GLAST LAT ProjectGraduate Student Orientation, Sep 21, 2006 E. do Couto e Silva 1 Gamma ray Large...
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Transcript of GLAST LAT ProjectGraduate Student Orientation, Sep 21, 2006 E. do Couto e Silva 1 Gamma ray Large...
GLAST LAT Project Graduate Student Orientation, Sep 21 , 2006
E. do Couto e Silva 1
Gamma ray Large Area Space Telescope
(GLAST)Eduardo do Couto e Silva
SLAC Graduate Student Orientation – Sep 21, 2006
~ 200 people
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
Why gamma rays?Why gamma rays?
satellite
~ 500 km
centers of galaxiesemit gamma rays
• Universe is transparent to rays • not affected by magnetic fields• probes early Universe
most violent non-thermal processes found in Nature
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
GLAST Observatory : Overview GLAST Observatory : Overview GLAST will measure the direction, energy and arrival time of celestial GLAST will measure the direction, energy and arrival time of celestial rays rays
Will follow on the measurements by its predecessor (EGRET) with unprecedented capabilities
LAT Principal Investigator: Peter MichelsonGBM Principal Investigator: Charles Meegan
Large Area Telescope will record gamma-rays
in the energy range ~ 20 MeV to >300 GeV
GLAST Burst Monitor will provide correlative
observations of transient events in the
energy range ~10 keV – 25 MeV
Spacecraft Integration
Sep 2006 - Sep 2007
Launch DateEnd of 2007
GLAST Lifetime
5 years (min)
YOUR PhD
200X
GLAST will open
an energy window never explored before
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
EGRET Source CatalogEGRET Source CatalogGLAST Survey: ~10,000 sources (2 years)GLAST Survey: ~10,000 sources (2 years)
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
The sky seen by GLAST…The sky seen by GLAST…
GLAST LAT Simulations GLAST LAT Simulations
great for rotation student projects! great for rotation student projects!
and we have Terabytes of LAT data from pre-launch tests and we have Terabytes of LAT data from pre-launch tests including test beamincluding test beam
of several particles types and energies of several particles types and energies
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
AGN (Blazars): Emission MechanismsAGN (Blazars): Emission Mechanisms
Most of the EGRET AGNs were Most of the EGRET AGNs were blazarsblazars• Variability: relativistic jetsVariability: relativistic jets• Jets point towards us !Jets point towards us !
Key issues to be addressedKey issues to be addressed• Energetics of the sourceEnergetics of the source• jet formationjet formation• jet collimationjet collimation• nature of the plasma nature of the plasma • particle accelerationparticle acceleration• radiation processesradiation processes
(Buckley, Science, 1998)
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
Key Issues in Gamma Ray BurstsKey Issues in Gamma Ray Bursts
GRB OriginGRB Origin• Triggering mechanismTriggering mechanism
• Energy sourceEnergy source
• Jet productionJet production
GRB EvolutionGRB Evolution• Particle content of GRB Particle content of GRB
outflowoutflow
• Efficiency in energy Efficiency in energy transport and conversiontransport and conversion
• Role of B fieldsRole of B fields
• Nature of high energy Nature of high energy emissionsemissions
GLAST will…. place strong constraints on physical conditions within the source region
(may include bursts from the first generation of stars)
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
SNR: Sites of Hadronic Acceleration?SNR: Sites of Hadronic Acceleration? Supernova Remnants: Supernova Remnants:
• by-products of Supernova explosionsby-products of Supernova explosions
• expected sites of galactic cosmic ray acceleration expected sites of galactic cosmic ray acceleration
• non-thermal emission (X-rays and non-thermal emission (X-rays and -rays)-rays) Measurements in the range of 100MeV-100GeV Measurements in the range of 100MeV-100GeV
• essential ingredient to resolve the origin (essential ingredient to resolve the origin (pp vs vs ee+/-)+/-)
Adapted from Aharonian’s talk at the Texas Symposium 2004
Question:Question:Do Do rays originate rays originate from hadronic or from hadronic or
leptonic processes?leptonic processes?
LAT Energy Range
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
Clumpy haloes increase the signal of high energy rays !
Origin of Dark Matter: a particle candidate?Origin of Dark Matter: a particle candidate?Dark matter halo z = 20z = 50
z = 5z = 10
z = 0z = 1
B. Moore, www.nbody.net
If true, there may well bephotons in the energy range probed
by GLAST
0214
0113
31211
01
~~~~HaHaWaBa
q
q
Neutralino annihilations could create high energy rays ….
Neutralinos may not be the answer! The origin of Dark Matter may come from
Extra Dimensions…
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
Graduate Student on GLAST today…Graduate Student on GLAST today…
typical graduate student…
Data Analysis(is it an instrumental effect
or a software bug?)
Interpretation(understand how instrument works
to get a better handle on the science) Final Explanation
It’s fun to understand how a complex system
works
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
It only gets better…It only gets better…
Sharpen your knowledge of Science
BEFORE Launch (2007)
2 yrs from now YOU will be the first
to study one of the most exciting data sets
Implement in simulations what YOU have learned
(Data Challenges)
Graduate Student Orientation Sep 21, 2006
E. do Couto e Silva SLAC/KIPAC
GLAST LAT CollaborationGLAST LAT Collaboration FranceFrance
• IN2P3, CEA/SaclayIN2P3, CEA/Saclay
ItalyItaly• INFN, ASIINFN, ASI
JapanJapan• Hiroshima UniversityHiroshima University• ISAS, RIKENISAS, RIKEN
United StatesUnited States• California State University at SonomaCalifornia State University at Sonoma• University of California at Santa Cruz - Santa Cruz Institute of Particle Physics University of California at Santa Cruz - Santa Cruz Institute of Particle Physics • Goddard Space Flight Center – Laboratory for High Energy AstrophysicsGoddard Space Flight Center – Laboratory for High Energy Astrophysics• Naval Research LaboratoryNaval Research Laboratory• Ohio State UniversityOhio State University• Stanford University (SLAC and HEPL/Physics)Stanford University (SLAC and HEPL/Physics)• University of WashingtonUniversity of Washington• Washington University, St. LouisWashington University, St. Louis
SwedenSweden• Royal Institute of Technology (KTH)Royal Institute of Technology (KTH)• Stockholm UniversityStockholm University
Cooperation between NASA and DOE, with key international contributions from
France, Italy, Japan and Sweden.
Managed at Stanford Linear Accelerator Center (SLAC).
Principal Investigator: Principal Investigator: Peter MichelsonPeter Michelson (Stanford & SLAC)
~225 Members (includes ~80 Affiliated Scientists, 23 Postdocs,
and 32 Graduate Students)
GLAST LAT Project Graduate Student Orientation, Sep 21 , 2006
E. do Couto e Silva 13
Do you want to do Science with GLAST?Do you want to do Science with GLAST?
SLACRESEARCH
STAFF
Cameron, Robert
do Couto e Silva, Eduardo
Digel, Seth
Madejski, Grzegorz
Tajima, Hiroyasu
Wai, Lawrence L.Wai, Lawrence L.
[email protected]@slac.stanford.edu
Dubois, Richard
Bloom, Elliott
Blandford, Roger
Kamae, Tsuneyoshi (Tune)
Drell, Persis S.
Romani, Roger
Michelson, Peter
FACULTY
GLAST LAT Project Graduate Student Orientation, Sep 21 , 2006
E. do Couto e Silva 14
Do you want to do Science with GLAST?Do you want to do Science with GLAST?
Cohen-Tanugi, Johann
SLAC POST- DOCS
Wang, Ping
YOU
YOUR NAME
SLAC GRADUATE STUDENTS
Edmonds, Yvonne Vasetta
Paneque, David
Funk, Stefan
Carson, Jennifer
Bouvier, Aurelien
Healey, Stephen E.
Lee, Shiu Hang (Herman)
GLAST LAT Project Graduate Student Orientation, Sep 21 , 2006
E. do Couto e Silva 15
Come talk to the GLAST Faculty !Come talk to the GLAST Faculty !
Bloom, Elliott
Kamae, Tsuneyoshi (Tune)
Drell, Persis S.
Most of the time @ SLAC
Romani, Roger
Michelson, Peter
Most of the time @ Stanford Campus
Blandford, Roger
Found everywhere…
Spacecraft Integration
Sep 2006- Sep 2007
Launch DateEnd of 2007
GLAST Lifetime
5 years (min)
YOUR PhD
200X
• High Energy Sky Survey : – Unidentified EGRET sources and GLAST Source Catalog
– unresolved point sources– Population Studies
– To avoid peculiarities of individual sources (AGN, Pulsars, SNR…)– Diffuse Gamma ray emission
– Galactic and Extragalactic– Unresolved point sources
– Physics of particle acceleration – Jets in Active Galactic Nuclei (AGN)– energy conversion – shocks in Supernova remnants (SNR)– role of hadrons in radiation processes
• High-energy behaviour of transients :– Gamma Ray Bursts– Solar Flares
• Discovery Potential:– New classes of astrophysical objects– Origin of Extragalactic Background– Searches for Dark Matter and Extra Dimensions– Tests of Lorentz Invariance
GLAST LAT Project Graduate Student Orientation, Sep 21 , 2006
E. do Couto e Silva 16
See you soon…See you soon…
• This Friday – you will meet more GLAST colleagues from Campus and
campus research staff– stay tuned !
• Next Wednesday (Sep 27 , 4 pm )– Special GLAST Session with more details !
» we will remind you by email !
– Location: 3rd floor Varian conference room
• Deadline to decide about joining GLAST @ SLAC : Oct 2, 2006 !– we will tell you who to contact when you come to the next
session