Transcript ppt

Gamma-ray Large Area Space Telescope
– exploring the high-energy universe
ESAC_3_24_05.ppt
Gamma-ray Large Area Space Telescope
► flight
hardware now arriving at
SLAC for instrument integration

4 flight towers installed
► Schedule:

instrument assembly complete:
December 2005

instrument environmental tests
complete: May 2006

LAT delivery to Spectrum-Astro
(General Dynamics) for integration
with spacecraft: May 2006
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LAT Schedule
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Critical path to ship LAT to Spectrum Astro
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Flight Hardware Integration
Preparation of flight grid for TCS integration
LAT Integration stand with PAP ready for
proof test
Flight Tracker in Cleanroom at SLAC
Flight Calorimeter
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First Flight Tower in I&T
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First Integrated Tower – Muon Candidate Event
Tracker
planes
XZ
projection
YZ
projection
Calorimeter
crystals
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Gamma-ray Candidate Event
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Two Towers in Grid
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First 2-tower events
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First 2-tower events
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Interest in GLAST Mission is growing
►
At all mission levels, including Conferences, Workshops.
►
Multiwavelength survey initiatives underway
─ VLA monitoring for a large sample of flat-spectrum, compact sources
─ VLBA Imaging and Polarimetry Survey proposed to obtain a set of reference images
for 1000 potential LAT sources in advance of GLAST launch
─ Northern and Southern hemisphere radio pulsar timing campaigns in support of
GLAST mission
─ optical and radio monitoring of LAT AGN
►
Broad and growing interest
Publications & Conference Proceedings
pre-launch
total
COS-B
1975-1982
11
481
EGRET
1991-2000
53
1212
GLAST
2007-
342
???
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Science Groups of LAT Collaboration

groups responsible for analysis and writing papers
Group
Principal Responsibilities
1. Catalogs
Prepare comprehensive LAT catalog for publication, after 1, 2, and 5 years (nominal),
including cross-identifications when known.
2. Diffuse (Galactic & Extragalactic) and Molecular
Clouds
Generate Galactic diffuse model for delivery to community (GSSC) and provide periodic
updates; study mass tracers and CR density in individual clouds;
Analysis of the residual isotropic gamma-ray emission (after accounting for LAT sources
and Galactic diffuse) including its spectra and angular fluctuations; assess contributions
from various source classes
3. Blazars & Other AGNs
Analysis of spectra and time variability of LAT-detected blazars and other types of AGNs;
modeling of spectra (e.g. SSC model) including effects of EBL; study evolution with
redshift
4. Pulsars, SNRs & Plerions
Construct phase-resolved “light curves” and spectra for LAT-detected radio pulsars;
search for periodic emission in other sources, including unidentified sources; identify SNRs
and plerions and model spectra of these sources
5. Unidentified Sources, Population Studies, & Other
Galaxies
Coordinate deep multi-wavelength studies of the error boxes of the unidentified GLAST
sources and correlate with potential counterpart populations; determine the heterogeneity
of the population and correlate with source characteristics \(e.g. time variability; spectral
index, etc.)
Search for emission from other galaxies, particularly nearby galaxies such as M31, ULRGs,
and from clusters of galaxies; determine source spectra and/or set upper limits
6. Dark Matter and Exotic Physics
Search for signatures of dark matter, extra dimensions (e.g. KK graviton decay), quantum
gravity dispersion effects, etc.
7. Gamma-Ray Bursts
Construct LAT GRB catalogs; determine burst spectra, including time evolution;
coordinate joint analysis of bursts with GBM
8. Sources in the Solar System
Solar flares; lunar emission; …
9. Calibration and Analysis Methods
Pre-flight performance of the LAT and on-orbit calibration and performance
(1) Monte Carlo model of LAT; event reconstruction and background rejection methods;
(2) astrophysical data analysis methods (e.g. likelihood analysis; time series analysis; source
spectral analysis, cross-correlation methods, etc.)
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Science Group Coordinators
Group
Coordinators
1. Catalogs
Seth Digel (SU-SLAC);
Isabelle Grenier (CEA/Saclay)
2. Diffuse (Galactic & Extragalactic) and Molecular
Clouds
Seth Digel (SU-SLAC);
Isabelle Grenier (CEA/Saclay)
3. Blazars & Other AGNs
Paolo Giommi (ASDC);
Benoit Lott (IN2P3–Bordeaux)
4. Pulsars, SNRs & Plerions
Roger Romani (Stanford);
5. Unidentified Sources, Population Studies, & Other
Galaxies
Patrizia Caraveo (IFC, CNR);
6. Dark Matter and Exotic Physics
Elliott Bloom (SU-SLAC);
Aldo Morselli (INFN–Rome)
7. Gamma-Ray Bursts
Jay Norris (GSFC);
Nicola Omodei (INFN-Pisa);
David Thompson (GSFC)
Olaf Reimer (Stanford)
N. Kawai (start 07; sabbatical at SU 08-09)
8. Sources in the Solar System
Gerry Share (NRL)
9. Calibration and Analysis Methods
William Atwood (UCSC);
Steve Ritz (GSFC)
Eduardo do Couto e Silva (SU-SLAC, start ~07)
►
P. F. Michelson
science coordinator telecons: ~ every two weeks
GLAST LAT SSAC Meeting: March 15, 2005
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