NASM 1 Exploring the Crab Nebula with the Hubble Chandra and Fermi Space Telescopes Roger Blandford KIPAC Stanford Anasazi Indians 25 ii 2011 NASM 2 Charles Messier 25 ii 2011 NASM 3 ID: 216422
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Slide1
25 ii 2011
NASM
1
Exploring the Crab Nebula with theHubble, Chandra and FermiSpace Telescopes
Roger BlandfordKIPACStanfordSlide2
Anasazi Indians
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NASM
2Slide3
Charles Messier
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NASM
3Slide4
Sam Okoye
discovers compact radio source
25 ii 2011
NASM4Slide5
Franco Pacini
predictsCrab Nebula Powered by Neutron Star
25 ii 2011
NASM5Slide6
Jocelyn Bell Discovers Pulsars
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NASM
6Slide7
John Bahcall (1934-2005)
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NASM
Astrophysicist
Astronomical LeaderMentor to Young ScientistsChampion of Hubble Space Telescope7Slide8
Hubble Space Telescope
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NASM
8Slide9
Chandra X-ray Telescope
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9Slide10
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10
High Energy Astronomy!
VERITAS/H.E.S.S.LIGOIce 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
RadioSlide11
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Fermi(the scientist and the telescope)Slide12
The Pulsing
g
-ray Sky
Pulses at
1/10
th
true rate
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NASMSlide13
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NASM
H.E.S.S.
13Slide14
Supernova Explosion
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14
Supernova 1987a in Magellanic CloudSlide15
Crab Nebula at Different Wavelengths
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15Slide16
Optical and X-rays Combined
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16Slide17
The Entire Spectrum
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17Radio
Gamma RaysTeVSynchrotronRadiationComptonScatteringSlide18
Synchrotron Radiation
Maximum Synchrotron Photon Energy ~ 100
MeV
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18NASM~0.01 Gauss10
keV
10
TeVSlide19
Compton Scattering
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0.1 eV Infrared Photon
10 TeV Electron
5
TeV
Electron
5
TeV
Gamma-
rayPhotonSlide20
Neutron Star
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20Wilson
Mass: 1.5 sunsRadius: 10 km Density: million, billion x waterRotation Rate: 30 per secondMagnetic Field: 1 trillion Gauss Slide21
Crab Pulsar
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21Slide22
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22
Faraday’s Disk
MagnetConducting DiskCrank
Voltage: 50
PetaVolts
Current: 300
TeraAmps
Power: 100,000 SunsSlide23
The
Restless Crab
Hester
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NASMSlide24
Fermi
Flares
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24NASMSlide25
Spectral
Changes
September Flare
4 day variation
SynchrotronRadiationCompton Scattering25 ii 2011
25
NASM
SynchrotronRadiationLimitSlide26
Where is the Flare?
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26
JetTorus
PulsarSlide27
Let’s Keep Exploring the Crab Nebula
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27
Thank You