Shock breakout caught on camera
Article Abstract:
Observations with NASA's satellite-based Swift telescope of the shock breakout of a supernova SN 2006aj/gamma-ray burst GRB060218, sending out a slightly aspherical shockwave typical of a supernova and a jet-like stream of material characteristic of a GRB, suggest that GRBs and supernovae have a common origin in a collapsing Wolf-Rayet star. The object could have a highly magnetized compact neutron star known as magnetar at its core, which supplies the magnetic energy to produce both the highly relativistic jet and the mildly relativistic expanding shockwave.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2006
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The thermal imprint of galaxy formation on x-ray clusters
Article Abstract:
Similarities in the structure of galaxy clusters formed via hierarchical clustering have been revealed. X-ray-emitting clusters seem fainter in x-rays than predicted by hierarchical formation models. The discrepancies are shown to occur due to the higher entropy of the hot diffuse intracluster gas close to the centre of the cluster. The excess entropy may be a relic of winds generated by supernovae, which enriched the medium with elements heavier than helium.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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Discovery of a supernova explosion at half the age of the Universe
Article Abstract:
Large numbers of distant supernovae can now be found, and their redshifts and apparent brightnesses can be measured. The most distant spectroscopically confirmed supernova is reported, which is similar to nearby, recent type Ia supernovae. The new measurements indicate a low-mass-density universe.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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