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TRANSCRIPT
Detection of the Crab Nebula using an
innovative gamma-ray telescope
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomy
Justin [email protected]
(University of Wisconsin)on behalf of the CTA Consortium
American Astronomical SocietySummer (236th) Meeting
“Cosmic Bangs & Whimpers” press panelJune 1, 2020
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground based gamma ray astronomy
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Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground based gamma ray astronomy
Credit: CTA
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Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomyPrototype Schwarzschild-Couder Telescope (pSCT)
• Building on generations of improvements in imaging atmospheric Cherenkov telescopes, starting from first TeV detection of Crab Nebula in 1989 by Whipple telescope
• Using two mirrors instead of one• Using modern photon sensors and
electronics• These enable improved angular
resolution and sensitivity• Improvements will provide new TeV
gamma-ray measurements and discoveries up to two times faster than current telescope technology
• Constructed by members of CTA from US, Germany, Italy, Japan, and Mexico
5Justin Vandenbroucke TeV gamma rays from the Crab Nebula
pSCT inauguration at Fred Lawrence Whipple Observatory, January 17, 2019
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomyAlignment of Optical System
Repositioning of all mirror panels from defocused to focused in a few minutes
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 6
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomy
Images of 18 gamma-ray air showers
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 7
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground based gamma ray astronomy
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Visual Identity GuidelinesVersion 2.0
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the observatory for ground based gamma ray astronomy
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Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomy
Additional slides
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 10
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomy
Geometry of an air shower image
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 11
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground based gamma ray astronomy
Galactic Centre
PeVatrons
GalacticPlane Survey
Star Forming Systems
LMC Survey
Transients
AGN
GalaxyClustersExGal
Survey
PeVatrons
Galac
tic
Extrag
alacticDark Matter
Programme
!ey Science Projects (KSPs)
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Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomyThe pSCT is near VERITAS Telescope 4:
2 telescopes can detect the same showers, with similar viewing angle
pSCT
VERITAS T435m
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 13
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomyOptimizing pSCT event selection using VERITAS-tagged
gamma/hadron dataset
Gammas
Retained hadrons
Rejectedhadrons
After developing pSCT cuts on 2.2-hour VERITAS-tagged dataset:Apply them to a disjoint pSCT-only dataset (19.1 hr ON)
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 14
• Punch et al. 1991• Lewis et al. 1993
Cuts retain 94% of gammas (17/18), reject 95% of hadrons
Visual Identity GuidelinesVersion 2.0
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the observatory for ground based gamma ray astronomy
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Visual Identity GuidelinesVersion 2.0
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Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomySimulated shower images for two-mirror
compared to one-mirror telescope design
1 TeV gamma 3.5 TeV proton
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 18
Single-mirrortelescope images8° field of view
0.18°pixels1,570 channels
Two-Mirrortelescope images8°field of view0.067°pixels
11,328 channels
Visual Identity GuidelinesVersion 2.0
cherenkov telescope array
the observatory for ground-based gamma-ray astronomy
!""#"$%&'$&%(#Schwarzschild-Couder Telescope concept:
high-resolution optics and camera enabling exquisite imaging
• Dual mirrors allow (1) excellent optical angular resolution over wide (8°diameter) field of view (2) small camera
• Small focal plane for dense, highly integrated photo-sensors (silicon photomultipliers) and electronics (application-specific integrated circuits)
• Improved gamma-ray angular resolution and background rejection allow improved sensitivity and scientific capabilities
Justin Vandenbroucke TeV gamma rays from the Crab Nebula 19
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