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GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Gamma ray Large Area Space Telescope (GLAST) ~ 200 people Eduardo do Couto e Silva SLAC Graduate Student Orientation – Sep 22, 2005 E. do Couto e Silva 1 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 GLAST Observatory : Timeline and Overview GLAST will measure the direction, energy and arrival time of celestial g rays Will follow on the measurements by its predecessor (EGRET) with unprecedented capabilities Large Area Telescope will record gamma-rays in the energy range ~ 20 MeV to >300 GeV LAT Construction ends Early 2006 Thermal Vacuum Tests First half of 2006 GLAST will open an energy window never explored before Spacecraft Integration 2006-2007 Launch Date Aug 2007 GLAST Burst Monitor will provide correlative observations of transient events in the energy range ~10 keV – 25 MeV GLAST Lifetime 5 years (min) YOUR PhD 200X E. do Couto e Silva 2 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Why g rays ? • Universe is transparent to g rays g centers of galaxies emit gamma rays • g not affected by magnetic fields • g probes early Universe satellite most violent non-thermal processes found in Nature ~ 500 km E. do Couto e Silva 3 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Science with GLAST • 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 GLAST LAT strengths: All-sky monitoring Broad range of time scales Energy range • 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 E. do Couto e Silva 4 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 LAT will Redefine the g Ray Sky 10 yrs of data recorded before GLAST ! GLAST 1 year E. do Couto e Silva Source class Seen by EGRET Predicted with GLAST Unidentified sources 170 ? Rotation powered pulsars 3-6 100-500 Blazars 50-80 >2000 Normal galaxies 2 4-5 Gamma ray bursts 5 >500 Supernova Remnants/plerions 1-5 >10 Radio galaxies 1-1 ? X ray binaries/microquasars 1-1 ? Starburst galaxies 0 ? Cluster of galaxies 0 ? 5 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Relativistic Outflows: AGN jets Adapted from P. Coppi • Most g ray Jets from active galaxies are – Variable: relativistic jets – and point towards us ! • Radiation is produced by one or more of the following processes – Synchrotron Self Compton – External Compton – Proton Induced Cascades – Proton Synchrotron • Key issues to be addressed – Energetics of the source – jet formation – jet collimation – nature of the plasma – particle acceleration (Buckley, Science, 1998) E. do Couto e Silva 6 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Particle Acceleration: Origin of Cosmic Rays • Supernova Remnants – sites of galactic cosmic ray acceleration • Question – Do g rays originate from hadronic or leptonic processes? • Measurements in the range of 100 MeV to 100 GeV - essential ingredient to resolve the origin (p vs e+/-) Adapted from Aharonian’s talk at the Texas Symposium 2004 Uchiyama (2003) Supernova remnant RX J1713.7-3946 TeV g rays (color) keV X- rays (contours) GLAST p0 model GLAST E. do Couto e Silva 7 e+/model GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Origin of Dark Matter z = 50 z = 20 z = 10 z=5 z=1 z=0 Dark matter halo Milky Way Neutralino annihilations could create high energy g rays …. If true, there may well be photons in the energy range probed by GLAST q g q g ~ ~ ~ ~ 10 a11B a12W 3 a13H10 a14 H 20 E. do Couto e Silva B. Moore, www.nbody.net Clumpy haloes increase the signal of high energy g rays ! Neutralinos may not be the answer! The origin of Dark Matter may come from Extra Dimensions… 8 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Graduate Student on GLAST today… Data Analysis (is it an instrumental effect or a software bug?) Interpretation (understand how instrument works to get a better handle on the science) typical graduate student… E. do Couto e Silva It’s fun to understand how a complex system works 9 Final Explanation GLAST LAT Project Implement in simulations what YOU have learned (Data Challenges) E. do Couto e Silva Graduate Student Orientation, Sep 22 , 2005 It only gets better… 2 yrs from now YOU will be the first to study one of the most exciting data sets Sharpen your knowledge of Science BEFORE Launch (2007) 10 GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Do you want to do Science with GLAST? FACULTY Blandford, Roger Bloom, Elliott [email protected] Drell, Persis S. [email protected] [email protected] Kamae, Tsuneyoshi (Tune) Michelson, Peter Romani, Roger [email protected] [email protected] [email protected] Cameron, Robert do Couto e Silva, Eduardo Digel, Seth Dubois, Richard Madejski, Grzegorz [email protected] [email protected] [email protected] [email protected] [email protected] STAFF POST- DOC GRADUATE STUDENTS YOU Tajima, Hiroyasu Wai, Lawrence L. [email protected] [email protected] E. do Couto e Silva Cohen-Tanugi, Johann [email protected] Wang, Ping Healey, Stephen E. [email protected] [email protected] 11 YOUR NAME [email protected] GLAST LAT Project Graduate Student Orientation, Sep 22 , 2005 Come talk to the GLAST Faculty ! • LAT Construction ends Early 2006 Thermal Vacuum Tests First half of 2006 Spacecraft Integration 2006-2007 Launch Date Aug 2007 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 Lifetime Blandford, Roger [email protected] Found everywhere… 5 years (min) YOUR PhD 200X Bloom, Elliott Drell, Persis S. Kamae, Tsuneyoshi (Tune) [email protected] [email protected] [email protected] Michelson, Peter Romani, Roger [email protected] [email protected] Most of the time @ Stanford Campus Most of the time @ SLAC E. do Couto e Silva 12