Search results for "Crab Nebula"

showing 2 items of 12 documents

Dust Envelope in Young Supernova Remnants

1974

As stated by Hoyle and Wickramasinghe (1970), hereafter referred to as HW, a significant fraction of the mass ejected by exploding supernovae may condense into solid particles during the expansion phase following explosion. Hence, observable effects on supernova light curves are to be expected.

PhysicsSupernovaCrab NebulaAstrophysics::High Energy Astrophysical PhenomenaAstrophysics::Solar and Stellar AstrophysicsAstronomyObservableAstrophysicsExpansion phaseNear-Earth supernovaLight curveEnvelope (waves)Luminosity
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SPI/INTEGRAL in-flight performance

2003

The SPI instrument has been launched on-board the INTEGRAL observatory on October 17, 2002. SPI is a spectrometer devoted to the sky observation in the 20 keV-8 MeV energy range using 19 germanium detectors. The performance of the cryogenic system is nominal and allows to cool the 19 kg of germanium down to 85 K with a comfortable margin. The energy resolution of the whole camera is 2.5 keV at 1.1 MeV. This resolution degrades with time due to particle irradiation in space. We show that the annealing process allows the recovery of the initial performance. The anticoincidence shield works as expected, with a low threshold at 75 keV, reducing the GeD background by a factor of 20. The digital …

media_common.quotation_subjectAstrophysics::High Energy Astrophysical PhenomenaFOS: Physical scienceschemistry.chemical_elementGermaniumAstrophysicsUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsGamma-rayObservatoryinstrument observations [gamma-ray]Observationsmedia_commonPhysicsSpectrometerINTEGRAL/SPIAstrophysics (astro-ph)DetectorAstronomy and AstrophysicsInstrumentDead timeGalactic planeINTEGRAL/SPI [space telescope]:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]Gamma-ray ; Instrument ; Observations ; Space telescope ; INTEGRAL/SPIComputational physicsCrab NebulachemistrySpace and Planetary ScienceSkySpace telescopeUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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