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Recent Advances in Very High Energy Gamma-Ray Astrophysics: Insightful Discoveries

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nuru
42 diapositives · 590 Views · Aug 24, 2014

Join us as we explore the latest findings in very high energy gamma-ray astrophysics, presented by Masaki Mori from the University of Tokyo. This talk covers significant topics including the supernova remnants SN1006 and RX J1713.7-3946, probing the Galactic Center, and the pulsar binary PSR 1259-63/SS2883. We will delve into emission mechanisms, advanced observational results from CANGAROO and H.E.S.S., and the implications on cosmic ray origins. This advancing field is crucial for understanding both galactic and extragalactic high-energy phenomena.

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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