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

Gamma Ray Observatories in operation

MAGIC,La Palma

Veritas, USA

Since 2003 (one) -2009 (both)

Since 2007

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

Cherenkov Light

CameraInFocal Plane

e+ ,e

-

Shower Image (O(10 ns))

shower

Pixels

One pixel

~ 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

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

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

Progess of gamma ray astronomy

1996

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

CTA Zoo

DC=Davies-Cotton

SC= Schwarzschild-Couder

SC SC

DC

DCParabolic

SC 4m4m

4m

12m

23m

9m

Layout-Paranal (Chile)

Layout-La Palma

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: Ernenwein@cppm.in2p3.fr

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: Ernenwein@cppm.in2p3.fr

HESS

DataData from first phases of CTA : ~2018Data analysis,Data analysis,ModellingModelling

-rays ??