The ANTARES Neutrino Telescope and its Dark Matter Capabilities Jürgen Hößl, Universität Erlangen, on behalf of the ANTARES Collaboration Edinburgh, September 2004

ANTARES NeutrinoTelescope buoy 350 m 12 lines 25 storeys / line 3 PMTs / storey 40 km to shore 100 m Junction box muon 65 – 70 m

ANTARES Site Shore Station Institut Michel Pacha -2500m Submarine Cable La Seyne sur Mer Institut Michel Pacha Shore Station

2/3 of time: Galactic Centre Sky Coverage ANTARES 43o North 2/3 of time: Galactic Centre Dateien AMANDA South Pole Dateien 0.5 p sr instantaneous common view 1.5 p sr common view per day

Angular Resolution sq < 0.2o m n n m for high energies: (Quality of water!)

ANTARES Collaboration Erlangen NIKHEF Amsterdam ITEP Moscow Sheffield Leeds IFREMER, Brest DAPNIA, Saclay IReS, Strasbourg Mulhouse CPPM Marseille IFREMER,Toulon COM, Marseille OCA, Nice Genova Bologna Bari IFIC Valencia Pisa Roma Catania LNS

Scientific Programme Neutralino search Annihilation at centre of Earth, Sun, Galaxy cc  n .... Search for galactic/extragalactic n sources SN remnants, Galactic microquasars AGN, GRB, … + oceanography, biology, seismology

Cosmic Particle Accelerators Gamma Ray Bursts Supernova Remnants Pulsars, Plerions Active Galactic Nuclei (Quasars, Blazars) Microquasars

Dark Matter Microwave background Gravitational lenses Rotation of galaxies Gravitational lenses

Search for Neutralino Annihilation Gravitational capture of c in Earth, Sun, Galactic Centre c c WIMP loses energy by elastic interaction if v< vescape =>capture capture + annihilation balance => constant density in core Annihilation: Wm m c c+ + + c bcm m - ~ b - - c bcm m + hard spectrum ( if Mc<MW) soft spectrum

Dark Matter Sensitivity search cone around source (depends on Neutralino mass) number of atmos- pheric background events 90 % upper limit on signal events mSUGRA parameter scan comparison muon/neutrino flux prediction muon /neutrino flux limit

WIMP Annihilation in Sun

WIMP Annihilation at Centre of the Earth - mass of Earth << mass of Sun possibly dramatic reduction of capture rate in Earth due to depletion of neutralino density by solar capture Large uncertainties (J.Lundberg and J.Edsjö, astro-ph/0401113) only small capture rate in the Earth annihilation rate and neutrino flux from Earth smaller than from Sun for ANTARES: search from Earth not competitive with search from Sun

WIMP Annihilation at Galactic Centre (GC) possibility to probe DM profile in Galactic Centre (contrary to direct searches) - uncertainties about DM profile: standard parametrisations give low neutrino fluxes from GC (e.g. Navarro, Frenk and White, Astrophys. J. 462(1996) 563 ) from G. Bertone et al. astro-ph/0403322

WIMP Annihilation at Galactic Centre (GC) but: possible enhancement of annihilation flux by orders of magnitude in the presence of a black hole (spike) (e.g. P. Gondolo and J. Silk, Phys. Rev. Lett. 83(1999)1719 ) EGRET g signal neutrino flux: from G. Bertone et al. astro-ph/0403322 orders of magnitude flux uncertainties!

Mini Instrumentation Line Feb 2003 Prototype Sector Line Dec 2002 12m 100m 100m LASER Beacon LED beacon Mini Instrumentation Line Feb 2003 Status ANTARES to shore Oct 2001 Dec 2002

Prototype Sector Line: Nov 2002

PSL & MIL Operation in 2003 Lot of data during 3 months of operation Sea operations: - deployment/connections/recovery without problems Line operations: - power distribution - data transfer to shore (130 GByte) - remote control minor problems: - distribution of the onshore synchronised clock signal failed due to broken fibre: manufacturer used inappropriate cable water leakage in Mini Instrumentation Line after 2 months under high pressure: mismatch of o-ring/hole size Lot of data during 3 months of operation

Optical Background Less than 1% burst fraction 10% burst fraction bursts baseline 10min 10min K + bioluminescence 40

Long Term Background

ANTARES Summary and Future _________________ 2002 2003 2004 2005 2006 2007 Operation of Sector Line Deployment of lines 1 to 12 and operation Mini Instrumentation Line with Optical Modules: deployment and operation Sector Line connection in 2007 12 string detector complete Mini Instrumentation Line deployment Sector Line deployment Junction box deployment

The End