Click here to load reader

Concluding remarks 2003/12/11,12研究会  T.Kifune(shinshu)

  • View
    62

  • Download
    3

Embed Size (px)

DESCRIPTION

Concluding remarks 2003/12/11,12研究会  T.Kifune(shinshu). 「物理学の 多様性 と 普遍性 の探求」   多くの天体の観測による   TeVガンマ線源から抽出される            多様な現象                  法則性? TeVガンマ線天文学の役割? 現象の発見に徹するか、解釈に重点を置くか. TeV γ. TeV γ. Concluding remarks 2003/12/11,12研究会  T.Kifune(shinshu). CANGAROO望遠鏡による   ガンマ線天文学の 新展開 - PowerPoint PPT Presentation

Text of Concluding remarks 2003/12/11,12研究会  T.Kifune(shinshu)

  • Concluding remarksT.Kifune(shinshu)

  • Concluding remarksT.Kifune(shinshu)

  • /-ray astronomy Implication Imaging Air Cerenkov Telescope-ray astronomy Ultimate IACT

  • A telescope at sunset. Once a telescope is equipped with mirrors, it has to be stowed facing south during daytime, since sunlight focused by the large mirror will generate enormous heat at the focus. Only after sunset the telescopes can be pointed safely towards the sky.ICRCMAGICHESSHeidelberg

  • TeV -ray sources sources (8 egrets;8A+5B+5C) according to TCW

  • so far obtained & some inferred are summarized as :six blazars How peculiar/standard they are? in comparison with GeV blazars three SNRs (+ PSRs) : against 100 104~5yrs/50yrsHow peculiar/standard they are? Eacc up to 1015eV? two galaxies

    How peculiar/standard the Galactic CRs are?Disk emission?Normal galaxies by deeper observation-ray observation extends CR physics to extragalactic space

    other types: unID, x-ray binary?, GC,

  • Nearby molecular clouds, EGRET source and so onO.Reimer & M.Pohl A&A, 390, L43, 2002M.Butt et al., Nature 418, 489, 2002

    Dq=0o.240.8oDiscussions a lot

  • Morphology, stereo Chandra X-ray image

    Galactic disk

    TeV -ray image? accelerationradiation

  • I heard from Trevor, Trmper said

    The total energy of all the X-ray photons so far observed by ROSAT corresponds to one TeV photon. To be energetic is something valuable. erg/Joule is a jewel !

    Laboratory

  • Thoughts coming up, about the value of being energetic?TeV -rays are, as a fact, very energetic events. X-ray photons are numerous: Statistics of TeV -rays is poor.

    1012 eV = 109 X 103 eV similarly,1020 eV = 108 X 1012 eV

    Do we have to collect 108 photons at TeV to keep up with 1020eV cosmic rays?

  • Radio, x-rays --------------------- NS, BH, 2.7K Energetic. enigmatic phenomena that - ray observation looked forare not successful in retrospectNo -rays from matter-antimatter annihilationNo microsec burst -rays from primordial black holesGRB: but not yet in TeV region, and no essencial contribution beyond GeV Cyg X-3 (anomalous interaction?) dissapeared

    Origin of cosmic rays ?Dark matter ?vacuum modification due to quantum gravity ??Top down scenerio of 1020eV cosmic rays ??

  • Statistics: number of photons so far detected in TeV energyNx 109 = 105 104 : X-rays NTeV 104 = 103 10 : TeV s

    N (>E) ~ E-1 ST : E2dN/dE=constant N/Nx = (Ex/E)(104m2/1m2) = 10-9 104 = 10-5

    Roughly explained Number of sources

  • Crab nebula(unpulsed) is the standard source for calibration,but not the standard to represent the other TeV sourcesSSC Model OK!Max. acceleration energy ?~20 TeV or >100 TeVthe sole SNR/plerion : complete multi wavelength Spectrum With definite flux in any band.

  • keV MeV GeV TeV PeV EeV ZeV10010410810121000km10km100mGlast109photons1031 photons106 sources~1 sourcesAreaS (m2)IACTRosatStatistics, number of sourcesScientific Impact??Not to be optimistic!Consideration in a broad band

  • eV 1012eV 1020eVE2dN/dEX-raysourcesTo collect more samples of known sources, to improve accuracy/resolution, and to discover new kinds of objects TeV sourcesOur counter part Eacc, collision with IR photonstemporal conclusion with a claim for jewel of enigma

  • )What we see?

  • 1m2 E / 1keV): 1 msr to 1 sr(100m)2 =104 m2 10GeV 1TeV 100TeV109 107energyEdetection area S (m2)104 IACTlarger dishDetection area , energy and dish sizeGLAST(300m)2 =105 m2(3km)2Wider FOV

  • directions that HE and VHE -ray astronomy will take in future

    Variety of possibilities, corresponding to various kinds of TeV sources and depending on their phenomena in interest.

    It seems natural to go to lower energy region with larger dishes

    Sub 100GeV ~ 1 TeV region 10~100 sources for systematic study of SNRs, blazars ,. discovery of more, new types of ray sources

    However, the current efforts satisfying?---stereo & big dish:

    Let us not give up 10TeV ~ 100TeV region origin of cosmic rays : maximum acceleration energy? blazars : absorption by IR background radiation

  • direction (1) towards sub-100 GeV ?more (weak) sources: N increases with decreasing energy with a constant detection area S = 104m2, providing a good sensitivity. For further drastic improvement, ! (like GLAST) or multiple telescopes > 10 ?comparison with GeV phenomena(Glast)? --- for sharp difference, electrons? (proton spectrum is featureless) anti-counter and MAGIC technique

  • direction (2) towards 10-100 TeV ?SNRs, blazars: to find SNRs with Eacc knee energy 1015eV distant blazars, pair halos, extreme blazars of acceleration energy beyond TeV etc. Unkown sources? not very likelyRegeneration of absorbed gamma rays

    S = const. = 104m2 is small and fatal.

    Interesting possibilities but like a bet.

  • 10GeV 1TeV 100TeV100 m30 menergy10 maperture3 mByproduct of larger A: S = 1km2 to (10km)2 possible for 100 TeV -raysFluorescence lightserenkovlights

  • EuroYenDollarScientificoutcome ?Good telescope is generally very expensive, and would be too unrealistic, , however, Gedanken experiment is free, and ultimate case of complete calorimeter is useful to get a broad vision.e,.g. collection area = detection area (20m)2X 30 = (100m)2 : not ridiculousNot care

  • Ultimate extension of MAGIC concept: complete IACT of A2=SFOVA to S

  • summaryExpected are 3 views for 3 energy regions, which are not separated but quite interrelated.

    Going down to Eth 100 GeV is the first way to take ; with additional efforts for increasing solid angle of FOV

    Dish size A > 20m for 1 TeV (though no justification presented) (Or packed multiple telescope)

    Even larger dish size, will pave the way towards10~100TeV, where a big jewel might be hidden.

  • eV 1012eV 1020eVE2dN/dEX-raysources???Toward ~100TeVMore sources at lower energiesBigger dish !Larger FOV1TeV region with good accuracy

  • CONCLUDING QUESTIONSSNRExtreme BL Lac: ?

    To detect GRBs by TeV-rays?

    TeV-rays and Evolution of Universe? Dark Matter produces TeV-rays? Structure formation and TeV-rays?

    Ultimate IACT to improve sensitivity?

  • Final REMARKsCANGAROO

    deeper commitmentfor

  • Concluding remarksWide variety of phenomena discussed pulsar; blazar; molecular cloud; diffuse gamma rays (disc emission); shock acc. in SNR; Rel.shock in blazar/GRBs gamma rays from structure formation dark matter

    standard shock acceleration for origin of cosmic rays ?? raison detre of TeV gamma ray astronomy? (e.g. vs X-rays or highest energy cosmic rays )

    What else? ----- and my personal likings micro-quasar/x-ray binaries IR background radiation; quantum gravity; exotics and enigma

    Views and prospects

    ultimate IACT and stereo techniques ?

  • A decade of years,since TeV window was opened. TeV attemptChudakov,Porter,Break throughby imaging ray astronomy proposedBy Hayakawa, Morrison..

  • Cosmological gamma-ray horizonCMB at z=100Cutoff due to + CMB e+ + e-Fazio & Stecker 1970 Nature 226, 135zmax10 GeV gamma-rays can explore the Universe up to z=100!10GeV

  • MAGIC concept : big dish: a role of the key(1) Lower threshold energy (2) good accuracy

    MAGIC : 17m H.E.S.S. & VERITAS 12m CANGAROO :10mA2 is about 10-2 of detection area S.

    (5m)2 X 10 = (16m)2(7m)2 X 10 = (22m)2

    How big the dish size, A, will be?

  • A vision of the future of HE, VHE Gamma Ray Astronomy tadashi kifune (shinshu/cangaroo) for the inauguration of the MAGIC telescope !fun and pleasure to dream about a magical world.

    Vision needs to be presented in a logical way based on : the present status, instrumentation and science in the future MAGIC inauguration October 10, 2003, La Palma

  • VHENext Generation IACTs, and CANGAROO

    Tide and

    What we CAN DO and 2 X 17m; 25m; 7 x 12m;