13.00 o7 j adams
DESCRIPTION
Research 5: J AdamsTRANSCRIPT
The High-Energy Universe
View from my office
More violent universe discovered in other wavelength bands...
High Energy Particles
Brem + IC
S + 0 decayICS
Brem
sstrahlung + ICS
Radio Microwave Infrared Visible Ultraviolet X-ray Gamma
Synch
rotro
n
ICS
ICS
Leptons Bremsstrahlung
Inverse Compton
Synchrotron
Pair Production
Hadrons Pion Decay
Nuclear Transitions
Active Galactic Nuclei
Objects that emit significant amounts of radiation from non-thermal sources
(i.e. not stars or dust or thermal gas).AGN Zoo: Seyfert Galaxies Radio Galaxies
FR1FR2
Quasars Blazars
Basic Emission Mechanisms
Radio –synchrotron of electrons in the jet
Infrared – thermal emission from the torus
Optical – thermal emission from the diskX-ray-gamma – Inverse Compton
What causes the jets?
Enormous number of jet modelsCurrent most promising ideas extract
energy from the accretion flow via magnetic fieldsExtract energy and angular momentum
though magnetic field anchored in the diskExtract spin energy of the black hole through
magnetic fields threading its horizon
Why are AGNs interesting?
Some of the most spectacular objects in our universe
Black holes could be test beds for quantum gravity
Source of the high-energy cosmic rays?Important for structure formation?
Observing AGN over 13 orders of magnitude in energy
13
Blazar PKS 2155-304
GeV TeVX-rayoptical
HESS and Fermi, ApJ Letters, 696, L150 (2009)
EGRETFermi
Are AGN the source of UHE Cosmic Rays?
Why detect neutrinos?
Because they’re fast....+-
+
+ -
e+ e
e+ e-
e+
0
e-
e+
IceCube Neutrino Observatory
Other neutrino detectors in proportion
Super Kamiokande
SNO
Needle in a haystack?
Plato 428BC-348BC
Astronomy compels the soul to look upwards and leads us from this world to another
Electron neutrino/cascade search results
Examples
But....