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