Search for Neutrinos from Strong Variable Gamma Ray Sources
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Transcript of Search for Neutrinos from Strong Variable Gamma Ray Sources
Search for Neutrinos from Strong Variable Gamma Ray Sources
Wolfgang Rhode
Dortmund
Challenge
• 5 years of data taken with AMANDA
• Up to now:– no extraterrestric signal found– most interesting hint:
from coincidence analysis with HEGRA
The Sky in TeV-Light 2003 This plot could have
been made by telescopes
of a sensitivity of 1 single
HEGRA telescope
~ 5 variable sources
at the nothern hemisphere
AGN
FSRQ
/BL Lac
SSRQ
FR-II/FR-I
AMANDA II-AMANDA II--Sensitivity vs. -Sensitivity vs. Mrk 501 Gamma-Ray-FluxMrk 501 Gamma-Ray-Flux
Sensitivity of Sensitivity of 3 years of IceCube3 years of IceCube
AMANDA B10AMANDA B10
AMANDA II AMANDA II
Expected:1 < < 50 (KM)
M 87
Periode 1998/1999
83,4 Stunden
4,1 Sigma
Photons, Neutrinos & Protons from M87 ?
M 87
M87
AMANDA IIHEGRA
AMANDA
Fig1: Whipple data, Eth=600 GeV [2] Fig2: HEGRA data, Eth=1 TeV [1]
From the analysis of 1ES1959+650 we have learned, that by coincident observations a singificant background (time) reduction (factor 10-100) becomes possible.
GRB-analysis-like situation
Proposal
• Build (1–5) Atmopheric Cherenkov Telescopes, each roughly of the sensitivity of one of the old HEGRA telescopes.
• Set them up at locations of existing ACTs (northern hemisphere preferred).
• Operate them together with ACT collaborations.
What about HESS, MAGIC, VERITAS ?
• Possible: – (I) ACT looks on hotspots of the AMANDA/IceCube skymap
– (II) IceCube adds confirmed ACT sources to its search catalogue
• However:– New ACTs are very sensitive
• CRAB visible within minutes
• Long term observation of intense AGN not interesting
– New ACTs are optimized for low (< 1TeV) energies
will be done
Telescope locations
• Ontime is ~ 10%,
• weather conditions -> different locations
• MAGIC, VERITAS, HESS?, India???, ????– Telescopes could be operated by existing crews
• Observations around the clock possible
Telescope properties
• Mirror: 14 – 15 m2 – 5000 € / m2 ~ 75000 €
• Mount:– 75000 €
• Camera: 127 pixel, lightguide• Electronic within a box outside, container• Sum: 0,5 – 1 M€ / telescope• 1 – 6 telescopes needed (1,1*2,2*3, stereoscopic)• Help from MAGIC offered• Independend interest from HESS
Cheap alternatives?
• Where are the old HEGRA telescopes?
• 1 mount is still at La Palma, electronics might be found, camera might still be in Heidelberg, could work again within 4 months.
• 3 (?) Telescopes were handed over to US (BD), for high altitude tests.– Convince her to set them up at the VERITAS site?
Conclusion
• With comparably moderate expenses in terms of money and manpower, a significant improvement of the sensitvity can be reached.