presentazione di powerpointintegral.esac.esa.int/5th_anniversary/24_caraveo.pdf · presentazione di...
TRANSCRIPT
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Gamma-ray Astronomy
Looking for diversity in the gamma-ray sky
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The state of the art in γ-ray astronomy•271 sources 172 UGO
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339 sources 206 without ID
UGOs’ presence: is it anomalous ?
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The presence of unidentified sources is normal, when a field is (still) in its infancy
Genuinely new class of objects
Known(catalogued) objects, floatingin big error boxesKnown objects with a
new phenomenology
Improving angular resolution if always beneficial
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AGN32%
CV5%HMXB
18%
LMXB21%
Pulsars3%
Unknown19%
SNR2%
Integral source distribution
35 %2 %
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IBIS EGRET VHE
TOTAL 421 271 71
Extra 32% 35% 27% coverage
Pulsars 3% 2% --Snr/Pwn 2% ?? 25%Binaries 39% ?? 7%Others 5% ?? 3%
UNID. 19% 63% 38%
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The anomaly with γ-rays is the time needed (so far) to identify sources
and the very limited choice of source type
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Big error boxes require additional inputs
If not, multiwavelength strategy
variability is the only viable tool
Long, complex, success is not guaranteed
ID rate: 1 per decade
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Glast will detect hundreds of sources whichwill be positioned at a 5-10 arcmin level
Ars longa, vita brevis
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Unidentified γ-ray sources
Diversity?
Craig Kanarick
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Unidentified γ-ray sources
Similarity ?
With some degree offreedom
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To decide what kind of candy gamma-rayphotons like best