Gamma-ray Large Area Space Telescope. Arecibo Synergy with GLAST (and other gamma-ray telescopes) Frontiers of Astronomy with the World’s Largest Radio Telescope 12 September 2007 Dave Thompson GLAST Large Area Telescope Multiwavelength Coordinator David.J.Thompson@nasa.gov
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Arecibo Synergy with GLAST (and other gamma-ray telescopes)
Frontiers of Astronomy with the World’s Largest Radio Telescope
12 September 2007
GLAST Large Area Telescope Multiwavelength Coordinator
for the GLAST Mission Team
see http://glast.gsfc.nasa.gov and links therein
TeVKnown Gamma-ray Sources Are Multiwavelength
Gamma-ray sources are nonthermal, typically produced by interactions of high-energy particles.
Known classes of gamma-ray sources are multiwavelength objects, seen across much of the spectrum.
INTEGRAL GLAST GBM Swift
Gamma-ray Facilities: More Numerous, More Capable
Two GLAST instruments:
Large Area Telescope
LAT: 20 MeV – >300 GeV (LAT was originally called GLAST by itself)
LAT field of view ~2.5 sr
GLAST Burst Monitor
GBM: 10 keV – 25 MeV
GBM field of view ~9 sr
Launch: This Winter
Lifetime: 5 years minimum, 10 years goal
So far, gamma-ray telescopes have only seen the brightest objects – the “tip of the iceberg.” The fainter sources are where Arecibo will be critical.
Diffuse Emission for cooperation with the Arecibo telescope?
How do the GALFACTS and GALPROP/gamma-ray studies compare in interpreting the Galactic magnetic field/particle distributions?
What do these results imply about particle confinement and propagation?
Can we use this information to search for local sources of cosmic rays?
Blazars for cooperation with the Arecibo telescope?
What do the combined radio/gamma-ray observations tell us about particle acceleration and interaction – processes, location?
What can this information reveal about jet formation and collimation?
Radio Galaxies for cooperation with the Arecibo telescope?
Left: TeV and radio images of M87, one of a handful of radio galaxies seen in gamma rays.
Right: TeV variability of M87.
Is the gamma-ray variability related to changes in the jet? In the core?
What about fainter radio galaxies?
Microquasars – Binary Systems for cooperation with the Arecibo telescope?
LSI 5039 – compact object in orbit around an O star.
Gamma-ray emission varies during the 4 day orbit.
VLBI suggests that the emission comes from a jet.
LSI +61 303 – compact object in orbit around a Be star.
Gamma-ray emission varies during the 26 day orbit.
VLBI suggests that the emission comes from a pulsar wind.
What sort of compact object?
How are the particles accelerated?
Are there different types of such high-mass binary systems?
The Unknown for cooperation with the Arecibo telescope?
Over half the sources in the third EGRET catalog remain unidentified.
GLAST will detect many more sources.
Identifying and understanding such sources will be a multiwavelength challenge.
What other types of objects produce high-energy gamma rays and radio?
Are there radio-quiet gamma-ray sources (e.g. beamed)?
Summary for cooperation with the Arecibo telescope?
The nonthermal nature of high-energy gamma-ray emission almost assures that gamma-ray sources will be radio sources.
The new generation of gamma-ray telescopes is already expanding the number and types of sources, and this process will accelerate with GLAST.
Radio, especially the great sensitivity of Arecibo, will be a critical partner with gamma-ray astrophysics.