2010ApJ...712..147A

Query : 2010ApJ...712..147A

2010ApJ...712..147A - Astrophys. J., 712, 147-158 (2010/March-3)

Observations of Milky Way dwarf spheroidal galaxies with the fermi-large area telescope detector and constraints on dark matter models.

ABDO A.A., ACKERMANN M., AJELLO M., ATWOOD W.B., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BECHTOL K., BELLAZZINI R., BERENJI B., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BURNETT T.H., BUSON S., CALIANDRO G.A., CAMERON R.A., CARAVEO P.A., CASANDJIAN J.M., CECCHI C., CHEKHTMAN A., CHEUNG C.C., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., CONRAD J., DE ANGELIS A., DE PALMA F., DIGEL S.W., DO COUTO E SILVA E., DRELL P.S., DRLICA-WAGNER A., DUBOIS R., DUMORA D., FARNIER C., FAVUZZI C., FEGAN S.J., FOCKE W.B., FORTIN P., FRAILIS M., FUKAZAWA Y., FUSCO P., GARGANO F., GEHRELS N., GERMANI S., GIEBELS B., GIGLIETTO N., GIORDANO F., GLANZMAN T., GODFREY G., GRENIER I.A., GROVE J.E., GUILLEMOT L., GUIRIEC S., GUSTAFSSON M., HARDING A.K., HAYS E., HORAN D., HUGHES R.E., JACKSON M.S., JELTEMA T.E., JOHANNESSON G., JOHNSON A.S., JOHNSON R.P., JOHNSON W.N., KAMAE T., KATAGIRI H., KATAOKA J., KERR M., KNODLSEDER J., KUSS M., LANDE J., LATRONICO L., LEMOINE-GOUMARD M., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAKEEV A., MAZZIOTTA M.N., McENERY J.E., MEURER C., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORETTI E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NOLAN P.L., NORRIS J.P., NUSS E., OHSUGI T., OMODEI N., ORLANDO E., ORMES J.F., PANEQUE D., PANETTA J.H., PARENT D., PELASSA V., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., PROFUMO S., RAINO S., RANDO R., RAZZANO M., REIMER A., REIMER O., REPOSEUR T., RITZ S., RODRIGUEZ A.Y., ROTH M., SADROZINSKI H.F.-W., SANDER A., SAZ PARKINSON P.M., SCARGLE J.D., SCHALK T.L., SELLERHOLM A., SGRO C., SISKIND E.J., SMITH D.A., SMITH P.D., SPANDRE G., SPINELLI P., STRICKMAN M.S., SUSON D.J., TAKAHASHI H., TAKAHASHI T., TANAKA T., THAYER J.B., THAYER J.G., THOMPSON D.J., TIBALDO L., TORRES D.F., TRAMACERE A., UCHIYAMA Y., USHER T.L., VASILEIOU V., VILCHEZ N., VITALE V., WAITE A.P., WANG P., WINER B.L., WOOD K.S., YLINEN T., ZIEGLER M., BULLOCK J.S., KAPLINGHAT M. and MARTINEZ G.D.

Abstract (from CDS):

We report on the observations of 14 dwarf spheroidal galaxies (dSphs) with the Fermi Gamma-Ray Space Telescope taken during the first 11 months of survey mode operations. The Fermi telescope, which is conducting an all-sky γ-ray survey in the 20 MeV to >300 GeV energy range, provides a new opportunity to test particle dark matter models through the expected γ-ray emission produced by pair annihilation of weakly interacting massive particles (WIMPs). Local Group dSphs, the largest galactic substructures predicted by the cold dark matter scenario, are attractive targets for such indirect searches for dark matter because they are nearby and among the most extreme dark matter dominated environments. No significant γ-ray emission was detected above 100 MeV from the candidate dwarf galaxies. We determine upper limits to the γ-ray flux assuming both power-law spectra and representative spectra from WIMP annihilation. The resulting integral flux above 100 MeV is constrained to be at a level below around 10–9 photons/cm2/s. Using recent stellar kinematic data, the γ-ray flux limits are combined with improved determinations of the dark matter density profile in eight of the 14 candidate dwarfs to place limits on the pair-annihilation cross section of WIMPs in several widely studied extensions of the standard model, including its supersymmetric extension and other models that received recent attention. With the present data, we are able to rule out large parts of the parameter space where the thermal relic density is below the observed cosmological dark matter density and WIMPs (neutralinos here) are dominantly produced non-thermally, e.g., in models where supersymmetry breaking occurs via anomaly mediation. The γ-ray limits presented here also constrain some WIMP models proposed to explain the Fermi and PAMELA e + e – data, including low-mass wino-like neutralinos and models with TeV masses pair annihilating into muon-antimuon pairs.

Abstract Copyright: ∼

Journal keyword(s): dark matter - galaxies: dwarf - gamma rays: galaxies

Simbad objects: 16

goto Full paper

goto View the references in ADS

Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ESO 349-31 AG? 00 08 13.1536 -34 34 47.836   15.54   14.99   ~ 156 3
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
3 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
4 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
5 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
6 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
7 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
8 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
9 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
10 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
11 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
12 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
13 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
14 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
15 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
16 NAME Local Group GrG ~ ~           ~ 9325 0

To bookmark this query, right click on this link: simbad:objects in 2010ApJ...712..147A and select 'bookmark this link' or equivalent in the popup menu