منابع مشابه
Neutrino Mixing , Decays and Supernova 1987 A
We discuss the evolution of neutrino beams in the presence of both flavor mixing and decays, and we comment on the implications of the supernova 1987A observations for neutrino mixings and lifetimes. Although the implied stability ~of the electron neutrino severely constrains particle physics models with neutrino decay, it may not rule out the possibility that neutrino decay accounts for the di...
متن کامل2 00 7 Chandra Observations of Supernova 1987 A
We have been monitoring Supernova (SN) 1987A with Chandra X-Ray Observatory since 1999. We present a review of previous results from our Chandra observations, and some preliminary results from new Chandra data obtained in 2006 and 2007. High resolution imaging and spectroscopic studies of SN 1987A with Chandra reveal that X-ray emission of SN 1987A originates from the hot gas heated by interact...
متن کاملThe diffuse supernova neutrino flux , supernova rate and SN 1987 A Cecilia
I calculate the diffuse flux of electron antineutrinos from all supernovae using the information on the neutrino spectrum from SN1987A and the information on the rate of supernovae from direct supernova observations. The interval of flux allowed at 99% confidence level is ∼ 0.05−0.35 cm−2s−1 above the SuperKamiokande (SK) energy cut of 19.3 MeV. This result is at least a factor of ∼ 4 smaller t...
متن کاملSe p 19 98 Supernova 1987 A : Rotation and a Binary Companion
Received ; accepted – 2 – ABSTRACT In this paper we provide a possible link between the structure of the bipolar nebula surrounding SN1987A and the properties of its progenitor star. A Wind Blown Bubble (WBB) scenario is employed, in which a fast, tenuous wind from a Blue Supergiant expands into a slow, dense wind, expelled during an earlier Red Supergiant phase. The bipolar shape develops due ...
متن کاملOn the Emergence and Discovery of Hot Spots in Supernova Remnant 1987 A 1
We present the discovery of several new regions of interaction between the ejecta and equatorial circumstellar ring of SN1987A, an interaction leading to a much expanded development of the supernova remnant. We also trace the development of the first such “hot spot,” discovered in 1997, back to 1995. Later hot spots seem to have emerged by early 1999. We discuss mechanisms for the long delay be...
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ژورنال
عنوان ژورنال: Europhysics News
سال: 1989
ISSN: 0531-7479,1432-1092
DOI: 10.1051/epn/19892001013