glast dermer ids 2005 - fermi gamma-ray space telescope · 2011. 11. 1. · ids report glast swg...
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IDS ReportIDS ReportGLAST SWG meetingGLAST SWG meeting
Sept. 2, 2005Sept. 2, 2005
Chuck Dermer (NRL)
GLAST grant supports costs of research with1. Dr. Armen Atoyan (frequent visitor to NRL; travel to GLAST Symposium)
UHECRs and ν from GRBs and blazars, Chandra jets, Sgr A*2. Dr.Truong Le (NRL/NRC postdoctoral associate)
Particle acceleration theory3. Prof. Govind Menon (Summer Sabbatical Faculty and future vists)
Black-hole research4. Prof. Markus Böttcher (grad student support to Ohio U, visit to NRL)
Microquasars5. Jeremy Holmes (Summer hire) Cosmic ray propagation in the Galaxy
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1. GLAST Science Working Groups:GRBs (ISSS Course, L’Aquila, Italy)Solar SystemBlazars
2. New hire
3. Book: “High Energy Radiation from Black Holes: γ-rays, cosmic rays, and neutrinos”
4. HESS results"THE MULTI-MESSENGER APPROACH TO HIGH ENERGY GAMMA-
RAY SOURCES" July 4-7, 2006 - Barcelona, Spain
Plans for Coming YearPlans for Coming Year
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Statistics of Gamma-Ray Blazars
• Peak of activity of cosmologicalγ-ray sources (blazars, gamma-raybursts) at redshift z ~ 1
• Population evolution is stronglynon-Euclidean, so large number ofsources near threshold for BL Lacobjects and clusters of galaxies
•
(C.D. and Stan Davis, 2001)
GLAST studies of EBL; GLAST studies of EBL; internal absorptioninternal absorption
HBLsHBLs, , LBLsLBLs, and the EBL, and the EBL
HESS HESS obsobs. of high-z . of high-z HBLsHBLs
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Energy from Black Holes
Rotating Black Holes Reducible vs. Irreducible mass
Penrose process
Blandford-Znajek process
Force-free magnetosphere
Maxwell’s equation in 3+1 formalism
(Komissarov 2004)
Energy Extraction from Rotating Black HolesEnergy Extraction from Rotating Black Holes
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Constraint equation in 3+1 formalism
Energy Extraction from Rotating Black HolesEnergy Extraction from Rotating Black Holes
Generalizes monopolesolution of BZ77 to a→M
for a for a «« M M
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Microquasars known for ~11 years
HESS detection of LS 5039
MicroquasarsMicroquasars as Gamma Ray Sources as Gamma Ray Sources
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Bread and butter physics
Gamma Rays from Jet SourcesGamma Rays from Jet Sources
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Claimed orbital variations of TeV radiation
Model for High Mass Model for High Mass MicroquasarsMicroquasars
O6.5V, 23 MO6.5V, 23 Moo primary primaryT = 39000 K (3.5 T = 39000 K (3.5 eVeV))S = 2.5S = 2.5××10101212 cm, i = 25 cm, i = 25°°Period = 3.91 daysPeriod = 3.91 days
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Spectral variations with phase
Phase-dependent Phase-dependent γ−γγ−γ Opacity Opacity
Opacity vs. location of
gamma-ray production site
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Predictions for Predictions for TeVTeV Telescopes Telescopes
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Spectral variations with phase both due to scatteringkinematics and γ−γ absorption
MultiwavelengthMultiwavelength Spectrum of Spectrum of MicroquasarsMicroquasars
10-18
10-16
10-14
10-12
10-10
10-8
10-6 10-3 100 103 106 109 1012 1015
νFν
(ergs cm
-2 s-
1 )
E (eV)
φ = π
φ = 0
SSC
Syn
Stellar
SSC
Stellar EC
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Multiwavelength Emission from Multiwavelength Emission from SgrSgr A* A*
Very weak > 100 MeV γ-ray emission
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With Peter Becker (GMU) and Truong Le
Second-order Fermi accelerationSecond-order Fermi acceleration
10-20
10-18
10-16
10-14
10-12
10-10
10-8
10-6
10-4
10-2
100
10-2 10-1 100 101 102 103
tau_0.01
tau_0.03
tau_0.1
tau_0.3
tau_1
tau_3
tau_10
p0
a = 0, θ = 1, q = 5/3
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Galactic Center Black Hole Emission:Sgr A* ADAF + Black-Hole Plerion + Sgr A West, a black-hole remnant
Predict GLAST detection of quasi-stationary Compton and bremsstrahlungfluxes from pc-scale plerion.
Propagation of GeV electrons power Sgr A West
EGRET emission from young pulsar