the antares neutrino telescope and its dark matter capabilities jürgen hößl, universität...

The ANTARES Neutrino Telescope and its Dark Matter Capabilities

Jürgen Hößl,Universität Erlangen,on behalf of theANTARES Collaboration

Edinburgh, September 2004

ANTARES NeutrinoTelescope

• 12 lines• 25 storeys / line• 3 PMTs / storey

350 m

100 m

Junctionbox

40 km toshore

buoy

muon

65 – 70 m

ANTARES Site

Submarine Cable

-2500m

La Seyne sur Mer

Institut Michel Pacha

Shore Station

AMANDASouth Pole

0.5 sr instantaneous common view1.5 sr common view per day

ANTARES43o North

2/3 of time: Galactic Centre

Sky Coverage

Angular Resolution

for high energies:

(Quality of water!)

ANTARES Collaboration

IFICValencia

IFREMER, BrestDAPNIA, SaclayIReS, Strasbourg MulhouseCPPM MarseilleIFREMER,ToulonCOM, MarseilleOCA, Nice

ITEPMosco

wSheffieldLeeds

NIKHEFAmsterdam

GenovaBari

CataniaRoma

Erlangen

LNSPisa

Bologna

Scientific Programme

Neutralino searchAnnihilation at centreof Earth, Sun, Galaxy

Search for galactic/extragalactic sources

SN remnants, Galactic microquasarsAGN, GRB, …

+ oceanography, biology, seismology

Pulsars,Plerions

Supernova Remnants

Active Galactic Nuclei (Quasars, Blazars)

Microquasars

Cosmic Particle Accelerators

Gamma Ray Bursts

Dark Matter

Rotation of galaxies Microwave backgroundGravitational lenses

Search for Neutralino Annihilation

WIMP loses energy by elastic interaction if v< vescape =>capture

capture + annihilation balance => constant density in core

W

W

bc

bc

b~

hard spectrum ( if M<MW) soft spectrum

Gravitational capture of in Earth, Sun, Galactic Centre

Annihilation:+ +

- -

-

+

Dark Matter Sensitivitysearch conearound source(depends onNeutralino mass)

number of atmos-pheric backgroundevents

90 % upper limiton signal events

muon /neutrinoflux limit

mSUGRAparameter scan

muon/neutrinoflux prediction

comparison

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

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

(J.Lundberg and J.Edsjö, astro-ph/0401113)Large uncertainties

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)

from G. Bertone et al.astro-ph/0403322

EGRET signal neutrino flux:

(e.g. P. Gondolo and J. Silk, Phys. Rev. Lett. 83(1999)1719 )

orders of magnitude flux uncertainties!

Dec 2002

100m

100m

LASER Beacon

LED beacon

Mini Instrumentation Line Feb 2003

Prototype Sector LineDec 2002

12m

100m

to shoreOct 2001

Status ANTARES

Prototype Sector Line: Nov 2002

PSL & MIL Operation in 2003

Sea operations: - deployment/connections/recovery without problemsLine operations: - power distribution - data transfer to shore (130 GByte) - remote control without problemsminor 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 Background10% burst fraction Less than 1% burst fraction

10min 10min

K + bioluminescence 40

bursts

baseline

Long Term Background

ANTARES Summary and Future

Sector Line deploymentSector Line deployment

Deployment of lines 1 to 12Deployment of lines 1 to 12and operationand operation

in 2007 in 2007 12 string detector12 string detector

completecomplete

OperationOperationof Sector of Sector LineLine

Sector Line connectionSector Line connection

Junction box deploymentJunction box deployment

Mini Instrumentation Line deploymentMini Instrumentation Line deployment

Mini Instrumentation Line with Optical Mini Instrumentation Line with Optical Modules: deployment and operationModules: deployment and operation

The End