2009ApJ...697.1299A

Query : 2009ApJ...697.1299A

2009ApJ...697.1299A - Astrophys. J., 697, 1299-1304 (2009/June-1)

Upper limits on the VHE gamma-ray emission from the Willman 1 satellite galaxy with the MAGIC telescope.

ALIU E., ANDERHUB H., ANTONELLI L.A., ANTORANZ P., BACKES M., BAIXERAS C., BALESTRA S., BARRIO J.A., BARTKO H., BASTIERI D., BECERRA GONZALEZ J., BECKER J.K., BEDNAREK W., BERGER K., BERNARDINI E., BILAND A., BOCK R.K., BONNOLI G., BORDAS P., BORLA TRIDON D., BOSCH-RAMON V., BOSE D., BRETZ T., BRITVITCH I., CAMARA M., CARMONA E., COMMICHAU S., CONTRERAS J.L., CORTINA J., COSTADO M.T., COVINO S., CURTEF V., DAZZI F., DE ANGELIS A., DE CEA DEL POZO E., DE LOS REYES R., DE LOTTO B., DE MARIA M., DE SABATA F., DELGADO MENDEZ C., DOMINGUEZ A., DORNER D., DORO M., ELSAESSER D., ERRANDO M., FERENC D., FERNANDEZ E., FIRPO R., FONSECA M.V., FONT L., GALANTE N., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GOEBEL F., HADASCH D., HAYASHIDA M., HERRERO A., HOHNE-MONCH D., HOSE J., HSU C.C., HUBER S., JOGLER T., KRANICH D., LA BARBERA A., LAILLE A., LEONARDO E., LINDFORS E., LOMBARDI S., LONGO F., LOPEZ M., LORENZ E., MAJUMDAR P., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARIOTTI M., MARTINEZ M., MAZIN D., MEUCCI M., MEYER M., MIRANDA J.M., MIRZOYAN R., MOLDON J., MOLES M., MORALEJO A., NIETO D., NILSSON K., NINKOVIC J., OTTE N., OYA I., PAOLETTI R., PAREDES J.M., PASANEN M., PASCOLI D., PAUSS F., PEGNA R.G., PEREZ-TORRES M.A., PERSIC M., PERUZZO L., PRADA F., PRANDINI E., PUCHADES N., RHODE W., RIBO M., RICO J., RISSI M., ROBERT A., RUGAMER S., SAGGION A., SAITO T.Y., SALVATI M., SANCHEZ-CONDE M., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHWEIZER T., SHAYDUK M., SHINOZAKI K., SHORE S.N., SIDRO N., SIERPOWSKA-BARTOSIK A., SILLANPAA A., SITAREK J., SOBCZYNSKA D., SPANIER F., STAMERRA A., STARK L.S., TAKALO L., TAVECCHIO F., TEMNIKOV P., TESCARO D., TESHIMA M., TLUCZYKONT M., TORRES D.F., TURINI N., VANKOV H., WAGNER R.M., WITTEK W., ZABALZA V., ZANDANEL F., ZANIN R. and ZAPATERO J.

Abstract (from CDS):

We present the result of the observation of the ultrafaint dwarf galaxy Willman 1 performed with the 17 m MAGIC telescope during 15.5 hr between March and May 2008. No significant γ-ray emission was found. We derived upper limits of the order of 10–12 ph/cm2/s on the integral flux above 100 GeV, which we compare with predictions from several of the established neutralino benchmark models in the mSUGRA parameter space. The neutralino annihilation spectra are defined after including the recently quantified contribution of internal bremsstrahlung from the virtual sparticles that mediate the annihilation. Flux boost factors of three orders of magnitude are required even in the most optimistic scenario to match our upper limits. However, uncertainties in the dark matter intrinsic and extrinsic properties (e.g., presence of substructures, Sommerfeld effect) may significantly reduce this gap.

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

Simbad objects: 6

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Number of rows : 6
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 M 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
3 NAME UMa Region reg 11 00 +50.0           ~ 333 0
4 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
5 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
6 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2

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