2010ApJ...710..634A

Query : 2010ApJ...710..634A

2010ApJ...710..634A - Astrophys. J., 710, 634-647 (2010/February-2)

MAGIC gamma-ray telescope observation of the Perseus cluster of galaxies: implications for cosmic rays, dark matter, and NGC 1275.

ALEKSIC J., ANTONELLI L.A., ANTORANZ P., BACKES M., BAIXERAS C., BALESTRA S., BARRIO J.A., BASTIERI D., BECERRA GONZALEZ J., BEDNAREK W., BERDYUGIN A., BERGER K., BERNARDINI E., BILAND A., BOCK R.K., BONNOLI G., BORDAS P., BORLA TRIDON D., BOSCH-RAMON V., BOSE D., BRAUN I., BRETZ T., BRITZGER D., CAMARA M., CARMONA E., CAROSI A., COLIN P., COMMICHAU S., CONTRERAS J.L., CORTINA J., COSTADO M.T., COVINO S., 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., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., ELSAESSER D., ERRANDO M., FERENC D., FONSECA M.V., FONT L., GALANTE N., GARCIA LOPEZ R.J., GARCZARCZYK M., GAUG M., GODINOVIC N., HADASCH D., HERRERO A., HILDEBRAND D., HOHNE-MONCH D., HOSE J., HRUPEC D., HSU C.C., JOGLER T., KLEPSER S., KRAHENBUHL 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., MIRANDA J.M., MIRZOYAN R., MIYAMOTO H., MOLDON J., MOLES M., MORALEJO A., NIETO D., NILSSON K., NINKOVIC J., ORITO R., OYA I., PAIANO S., PAOLETTI R., PAREDES J.M., PARTINI S., PASANEN M., PASCOLI D., PAUSS F., PEGNA R.G., PEREZ-TORRES M.A., PERSIC M., PERUZZO L., PRADA F., PRANDINI E., PUCHADES N., PULJAK I., REICHARDT I., RHODE W., RIBO M., RICO J., RISSI M., RUGAMER S., SAGGION A., SAITO T.Y., SALVATI M., SANCHEZ-CONDE M.A., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHAYDUK M., SHORE S.N., SIERPOWSKA-BARTOSIK A., SILLANPAA A., SITAREK J., SOBCZYNSKA D., SPANIER F., SPIRO S., STAMERRA A., STEINKE B., STRUEBIG J.C., SURIC T., TAKALO L., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., TORRES D.F., VANKOV H., WAGNER R.M., ZABALZA V., ZANDANEL F., ZANIN R., ZAPATERO J. (The MAGIC Collaboration), PFROMMER C., PINZKE A., ENSSLIN T.A., INOUE S. and GHISELLINI G.

Abstract (from CDS):

The Perseus galaxy cluster was observed by the MAGIC Cherenkov telescope for a total effective time of 24.4 hr during 2008 November and December. The resulting upper limits on the γ-ray emission above 100 GeV are in the range of 4.6-7.5x10–12/cm2/s for spectral indices from -1.5 to -2.5, thereby constraining the emission produced by cosmic rays, dark matter annihilations, and the central radio galaxy NGC 1275.
Result. are compatible with cosmological cluster simulations for the cosmic-ray-induced γ-ray emission, constraining the average cosmic ray-to-thermal pressure to <4% for the cluster core region (<8% for the entire cluster). Using simplified assumptions adopted in earlier work (a power-law spectrum with an index of -2.1, constant cosmic ray-to-thermal pressure for the peripheral cluster regions while accounting for the adiabatic contraction during the cooling flow formation), we would limit the ratio of cosmic ray-to-thermal energy to ECR/Eth< 3%. Improving the sensitivity of this observation by a factor of about 7 will enable us to scrutinize the hadronic model for the Perseus radio mini-halo: a non-detection of γ-ray emission at this level implies cosmic ray fluxes that are too small to produce enough electrons through hadronic interactions with the ambient gas protons to explain the observed synchrotron emission. The upper limit also translates into a level of γ-ray emission from possible annihilations of the cluster dark matter (the dominant mass component) that is consistent with boost factors of ∼104 for the typically expected dark matter annihilation-induced emission. Finally, the upper limits obtained for the γ-ray emission of the central radio galaxy NGC 1275 are consistent with the recent detection by the Fermi-LAT satellite. Due to the extremely large Doppler factors required for the jet, a one-zone synchrotron self-Compton model is implausible in this case. We reproduce the observed spectral energy density by using the structured jet (spine-layer) model which has previously been adopted to explain the high-energy emission of radio galaxies.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters: individual: Perseus - gamma rays: general

Simbad objects: 9

goto Full paper

goto View the references in ADS

Number of rows : 9
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 ACO 85 ClG 00 41 36.21 -09 19 30.4           ~ 974 0
2 ACO 426 ClG 03 19 47.6 +41 30 54           ~ 2508 1
3 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
4 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1388 1
5 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
6 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
7 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
8 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
9 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0

To bookmark this query, right click on this link: simbad:objects in 2010ApJ...710..634A and select 'bookmark this link' or equivalent in the popup menu