julia becker for the icecube collaboration august 2006
DESCRIPTION
Implications of neutrino flux limits. by the AMANDA experiment. Julia Becker for the IceCube collaboration August 2006. Contents. Detection principle and detector Analysis methods and results point sources stacking of point sources diffuse signal Interpretation of the diffuse signal - PowerPoint PPT PresentationTRANSCRIPT
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Julia Becker for the IceCube collaboration
August 2006
by the AMANDA experimentby the AMANDA experiment
Implications of neutrino flux Implications of neutrino flux limitslimits
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Contents
I. Detection principle and detectorII. Analysis methods and results
I. point sourcesII. stacking of point sourcesIII. diffuse signal
III. Interpretation of the diffuse signalIV. Summary
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
p …
N casc
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Amundsen-Scott South Pole Station
South PoleDome
Summer camp
AMANDA
road to work
1500 m
2000 m
[not to scale]
AMANDA/IceCube677 PMTs on 19 strings
Cherenkov light
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Detection strategies
AMANDA/IceCube FoV: northern hemisphere
Point source searches – significance map ?clustering of neutrinosidentified photon sources
Stacking strategy – sum signal of point sources of same source classSearch for a diffuse signal: use complete northern hemisphere
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Other strategies Cascade analyses Transient sources:
• Flares of permanent objects• Gamma Ray Bursts stacking approach,
temporal clustering• SGR 1860-20
Dark matter searches• WIMPs• Magnetic Monopoles
CR composition (IceTop) Atmospheric muons, charm contribution Acoustic detection
gre
at
bu
t to
o s
hort
tim
e!
Talk Elisa Resconi
Poster Juande ZornozaPoster Brennan Hughey
Poster Tom Gaisser
Talks Doug Cowen, Ty DeYoung
Talks Stephan Hundertmark, Justin Vandenbroucke
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Search for single point sources
90% confidence level flux upper limits for the northern hemisphere in 0.5 deg bins (15% systematic error included)
Event map – 4282 events in 5 years (2000-2004) –effective time: 1001 daysNo significant signal – Limit map
preliminary!
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Stacking of AGN GeV blazars (EGRET) – GeV Unidentified EGRET sources – unidGeV Infrared sources – IR HAEO-A-detected keV sources – keV(H) ROSAT-detected keV sources – keV(R) TeV blazars - TeV Compact Steep Spectrum and Giga-Hertz
peaked sources – CSS/GpS FR-I galaxies including M87 – FR-I(M) FR-I galaxies without M87 – FR-I FR-II galaxies – FR-II Radio-weak quasars – QSO
preliminary!
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Energy spectrum (2000)
High energy limit (2000-2003)
Hill et al., Neutrino 2006
Diffuse energy spectrum&limit
112
82 108.8
srsGeVcm
E
Nellen
Poster Jessica Hodges
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
X-ray AGN (I)Nellen,Mannheim&Bierm
ann Phys.Rev.D (1993)
Stecker&Salamon Space Science Rev.
(1996)
Limits&IceCube sensitivity
Hill et al., Neutrino 2006
Limit strongly restrictiveFavoring IC scenario
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Model-dependence of limit
Not always E-2 Energy range of limits change with spectral
index , E-
Higher energies for flatter spectra
E-1E-3
E-2
log(E/GeV)
log
(dN
/d
E*E
2)
preliminary!
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
X-ray AGN (II)
Nellen,Mannheim&Biermann
Phys.Rev.D (1993)
Stecker&Salamon Space Science Rev.
(1996)
Limits&IceCube sensitivity
Hill et al., Neutrino 2006Limit adjusted to model1 order of magnitude below flux
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
= +(TeV)=
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
= +(TeV)=
z=0.3
z=1 ~10
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
TeV Blazars – spectrum
Total diffuse flux:
Neutrino flux up to a certain redshift:
Absorption factor:
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Absorption factor
conservative estimate:
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Maximum contribution
astro-ph/0607427
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
Summary Point source analysis no significant
signal Source stacking: increase of sensitivity
limits to flux from source classes Diffuse flux: strong constraints
• X-ray AGN: most likely X-rays from Inverse Compton
• TeV-sources: limit to contribution of TeV-photon observable sources
• Limits adjusted to different flux models Very near future (9 strings working
already!)
08/2006 Julia Becker, Universität Dortmund TeV particle astrophysics, Madison
IceCube!South Pole
Station
Skiway
IceCube footprint
(In-ice, IceTop)
SPASE arrayAMANDAGeographic
South Pole
Photograph: Forest Banks Posters Jon Dumm, Hagar LandsmanTalk Kael Hanson