Julia becker for the icecube collaboration august 2006
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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

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Julia Becker for the IceCube collaboration August 2006

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Julia becker for the icecube collaboration august 2006

Implications of neutrino flux limits

by the AMANDA experiment

Julia Becker for the IceCube collaboration

August 2006

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Contents

Contents

  • Detection principle and detector

  • Analysis methods and results

    • point sources

    • stacking of point sources

    • diffuse signal

  • Interpretation of the diffuse signal

  • Summary

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Julia becker for the icecube collaboration august 2006

p gD…pn...

N ...m, casc

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Amanda icecube

677 PMTs on 19 strings

Cherenkov light

South Pole

Dome

road to work

AMANDA

Summer camp

1500 m

Amundsen-Scott South Pole Station

2000 m

[not to scale]

AMANDA/IceCube

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Detection strategies

Stacking strategy – sum signal of point sources of same source class

Search for a diffuse signal: use complete northern hemisphere

Detection strategies

Point source searches – significance map ?clustering of neutrinos

identified photon sources

AMANDA/IceCube FoV:

northern hemisphere

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Other strategies

Other strategies

Talks Doug Cowen, Ty DeYoung

  • 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

Talk Elisa Resconi

Poster Brennan Hughey

Poster Juande Zornoza

great but too short time!

Poster Tom Gaisser

Talks Stephan Hundertmark, Justin Vandenbroucke

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Search for single point sources

Search for single point sources

Event map – 4282 events in 5 years (2000-2004) –effective time: 1001 days

No significant signal – Limit map

90% confidence levelflux upper limits for the northern hemisphere

in 0.5 deg bins (15% systematic error included)

preliminary!

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Stacking of agn

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!

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Diffuse energy spectrum limit

Energy spectrum

(2000)

High energy limit

(2000-2003)

Hill et al., Neutrino 2006

Nellen

Diffuse energy spectrum&limit

Poster Jessica Hodges

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


X ray agn i

X-ray AGN (I)

Nellen,Mannheim&Biermann

Phys.Rev.D (1993)

Stecker&Salamon

Space Science Rev. (1996)

Limits&IceCube sensitivity

Hill et al., Neutrino 2006

Limit strongly restrictive

Favoring IC scenario

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

Model-dependence of limit

E-1

E-3

log(dN/dE*E2)

E-2

log(E/GeV)

preliminary!

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


X ray agn ii

X-ray AGN (II)

Nellen,Mannheim&Biermann

Phys.Rev.D (1993)

Stecker&Salamon

Space Science Rev. (1996)

Limits&IceCube sensitivity

Hill et al., Neutrino 2006

  • Limit adjusted to model

  • 1 order of magnitude

    below flux

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Julia becker for the icecube collaboration august 2006

=  +g(TeV)

= 

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Julia becker for the icecube collaboration august 2006

=  +g(TeV)

z=1 ~10

= 

z=0.3

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Tev blazars spectrum

TeV Blazars –  spectrum

  • Total diffuse  flux:

  • Neutrino flux up to a certain redshift:

  • Absorption factor:

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Absorption factor

Absorption factor

conservative estimate:

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Maximum contribution

Maximum contribution

astro-ph/0607427

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Summary

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!)

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


Icecube

IceCube!

South Pole Station

SPASE array

AMANDA

Geographic South Pole

IceCube footprint(In-ice, IceTop)

Talk Kael Hanson

Skiway

Posters Jon Dumm, Hagar Landsman

Photograph: Forest Banks

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison


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