julia becker for the icecube collaboration august 2006
Download
Skip this Video
Download Presentation
Julia Becker for the IceCube collaboration August 2006

Loading in 2 Seconds...

play fullscreen
1 / 19

Julia Becker for the IceCube collaboration August 2006 - PowerPoint PPT Presentation


  • 126 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Julia Becker for the IceCube collaboration August 2006' - doris


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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

slide3
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

slide13
=  +g(TeV)

= 

Julia Becker, Universität Dortmund TeV particle astrophysics, Madison

slide14
=  +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

ad