Precise estimation of Extragalactic Background Light through GeV-TeV gamma-ray observation for distant blazars
| Project/Area Number |
15K17652
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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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 |
Yasuyuki Tanaka 広島大学, 宇宙科学センター, 特任助教 (90633941)
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | ガンマ線 / 活動銀河核ジェット / 可視赤外線背景放射 / 活動銀河核 / ジェット |
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| Outline of Final Research Achievements |
Extragalactic Background Light (EBL) is known as cosmic optical and infrared background radiation and it is important to understand the origin. We analyzed multi-wavelength data from radio to GeV-TeV gamma-ray band for distant blazars and estimated the intensity of Extragalactic Background Light (EBL). Note that the observed GeV-TeV gamma-ray data are absorbed by annihilation with EBL photons, and hence to derive the intrinsic GeV-TeV spectrum, we need radio, optical, and X-ray data. Our result showed that the inferred EBL level is consistent with previously-obtained theoretical estimation, indicating that no significant contribution from other component such as dark matter is needed to explain the inferred EBL level.
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Report
(3 results)
Research Products
(39 results)
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[Journal Article] A measurement of interstellar polarization and an estimation of Galactic extinction for the direction of the X-ray black hole binary V404_Cygni2017
Author(s)
Itoh, Ryosuke; Tanaka, Yasuyuki T.; Kawabata, Koji S.; Uemura, Makoto; Watanabe, Makoto; Fukazawa, Yasushi; Kanda, Yuka; Akitaya, Hiroshi; Moritani, Yuki; Nakaoka, Tatsuya; Kawabata, Miho; Shiki, Kensei; Yoshida, Michitoshi; Oasa, Yumiko; Takahashi, Jun
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Journal Title
Publications of the Astronomical Society of Japan
Volume: 印刷中
Pages: 130-130
DOI
Related Report
Peer Reviewed
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[Journal Article] Systematic Study of Gamma-ray-bright Blazars with Optical Polarization and Gamma-Ray Variability2016
Author(s)
Itoh, R., Nalewajko, K., Fukazawa, Y., Uemura, M., Tanaka, Y.~T., Kawabata, K.~S., Madejski, G.~M., Schinzel, F.~K., Kanda, Y., Shiki, K., Akitaya, H., Kawabata, M., Moritani, Y., Nakaoka, T., Yoshida, M. 他6名
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Journal Title
ApJ
Volume: 833
Pages: 77-77
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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