo and R. Schlickeiser and Sch{\"o}ck, \{F. M.\} and A. Sch{\"o}nwald and U. Schwanke and S. Schwarzburg and S. Schwemmer and A. Shalchi and M. Sikora and Skilton, \{J. L.\} and H. Sol and G. Spengler and L. Stawarz and R. Steenkamp and C. Stegmann and F. Stinzing and I. Sushch and A. Szostek and Tavernet, \{J. P.\} and R. Terrier and O. Tibolla and M. Tluczykont and K. Valerius and \{Van Eldik\}, C. and G. Vasileiadis and C. Venter and Vialle, \{J. P.\} and A. Viana and P. Vincent and M. Vivier and V{\"o}lk, \{H. J.\} and F. Volpe and S. Vorobiov and M. Vorster and Wagner, \{S. J.\} and M. Ward and A. Wierzcholska and A. Zajczyk and Zdziarski, \{A. A.\} and A. Zech and Zechlin, \{H. S.\}",

year = "2011",

month = jan,

day = "1",

doi = "10.1016/j.astropartphys.2010.12.006",

language = "English",

volume = "34",

pages = "608--616",

journal = "Astroparticle Physics",

issn = "0927-6505",

number = "8",

}

Abramowski, A, Acero, F, Aharonian, F, Akhperjanian, AG, Anton, G, Barnacka, A, Barres De Almeida, U, Bazer-Bachi, AR, Becherini, Y, Becker, J, Behera, B, Bernlöhr, K, Bochow, A, Boisson, C, Bolmont, J, Bordas, P, Borrel, V, Brucker, J, Brun, F, Brun, P, Bulik, T, Büsching, I, Carrigan, S, Casanova, S, Cerruti, M, Chadwick, PM, Charbonnier, A, Chaves, RCG, Cheesebrough, A, Chounet, LM, Clapson, AC, Coignet, G, Conrad, J, Dalton, M, Daniel, MK, Davids, ID, Degrange, B, Deil, C, Dickinson, HJ, Djannati-Ataï, A, Domainko, W, Drury, LOC, Dubois, F, Dubus, G, Dyks, J, Dyrda, M, Egberts, K, Eger, P, Espigat, P, Fallon, L, Farnier, C, Fegan, S, Feinstein, F, Fernandes, MV, Fiasson, A, Fontaine, G, Förster, A, Füßling, M, Gallant, YA, Gast, H, Gérard, L, Gerbig, D, Giebels, B, Glicenstein, JF, Glück, B, Goret, P, Göring, D, Hague, JD, Hampf, D, Hauser, M, Heinz, S, Heinzelmann, G, Henri, G, Hermann, G, Hinton, JA, Hoffmann, A, Hofmann, W, Hofverberg, P, Horns, D, Jacholkowska, A, De Jager, OC, Jahn, C, Jamrozy, M, Jung, I, Kastendieck, MA, Katarzyński, K, Katz, U, Kaufmann, S, Keogh, D, Kerschhaggl, M, Khangulyan, D, Khélifi, B, Klochkov, D, Kluźniak, W, Kneiske, T, Komin, N, Kosack, K, Kossakowski, R, Laffon, H, Lamanna, G, Lennarz, D, Lohse, T, Lopatin, A, Lu, CC, Marandon, V, Marcowith, A, Masbou, J, Maurin, D, Maxted, N, McComb, TJL, Medina, MC, Méhault, J, Moderski, R, Moulin, E, Naumann, CL, Naumann-Godo, M, De Naurois, M, Nedbal, D, Nekrassov, D, Nguyen, N, Nicholas, B, Niemiec, J, Nolan, SJ, Ohm, S, Olive, JF, De Oña Wilhelmi, E, Opitz, B, Ostrowski, M, Panter, M, Paz Arribas, M, Pedaletti, G, Pelletier, G, Petrucci, PO, Pita, S, Pühlhofer, G, Punch, M, Quirrenbach, A, Raue, M, Rayner, SM, Reimer, A, Reimer, O, Renaud, M, De Los Reyes, R, Rieger, F, Ripken, J, Rob, L, Rosier-Lees, S, Rowell, G, Rudak, B, Rulten, CB, Ruppel, J, Ryde, F, Sahakian, V, Santangelo, A, Schlickeiser, R, Schöck, FM, Schönwald, A, Schwanke, U, Schwarzburg, S, Schwemmer, S, Shalchi, A, Sikora, M, Skilton, JL, Sol, H, Spengler, G, Stawarz, L, Steenkamp, R, Stegmann, C, Stinzing, F, Sushch, I, Szostek, A, Tavernet, JP, Terrier, R, Tibolla, O, Tluczykont, M, Valerius, K, Van Eldik, C, Vasileiadis, G, Venter, C, Vialle, JP, Viana, A, Vincent, P, Vivier, M, Völk, HJ, Volpe, F, Vorobiov, S, Vorster, M, Wagner, SJ, Ward, M, Wierzcholska, A, Zajczyk, A, Zdziarski, AA, Zech, A & Zechlin, HS 2011, 'H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies', Astroparticle Physics, vol. 34, no. 8, pp. 608-616. https://doi.org/10.1016/j.astropartphys.2010.12.006

TY - JOUR

T1 - H.E.S.S. constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies

AU - Abramowski, A.

AU - Acero, F.

AU - Aharonian, F.

AU - Akhperjanian, A. G.

AU - Anton, G.

AU - Barnacka, A.

AU - Barres De Almeida, U.

AU - Bazer-Bachi, A. R.

AU - Becherini, Y.

AU - Becker, J.

AU - Behera, B.

AU - Bernlöhr, K.

AU - Bochow, A.

AU - Boisson, C.

AU - Bolmont, J.

AU - Bordas, P.

AU - Borrel, V.

AU - Brucker, J.

AU - Brun, F.

AU - Brun, P.

AU - Bulik, T.

AU - Büsching, I.

AU - Carrigan, S.

AU - Casanova, S.

AU - Cerruti, M.

AU - Chadwick, P. M.

AU - Charbonnier, A.

AU - Chaves, R. C.G.

AU - Cheesebrough, A.

AU - Chounet, L. M.

AU - Clapson, A. C.

AU - Coignet, G.

AU - Conrad, J.

AU - Dalton, M.

AU - Daniel, M. K.

AU - Davids, I. D.

AU - Degrange, B.

AU - Deil, C.

AU - Dickinson, H. J.

AU - Djannati-Ataï, A.

AU - Domainko, W.

AU - Drury, L. O.C.

AU - Dubois, F.

AU - Dubus, G.

AU - Dyks, J.

AU - Dyrda, M.

AU - Egberts, K.

AU - Eger, P.

AU - Espigat, P.

AU - Fallon, L.

AU - Farnier, C.

AU - Fegan, S.

AU - Feinstein, F.

AU - Fernandes, M. V.

AU - Fiasson, A.

AU - Fontaine, G.

AU - Förster, A.

AU - Füßling, M.

AU - Gallant, Y. A.

AU - Gast, H.

AU - Gérard, L.

AU - Gerbig, D.

AU - Giebels, B.

AU - Glicenstein, J. F.

AU - Glück, B.

AU - Goret, P.

AU - Göring, D.

AU - Hague, J. D.

AU - Hampf, D.

AU - Hauser, M.

AU - Heinz, S.

AU - Heinzelmann, G.

AU - Henri, G.

AU - Hermann, G.

AU - Hinton, J. A.

AU - Hoffmann, A.

AU - Hofmann, W.

AU - Hofverberg, P.

AU - Horns, D.

AU - Jacholkowska, A.

AU - De Jager, O. C.

AU - Jahn, C.

AU - Jamrozy, M.

AU - Jung, I.

AU - Kastendieck, M. A.

AU - Katarzyński, K.

AU - Katz, U.

AU - Kaufmann, S.

AU - Keogh, D.

AU - Kerschhaggl, M.

AU - Khangulyan, D.

AU - Khélifi, B.

AU - Klochkov, D.

AU - Kluźniak, W.

AU - Kneiske, T.

AU - Komin, Nu

AU - Kosack, K.

AU - Kossakowski, R.

AU - Laffon, H.

AU - Lamanna, G.

AU - Lennarz, D.

AU - Lohse, T.

AU - Lopatin, A.

AU - Lu, C. C.

AU - Marandon, V.

AU - Marcowith, A.

AU - Masbou, J.

AU - Maurin, D.

AU - Maxted, N.

AU - McComb, T. J.L.

AU - Medina, M. C.

AU - Méhault, J.

AU - Moderski, R.

AU - Moulin, E.

AU - Naumann, C. L.

AU - Naumann-Godo, M.

AU - De Naurois, M.

AU - Nedbal, D.

AU - Nekrassov, D.

AU - Nguyen, N.

AU - Nicholas, B.

AU - Niemiec, J.

AU - Nolan, S. J.

AU - Ohm, S.

AU - Olive, J. F.

AU - De Oña Wilhelmi, E.

AU - Opitz, B.

AU - Ostrowski, M.

AU - Panter, M.

AU - Paz Arribas, M.

AU - Pedaletti, G.

AU - Pelletier, G.

AU - Petrucci, P. O.

AU - Pita, S.

AU - Pühlhofer, G.

AU - Punch, M.

AU - Quirrenbach, A.

AU - Raue, M.

AU - Rayner, S. M.

AU - Reimer, A.

AU - Reimer, O.

AU - Renaud, M.

AU - De Los Reyes, R.

AU - Rieger, F.

AU - Ripken, J.

AU - Rob, L.

AU - Rosier-Lees, S.

AU - Rowell, G.

AU - Rudak, B.

AU - Rulten, C. B.

AU - Ruppel, J.

AU - Ryde, F.

AU - Sahakian, V.

AU - Santangelo, A.

AU - Schlickeiser, R.

AU - Schöck, F. M.

AU - Schönwald, A.

AU - Schwanke, U.

AU - Schwarzburg, S.

AU - Schwemmer, S.

AU - Shalchi, A.

AU - Sikora, M.

AU - Skilton, J. L.

AU - Sol, H.

AU - Spengler, G.

AU - Stawarz, L.

AU - Steenkamp, R.

AU - Stegmann, C.

AU - Stinzing, F.

AU - Sushch, I.

AU - Szostek, A.

AU - Tavernet, J. P.

AU - Terrier, R.

AU - Tibolla, O.

AU - Tluczykont, M.

AU - Valerius, K.

AU - Van Eldik, C.

AU - Vasileiadis, G.

AU - Venter, C.

AU - Vialle, J. P.

AU - Viana, A.

AU - Vincent, P.

AU - Vivier, M.

AU - Völk, H. J.

AU - Volpe, F.

AU - Vorobiov, S.

AU - Vorster, M.

AU - Wagner, S. J.

AU - Ward, M.

AU - Wierzcholska, A.

AU - Zajczyk, A.

AU - Zdziarski, A. A.

AU - Zech, A.

AU - Zechlin, H. S.

PY - 2011/1/1

Y1 - 2011/1/1

N2 - 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 h and 14.8 h 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% CL 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 10-13-10-12 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 cm3 s-1 down to 〈σv〉 ∼ 10-22 cm3 s -1 depending on the dark 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.

AB - 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 h and 14.8 h 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% CL 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 10-13-10-12 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 cm3 s-1 down to 〈σv〉 ∼ 10-22 cm3 s -1 depending on the dark 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.

KW - Carina

KW - Dark matter

KW - Gamma-rays: observations - Dwarf spheroidal galaxy

KW - Internal Bremsstrahlung

KW - Sculptor

KW - Sommerfeld enhancement

U2 - 10.1016/j.astropartphys.2010.12.006

DO - 10.1016/j.astropartphys.2010.12.006

M3 - Article

AN - SCOPUS:79351470152

SN - 0927-6505

VL - 34

SP - 608

EP - 616

JO - Astroparticle Physics

JF - Astroparticle Physics

IS - 8

ER -

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

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