exploring the crab nebula with the hubble, chandra and fermi space telescopes
DESCRIPTION
Roger Blandford KIPAC Stanford. Exploring the Crab Nebula with the Hubble, Chandra and Fermi Space Telescopes. Anasazi Indians. Charles Messier. Sam Okoye discovers compact radio source. Franco Pacini predicts Crab Nebula Powered by Neutron Star . Jocelyn Bell Discovers Pulsars. - PowerPoint PPT PresentationTRANSCRIPT
NASM 125 ii 2011
Exploring the Crab Nebula with the
Hubble, Chandra and FermiSpace Telescopes
Roger BlandfordKIPAC
Stanford
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Anasazi Indians
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Charles Messier
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Sam Okoye discovers compact radio source
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Franco Pacini predictsCrab Nebula Powered
by Neutron Star
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Jocelyn Bell Discovers Pulsars
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John Bahcall (1934-2005)
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AstrophysicistAstronomical LeaderMentor to Young ScientistsChampion of Hubble Space Telescope
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Hubble Space Telescope
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Chandra X-ray Telescope
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High Energy Astronomy! VERITAS/H.E.S.S.
LIGO
Ice Cube
eV keV MeV GeV TeV PeV EeV ZeV
Cosmic Rays
Gamma-Rays
X
Electromagnetic waves comprise particles called Photons
Cosmic rays comprise mainly Protons and Electrons
Radio
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Fermi(the scientist
and the telescope)
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The Pulsing g-ray Sky
Pulses at1/10th true rate
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H.E.S.S.
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Supernova Explosion
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Supernova 1987a in Magellanic Cloud
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Crab Nebula at Different Wavelengths
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Optical and X-rays Combined
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The Entire Spectrum
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TeV
SynchrotronRadiation
ComptonScattering
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Synchrotron Radiation
Maximum Synchrotron Photon Energy ~ 100 MeV
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~0.01 Gauss 10 keV
10 TeV
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Compton Scattering
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0.1 eV Infrared Photon
10 TeV Electron
5 TeV Electron
5 TeV Gamma-rayPhoton
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Neutron Star
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Wilson
• Mass: 1.5 suns• Radius: 10 km • Density: million, billion x
water• Rotation Rate: 30 per
second• Magnetic Field: 1 trillion
Gauss
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Crab Pulsar
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Faraday’s Disk
Magnet
Conducting DiskCrank
Voltage: 50 PetaVoltsCurrent: 300 TeraAmpsPower: 100,000 Suns
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The Restless Crab
Hester25 ii 2011
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Fermi Flares
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Spectral Changes
September Flare4 day variation
SynchrotronRadiation
Compton Scattering
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SynchrotronRadiation
Limit
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Where is the Flare?
25 ii 2011 Jet Torus
Pulsar
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Let’s Keep Exploring the Crab Nebula
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Thank You