13,290 research outputs found
High-energy emissions from neutron star mergers
In 2017, LIGO-Virgo collaborations reported detection of the first neutron
star merger event, GW170817, which is accompanied by electromagnetic
counterparts from radio to gamma rays. Although high-energy neutrinos were not
detected from this event, mergers of neutron stars are expected to produce such
high-energy particles. Relativistic jets are launched when neutron stars merge.
If the jets contain protons, they can emit high-energy neutrinos through
photomeson production. In addition, neutron star mergers produce massive and
fast ejecta, which can be a source of Galactic high-energy cosmic rays above
the knee. We briefly review what we learned from the multi-messenger event,
GW170817, and discuss prospects for multi-messenger detections and hadronic
cosmic-ray production related to the neutron star mergers.Comment: 9 pages, 4 figures, 5 tables, conference proceedings of UHECR 201
Space environmental considerations for a long-term cryogenic storage vessel
Information is given on the kind of protection that is needed against impact and perforation of a long-term cryogenic storage vessel in space by meteoroids and space debris. The long-term effects of the space environment on thermal control surfaces and coatings, and the question of whether the insulation and thermal control surfaces should be encased in a vacuum jacket shell are discussed
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