2013 Fiscal Year Final Research Report
Gamma-ray emission and particle acceleration mechanisms of solar flares
| Project/Area Number |
24840031
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Hiroshima University |
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Principal Investigator |
TANAKA Yasuyuki 広島大学, 宇宙科学センター, 特任助教 (90633941)
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| Project Period (FY) |
2012-08-31 – 2014-03-31
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| Keywords | 太陽フレア / ガンマ線 / 粒子加速 |
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| Research Abstract |
Since the launch in 2008, Fermi-LAT has detected a lot of solar flare gamma-rays over several tens of events. The MeV/GeV gamma-ray spectra showed clear and significant turnover at several hundreds of MeV, indicating that the gamma-rays are produced via pion-decay process. The large photon statistics allowed us to pin-down the location of the emission region and we found that the gamma-ray emission site is around the Active Region on the solar surface. This implies that high-energy protons are produced at the Active region and that turbulent acceleration would be the most plausible option.
Fermi data analysis for Active Galactic Nuclei (AGN) were also performed. In particular, 2 very-high-energy gamma-ray photons were detected from the close vicinity of the z=1.1 blazar PKS 0426-380.
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[Journal Article] Two active states of the narrow-line gamma-ray-loud AGN GB 1310+4872014
Author(s)
K V Sokolovsky, F K Schizel, Y T Tanaka, P K Abolmasov, E Angelakis, A Bulgarelli, L Carrasco, S B Cenko, C Cheung, K I. Clubb, F D'Ammando, L Escande, S J Fegan, A V Filippenko, J Finke, L Fuhrmann, Y Fukazawa, E Hays, S E Healey, Y Ikejiri, and 32 co-authors
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Journal Title
Astronomy & Astrophysics
Volume: 565
Pages: 26-43
DOI
Peer Reviewed
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[Journal Article] Fermi-LAT and Suzaku observations of the radio galaxy Centaurus B2013
Author(s)
Katsuta J, Tanaka Y T, Stawarz L, O'Sullivan S P, Cheung C C, Kataoka J, Funk S, Yuasa T, Odaka H, Takahashi T, and Svoboda J
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Journal Title
Astronomy & Astrophysics
Volume: 550
Pages: 66-76
DOI
Peer Reviewed
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[Journal Article] Giant Lobes of Centaurus A Radio Galaxy Observed with the Suzaku X-Ray Satellite2013
Author(s)
Stawarz L, Tanaka Y T, Madejski G, O'Sullivan S P, Cheung C C, Feain I J, Fukazawa Y, Gandhi P, Hardcastle M J, Kataoka J, Ostrowski M, et al.
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Journal Title
Astrophysical Journal
Volume: 766
Pages: 48-66
DOI
Peer Reviewed
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[Journal Article] Fermi Large Area Telescope Detection of Two Very-High-Energy (E>100 GeV) Gamma-ray Photons from the z=1.1 Blazar PKS 0426-3802013
Author(s)
Y T Tanaka, C C Cheung, Y Inoue, Stawarz, M Ajello, C D Dermer, D L Wood, A Chekhtman, Y Fukazawa, T Mizuno, Ohno, D Paneque, and D J Thompson
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Journal Title
Astrophysical Journal Letters
Volume: 777
Pages: L18-L23
DOI
Peer Reviewed
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[Journal Article] Minute-scale Rapid Variability of the Optical Polarization in the Narrow-line Seyfert 1 Galaxy PMN J0948+00222013
Author(s)
R Itoh, Y T Tanaka, Y Fukazawa, K S Kawabata, K Kawaguchi, Y Moritani, K Takaki, I Ueno, M Uemura, H Akitaya, M Yoshida, T Ohsugi, H Hanayama, T Miyaji, and N Kawai
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Journal Title
Astrophysical Journal Letters
Volume: 775
Pages: L26-L31
DOI
Peer Reviewed
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[Journal Article] Dense Optical and Near-infrared Monitoring of CTA 102 during High State in 2012 with OISTER : Detection of Intra-night2013
Author(s)
R Itoh, Y Fukazawa, Y T Tanaka, Y Abe, H Akitaya, A Arai, M Hayashi, T Hori, M Isogai, H Izumiura, K S Kawabata, N Kawai, D Kuroda, R Miyanoshita, Y Moritani, T Morokuma, T Nagayama, J Nakamoto, C Nakata, Y Oasa, and 18 co- authors
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Journal Title
Orphan Polarized Flux Flare
Volume: 768
Pages: L24-L28
DOI
Peer Reviewed
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[Journal Article] High-Energy Gamma-Ray Emission From Solar Flares : Summary of Fermi LAT Detections and Analysis of Two M-Class Flares
Author(s)
M Ackermann, M Ajello, A Albert, A Allafort, L Baldini, G Barbiellini, D Bastieri, K Bechtol, R Bellazzini, E Bissaldi, E Bonamente, E Bottacini, and 150co-authors (including Y Tanaka) (Correspondingauthors : Y Tanaka, A Allafort, N Giglietto, N Omodei, and V Petrosian)
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Journal Title
Astrophysical Journal
Volume: (in press)
Peer Reviewed
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