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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 Presentation
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NASM 125 ii 2011
Exploring the Crab Nebula with the
Hubble, Chandra and FermiSpace Telescopes
Roger BlandfordKIPAC
Stanford
NASM 2
Anasazi Indians
25 ii 2011
NASM 3
Charles Messier
25 ii 2011
NASM 4
Sam Okoye discovers compact radio source
25 ii 2011
NASM 5
Franco Pacini predictsCrab Nebula Powered
by Neutron Star
25 ii 2011
NASM 6
Jocelyn Bell Discovers Pulsars
25 ii 2011
7
John Bahcall (1934-2005)
25 ii 2011 NASM
AstrophysicistAstronomical LeaderMentor to Young ScientistsChampion of Hubble Space Telescope
NASM 8
Hubble Space Telescope
25 ii 2011
NASM 9
Chandra X-ray Telescope
25 ii 2011
NASM 1025 ii 2011
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
NASM 1125 ii 2011
Fermi(the scientist
and the telescope)
NASM 12
The Pulsing g-ray Sky
Pulses at1/10th true rate
25 ii 2011
NASM 1325 ii 2011
H.E.S.S.
NASM 14
Supernova Explosion
25 ii 2011
Supernova 1987a in Magellanic Cloud
NASM 15
Crab Nebula at Different Wavelengths
25 ii 2011
NASM 16
Optical and X-rays Combined
25 ii 2011
NASM 17
The Entire Spectrum
25 ii 2011 Radio Gamma Rays
TeV
SynchrotronRadiation
ComptonScattering
NASM 18
Synchrotron Radiation
Maximum Synchrotron Photon Energy ~ 100 MeV
25 ii 2011
~0.01 Gauss 10 keV
10 TeV
NASM 19
Compton Scattering
25 ii 2011
0.1 eV Infrared Photon
10 TeV Electron
5 TeV Electron
5 TeV Gamma-rayPhoton
NASM 20
Neutron Star
25 ii 2011
Wilson
• Mass: 1.5 suns• Radius: 10 km • Density: million, billion x
water• Rotation Rate: 30 per
second• Magnetic Field: 1 trillion
Gauss
NASM 21
Crab Pulsar
25 ii 2011
NASM 2225 ii 2011
Faraday’s Disk
Magnet
Conducting DiskCrank
Voltage: 50 PetaVoltsCurrent: 300 TeraAmpsPower: 100,000 Suns
NASM 23
The Restless Crab
Hester25 ii 2011
NASM 24
Fermi Flares
25 ii 2011
NASM 25
Spectral Changes
September Flare4 day variation
SynchrotronRadiation
Compton Scattering
25 ii 2011
SynchrotronRadiation
Limit
NASM 26
Where is the Flare?
25 ii 2011 Jet Torus
Pulsar
NASM 27
Let’s Keep Exploring the Crab Nebula
25 ii 2011
Thank You