SN1987A levels off
نویسندگان
چکیده
منابع مشابه
Saxion Emission from SN1987A
We study the possibility of emission of the saxion, a superpartner of the axion, from SN1987A. The fact that the observed neutrino pulse from SN1987A is in excellent agreement with the current theory of supernovae places a strong bound on the energy loss into any non-standard model channel, therefore enabling bounds to be placed on the decay constant, fa, of a light saxion. The low-energy coupl...
متن کاملNeutrino Events from Sn1987a Revisited * * *
The e − and e + energy spectra from the SN1987A Supernova neutrino burst interactions are calculated and compared to the observed spectra in Kamiokande-II and IMB experiments. Neutrino oscillations in Supernova and regeneration effects in the Earth, for four combinations of neutrino mass hierarchy (Direct/Inverted) and the value of the mixing angle θ 13 (Large/Small), are taken into account. Th...
متن کاملImaging observations of SN1987A at gammaray energies
The Caltech imaging q-ray telescope was launched by balloon from Alice Springs, NT, Australia for observations of SN1987A during the period 18.80-18.87 November 1987 UT. The preliminary results presented here are derived from 8200 seconds of instrument livetime on the supernova and 2500 seconds on the Crab Nebula and pulsar at a float altitude of 37 kin. We have obtained the first images of the...
متن کاملThe X-ray Remnant of SN1987A
We present high resolution Chandra observations of the remnant of SN1987A in the Large Magellanic Cloud. The high angular resolution of the Chandra X-ray Observatory (CXO) permits us to resolve the X-ray remnant. We find that the remnant is shell-like in morphology, with X-ray peaks associated with some of the optical hot spots seen in HST images. The X-ray light curve has departed from the lin...
متن کاملSpin-Flavour Oscillations and Neutrinos from SN1987A
The neutrino signal from SN1987A is analysed with respect to spin-flavour oscillations between electron antineutrinos, ν̄e, and muon neutrinos, νμ, by means of a maximum likelihood analysis. Following Jegerlehner et al. best fit values for the total energy released in neutrinos, Et, and the temperature of the electron antineutrino, Tν̄e , for a range of mixing parameters and progenitor models are...
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ژورنال
عنوان ژورنال: Nature
سال: 1990
ISSN: 0028-0836,1476-4687
DOI: 10.1038/343207b0