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Recent topics from very-high-energy gamma-ray astrophysics

Recent topics from very-high-energy gamma-ray astrophysics. 森　正樹 東京大学宇宙線研究所. 理論グループでの Talk 、 September 8, 2004. Topics. Supernova remnant SN1006 Supernova remnant RX J1713.7-3946 Galactic Center Pulsar binary PSR 1259-63/SS2883. SN1006: CANGAROO-I 3.8m results.

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Recent topics from very-high-energy gamma-ray astrophysics

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  1. Recent topics from very-high-energy gamma-ray astrophysics 森　正樹 東京大学宇宙線研究所 理論グループでのTalk、September 8, 2004

  2. Topics • Supernova remnant SN1006 • Supernova remnant RX J1713.7-3946 • Galactic Center • Pulsar binary PSR 1259-63/SS2883

  3. SN1006: CANGAROO-I 3.8m results Tanimori et al., ApJ Lett. 497, L25 (1998) 1992-1998

  4. SN1006 emission mechanism Inverse Compton from electrons Neutral pions from p-p interactions Naito et al. AN 320 (1999) Voelk et al. AA 396 (2002)

  5. SN1006: HEGRA CT1 • HEGRA CT1 (La Palma, Canary Is.) • 219hrs • >18TeV • 5 excess • Position within 0.1 of CANGAROO hotspot Gamma-ray signal = (ON) – (OFF)  (deg) Vitale et al. 28th ICRC (2003)

  6. Punch, Frontier Science 2004

  7. H.E.S.S.: completion in 2003 Four 12m telescopes (2 completed) in Namibia, Africa Max Planck Inst., Heidelberg, etc.

  8. Hofmann, Gamma2004

  9. Hofmann, Gamma2004

  10. H.E.S.S. vs CANGAROO My personal thoughts! • H.E.S.S. • Their detection area is very big! • Greater than the Cherenkov light pool: Really??? • Detailed analysis procedure not presented yet • But, • The Crab is seen reasonably well… • CANGAROO-I solid? • Re-analysis of old data is not easy… • We have CANGAROO-III data to be analyzed.

  11. CANGAROO-II 10m telescope • Parabola reflector consisting of 114 mirrors of 80cmφ(57m2), f=8m, F/0.8 • Camera: 3FOV, 552x 3/8”PMTs (0.12 pixel, Hamamatsu R4124UV) • Readout: q-ADC & TDC • In operation since 2000 March

  12. SNR RX J1713.7-3946 (1) Gamma-ray signal = (ON) – (OFF) • Detected in X-rays • Non-thermal X-ray spectrum Energy spectrum Enomoto et al. Nature 416 (2002) 823 Significance map

  13. SNR RX J1713.7-3946 (2) • Hard to explain by emission from electrons (Brems, IC) • Emission from protons (0)? • Cosmic ray origin? NANTEN results : Distance ~ 1 kpc Age ~ 1600yr Lp~1048erg ~ 0.001LSN (Fukui et al. PASJ 55, 2003) Enomoto et al. Nature 416 (2002) 823

  14. SNR RX J1713.7-3946 (3) 0.8 Counter arguments * Reimer & Pohl, A&A 390 (2002) L43 * Butt et al., Nature 418 (2002) 489

  15. Hofmann, Gamma2004

  16. Hofmann, Gamma2004

  17. Hofmann, Gamma2004

  18. SNR RX J1713.7-3946 as CR source? Still p-p origin is viable!

  19. New entry: Galactic center Gamma-ray signal (ON-OFF) • CANGAROO 10m result Tsuchiya et al., ApJ 606, L115 (2004)

  20. Galactic center: IC emission from SNR? In preparation Tsuchiya, Ph.D. thesis in preparation (2004)

  21. Hofmann, Gamma2004 Whipple [ApJ 607, 949 (2004)] H.E.S.S. [astro-ph/0408145]

  22. Hofmann, Gamma2004

  23. Hofmann, Gamma2004 CANGAROO Whipple H.E.S.S.

  24. Aharonian & Neronov, astro-ph/0408303 Emission from Sgr A*? p-p in the accretion disk + absorption

  25. Hooper, Perez, Silk, Ferrer, Sarker, astro-ph/0408303 Dark matter annihilation? (I) Assuming continuum (via W+W-, Z0Z0, qq) spectrum is dominant _ m =3TeV, J~104

  26. Horns, astro-ph/0408192 Dark matter annihilation? (2) m =18TeV =5104GeV/cm3

  27. Hofmann, Gamma2004 Kawachi et al. ApJ 607, 949(2004)

  28. Hofmann, Gamma2004 IAUC 8300

  29. Hofmann, Gamma2004

  30. Hofmann, Gamma2004

  31. Summary • Very high energy sources may contain large varieties, including both galactic and extragalactic objects. • TeV gamma-ray astronomy is becoming an indispensable field of astronomy. • The “third generation” Cherenkov telescopes are about to increase sensitivity –more fun!

  32. Hofmann, Gamma2004

  33. Hofmann, Gamma2004

  34. New entry: SNR RX J0852.0-4622 • CANGAROO 10m result 8o 5.3 excess Vela SNR Gamma-ray signal (ON-OFF) Preliminary! d~1kpc Maximum X-ray emission 2o Katagiri et al., 28th ICRC (2003)

  35. SNR RX J0852.0-4622: IC emission? In preparation Katagiri, Ph.D. thesis (2004)

  36. New entry: TeV J2032+4130 • Unidentified TeV source TeV J2032+4130 • Very hard spectrum E-1.9 • No counterpart in radio or X-rays Rowell et al., 28th ICRC (2003)

  37. Hofmann, Gamma2004

  38. Woomera, 2004 March T2 T4 T3 T1

  39. CANGAROO-III event samples

  40. New Cherenkov telescopes The “Big Four”

  41. MAGIC: completion in 2003 One 17m telescope in Canary Island Max Planck Inst., Munich, etc.

  42. VERITAS: VERITAS-4 by 2005, then -7 New site: Horseshoe canyon, Kitt Peak, Arizona Smithonian Inst. etc. Prototype (Aug ’03) Oct 2005: Completion of Phase I: 4 telescope array Oct 2007: Completion of Phase II: 7 telescope array

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