M2 P3TMA September 2016 Astronomie Gamma au CPPM HESS ... · CTA/HESS @ CPPM NectarCam 4m - 2...
Transcript of M2 P3TMA September 2016 Astronomie Gamma au CPPM HESS ... · CTA/HESS @ CPPM NectarCam 4m - 2...
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Astronomie Gamma au CPPMHESS &
Cherenkov Telescope Array
JP Ernenwein, responsable scientifique du groupe HESS/CTA CPPM
HESS (currently in operation)
CTA (project)
M2 P3TMA September 2016
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Gamma Ray Observatories in operation
MAGIC,La Palma
Veritas, USA
Since 2003 (one) -2009 (both)
Since 2007
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HESS, Namibia
MIRRORS (28 m)CAMERA(2m, 2048Photomultipliers)
In operation
1 large + 4 middle-size
12m
960 PMTs
Since 2003 (4)-2012 (+1)
@CPPM:Physics studies:Galactic sources :Binaries,Supernova Remnants
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Cherenkov Light
CameraInFocal Plane
e+ ,e
-
Shower Image (O(10 ns))
shower
Pixels
One pixel
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~ 10 km
Showere+,e -
~ 1o
Che
renk
ov L
ight
~ 120 m
E=100 GeV : ~1 Cherenkov photon/m2
=> need of large mirror area
Field of View 4° to 9°
Several telescopes :stereoscopy
~0.06°of angular resolution
Onetelescope
shower
image
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Cosmic particles @ EarthProtons 89% helium 10 %heavier 1%
99% nuclei 1% electrons(drops beyond 1 TeV)
and 0.1%
Besides, the flux decreases with Energyfollowing ~ power law :
E-
our field
~ 2-3
Here spectral index = -2.3
RXJ1713
Satellites (FERMI) Telescopes @ ground : HESS ...
+
Instruments for detection
RXJ17-13
HESSMoon
SuperNovaRemnant (SNR)
RXJ1713
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Sources of gamma raysCharged particles are accelerated in astrophysical sources (electrons, protons) , then gamma rays are produced following several scenarios : inverse compton,
neutral pion decay, bremsstrahlung .
“Blazar” M87
Example :Active Galactic Nuclei,with jets
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Progess of gamma ray astronomy
1996
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CTACherenkov Telescope Array
from ~2023 (completion)
4x23m + 25x12m+70x4m
4x23m + 15x12m
Chile/Paranal
Spain/La Palma
Sensitivity x10~20 GeV to ~300 TeV
~1000 Sources expected
Construction starting in 2017, early science starting in 2018
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CTA Zoo
DC=Davies-Cotton
SC= Schwarzschild-Couder
SC SC
DC
DCParabolic
SC 4m4m
4m
12m
23m
9m
Layout-Paranal (Chile)
Layout-La Palma
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12m
data acquisition system for the camera
Study of performance of arrays of telescopes (simulationssimulations).
Participation to the analysis of dataanalysis of data from the 1rst prototype (Meudon).
Physics studies @ very high energy : sensitivity to cut-off in energy spectra of SNRs (simulationssimulations).
CTA/HESS @ CPPM NectarCam
4m
- 2 engineers (data acquisition)- 4 physicists (3 staff + 1 post-doc)
CTA
CTA
Galactic Binaries : search for VHE gamma-ray emission from Microquasars (HESS framework, + FERMI -rays, + X-rays, + radio)
M2 internship(s) and Thesis project proposed : data analysis for physics in HESS (binaries). Extrapolation to CTA (predictions from simulations). Participation to CTA data analysis in first phases.Contact: [email protected]
M2 internship(s) and Thesis project proposed : data analysis for physics in HESS (binaries). Extrapolation to CTA (predictions from simulations). Participation to CTA data analysis in first phases.Contact: [email protected]
HESS
DataData from first phases of CTA : ~2018Data analysis,Data analysis,ModellingModelling
-rays ??