8 th jan, 2009 @ nuhorizons, hri, allahabad atsushi watanabe (harish-chandra research institute) in...
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Ultra-high Energy Neutrinos and Ultra-high Energy Neutrinos and Slow Jets of Core Collapse SupernovaeSlow Jets of Core Collapse Supernovae
8th Jan, 2009 @ NuHoRIzons, HRI, Allahabad
Atsushi Watanabe(Harish-Chandra Research Institute)
In collaboration with Raj Gandhi (HRI) Abhijit Samanta (HRI)
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Cosmic neutrinos Cosmic neutrinos
• Masses, Mixings, CP violation• Flavor ratio on the earth
● Neutrinos are keys to go beyond the standard model
● Neutrinos can carry important information of astrophysical objects
● Cosmic ray sources
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Contents of talkContents of talk
● The neutrino flux from charmed meson is important at high-energy range
[Enberg, Reno, Sarcevic, 08’]
What are its implications in high-energy neutrino observation ?
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Contents of talkContents of talk
• Active Galactic Nuclei (AGN)• Gamma Ray Burst (GRB)• Core collapse supernovae (Slow jets)
[Halzen, 07’]
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Slow jet model of core collapse supernovaeSlow jet model of core collapse supernovae
[Razzaque, Mesaros, Waxman, 05’]• Jetted SN hypothesis Supernovae ⇔ GRB
Core collapse of massive stars resulting in a relativistic fireball jetwhich breaks through the stellar envelope is a widely discussed scenario for gamma ray burst production.
Much more frequent than GRB
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Slow jet model of core collapse supernovaeSlow jet model of core collapse supernovae
• Diffuse flux is small• But point sources near
our galaxy are feasible
SN rate in these is ~ 0.1 per year
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M82
NGC253
3.2 Mpc
2.5 Mpc
-25°
+69°
Slow jet model of core collapse supernovaeSlow jet model of core collapse supernovae
SN rate in these is ~ 0.1 per yearBeam effect: 1/5
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Charmed mesonsCharmed mesons
• Short lived - “prompt”
The probability that pion and kaon interact with environment increase with increasing energy.
Even a small fraction of short-lived particle Can give the dominant contribution at high energy.
[Thunman, Ingelman, Gondolo, 95’]
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The jet co-moving frame and the earth frameThe jet co-moving frame and the earth frame
[Enberg, Reno, Sarcevic, 08’]
Flux in jet-comving frame
Flux in the earth frame
Diffuse flux in the earth frame
We have chosen RMW pion flux as a basis to fix the flux scale
Summing over fluencesfrom all SNe(Star formation rate, jet fraction …)
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pion-RMW
Results (diffuse flux from D decay)Results (diffuse flux from D decay)
D-ERS
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Point sources (up-going muon events)Point sources (up-going muon events)
pion-RMW
D-ERS
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Point sources (down-going muon events)Point sources (down-going muon events)
D-ERS
D-ERS(electron)
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Summary and outlookSummary and outlook
• We have explored the slow jet supernovae model with charmed-meson neutrino flux.• It is found that the event rate is low for diffuse flux.
• But the neutrinos form the point sources near our galaxy can be received by KM3
scale detector.
・ The event rate for the Glashow resonance is small.
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Summary and outlookSummary and outlook
・ Tau events ?
・ Other sources ( AGN, GRB …)
“Double bang events”
[Learned, Pakvasa, 94’]
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AppendixAppendix
Assuming that the jet durationis a few second, these agree wellexcept the high-energy tail.