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T. Courvoisier X-ray and gamma ray observations 1March 2007
X-ray and gamma ray observations
From a fraction of a keV(~ 10 Angstroem,few x 1016 Hz)
to TeVs, i.e. >6 ordersof magnitude
Science that started whenrockets reached space
Most discoveriesunexpected
T. Courvoisier X-ray and gamma ray observations 2March 2007
Below a fraction of a keVinterstellar medium is opaque
abs ~e-σNH
similar transmission at1keV and in the IR domain
Few attemps at measurementsin the 100s Angstroem region(FUSE, EUVITA). 1Ry
T. Courvoisier X-ray and gamma ray observations 3March 2007
X-ray Optics:
Grazing incidencefocusing optics
XMM angular resolution: 10”(conical approximation)
Chandra: 1”
Wolter optics:
T. Courvoisier X-ray and gamma ray observations 5March 2007
XMM ReflectionGrating SpectrometerResolution 200-8005-35 Angstroem
T. Courvoisier X-ray and gamma ray observations 6March 2007
XMM ESA corner stonelaunched in December1999
T. Courvoisier X-ray and gamma ray observations 7March 2007
Line and continuumcontributions to thermal emission.
X-ray spectroscopyvery importantdiagnostics
T. Courvoisier X-ray and gamma ray observations 8March 2007
Clusters of galaxies
Optical image dominated by galaxies (thausends), X-ray image by hot gasXMM, Briel et al.Kitt Peak
T. Courvoisier X-ray and gamma ray observations 9March 2007
A2052, X-ray spectrum, Kaastra et al.
Gas has been processed in stellarinteriors
Perseus, Boehringer et al.Mass dominated by dark matter
T. Courvoisier X-ray and gamma ray observations 10March 2007
Above ~10keV: no optics (presently)---> Coded masks
INTEGRAL IBIS mask
T. Courvoisier X-ray and gamma ray observations 11March 2007
Coded masks:
-multiple pin holes cameras
-mask pattern such that its autocorelation is a delta function
- sky image is reconstructed through deconvolution depends strongly on the flatness of -sensitivity -background
-signal proportional to area, spread over the whole detector (no focusing)-background proportional to area, therefore noise to size-therefore signal to noise proportional to size.
T. Courvoisier X-ray and gamma ray observations 12March 2007
MeV region: difficult not only in theoptical aspects, but also in the detection:
E, MeV
SPI: spectromètre à haute résolution (500)19 detecteurs en Germanium refroidis à 90 K“annealing” : 100 C
Pis: J.-P Roques (CESR), V. Schoenfelder (MPE). Vedrenne et al. A+A, 2003, vol 411
T. Courvoisier INTEGRAL 13
Pis: P. Ubertini (IAS), F. Lebrun (CEA). Ubertini et al. A+A, 2003, vol. 411
ISGRI: Imageur2 plans de détection: ISGRI, 16384 CdTe detectors PICSIT, 4096 CsI detectors
T. Courvoisier INTEGRAL 14
Toutes les données transitent à l'ISDC et y sont analysées
Centre opérationsde l'ESA
ISDC
T. Courvoisier INTEGRAL4 16
T. Courvoisier First results of INTEGRAL 17
IGR J16318-4848Découverte le 29 janvier 2003 lors d'une observation de routine. Première d'une série d'objets engoncés dans un cocon de matière
2°
T. Courvoisier First results of INTEGRAL 19
GX5-1, Neutron star binary system A. Paizis et al.
Accretion disk and a Compton component, hard tails arenot a signature of the presence of black holes.
T. Courvoisier First results of INTEGRAL 2020March 2005
V 0332+53 in outburst, December 04.Cyclotron lines at 25, 55 and 75 keV Kreykenbaum et al 05
Jem-XISGRISPIonINTEGRAL
T. Courvoisier First results of INTEGRAL 21
Centre de la Galaxie
tous les 3 jours de février 2005à avril 2006
(février-avril et août-octobre)
Image moyenne
Question: d'où viennent les anti-électrons ?
N. Mowlavi INTEGRAL 22
INTEGRAL J. Knödlseder et al.
Électron + anti-électron --> annihilation e- + e+ −−> 2 photons à 511 keV
Anti – électrons
T. Courvoisier X-ray and gamma ray observations 23March 2007
Polar is an instrument to measure the polarisation of gamma ray bursts to understand their physics
“light” project (25 kg, small ressources...) in a prototype stage. Collaboration GE-PSI.
T. Courvoisier X-ray and gamma ray observations 25March 2007
Electron-positron optics
above some 10 MeV up to 100 GeV (but flux becomes very small)create pairs from the gamma ray (> 2mec2) and measure the tracesand energies of the electron and positron
EGRET on CGRO GLAST, to be launched in 2007
T. Courvoisier X-ray and gamma ray observations 26March 2007
Quasar 3C 273: archetype of quasars, z=0.158, L~1048ergs/s
Turler et al. Chernyakova et al.
T. Courvoisier X-ray and gamma ray observations 27March 2007
Above 30-100 GeV: Cerenkov Telescope arrays use the atmosphere as detector and measure the Cerenkov light of particle showers generated by the interaction of gamma rays (or cosmic rays) with atmosphere.
HESS in Namibia
T. Courvoisier X-ray and gamma ray observations 28March 2007
HESS image of a supernovaremnant (RX J1713.7-3946;Aharonian et al. 2006)
10's of sources now detected,perspecive of having 500 ormore with CTA(improved sensitivity).
CH contributions in EPFZ(hardware) andISDC (“observatory”)Measures sites of
particle acceleration
origin of cosmic rays.
T. Courvoisier X-ray and gamma ray observations 29March 2007
Future Challenges of high energy astrophysics:
-Physics of matter in extreme conditions
Formation of first black holes (quasars) very early in the Universe
T. Courvoisier X-ray and gamma ray observations 30March 2007
Need to increase sensitivity by large factor
Current technologies cannot be scaled up(X-ray optics: mass scales with area, i.e. with signalgamma ray optics: mass scales with (s/n)3)XMM and INTEGRAL are as massive as can be launched (in practical terms)
XEUS concept: light weight X-ray optics
Move from Ni shells optics to optics based onX-ray reflecting Si Wafers optics
gain a factor 10 mirror area per unit of mass.
T. Courvoisier X-ray and gamma ray observations 31March 2007
Take a Si Wafer,etch grooves (~1mmx1mm)bend the plates to match optical req.stack them so that Si sticks to Si
Coating for high energy reflectivity
7cm
Reflective surf.
Hasinger et al. SPIE 2006 and ESA docs
T. Courvoisier X-ray and gamma ray observations 32March 2007
Expect ~5-10” angular resolution
Formation flight toincrease focal length
ESA studies for nextlarge X-ray mission
T. Courvoisier X-ray and gamma ray observations 33March 2007
Progress in the 100keV-10MeV domain requiresfocusing....
P. von Ballmoos et al. Toulouse
Problem: monochromatic device
T. Courvoisier X-ray and gamma ray observations 35March 2007
At very high energies:
observe cosmic rays throughtheir Cerekov light production from above
Flux: rate is ~one per km2 per century at 1020eV
EUSO concept
T. Courvoisier X-ray and gamma ray observations 36March 2007
High energy astrophysics is lively-many results coming in-stems from a combination of adequate funding and competent community
-There are many more questions to be dealt with
-There are technologies to address these questions
but
There is by far not enough funding
Great danger of loosing the community