Precise estimation of Extragalactic Background Light through GeV-TeV gamma-ray observation for distant blazars

• Project/Area Number: 15K17652
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hiroshima University
• Principal Investigator: Yasuyuki Tanaka 広島大学, 宇宙科学センター, 特任助教 (90633941)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥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)
• 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

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.

Research Products

• [Int'l Joint Research] SLAC(米国)
• [Int'l Joint Research] Nicolaus Copernicus Astronomical Center/Jagiellonian University(ポーランド)
• [Int'l Joint Research] Naval Research Laboratory/NASA Goddard Space Flight Center/Stanford University(米国)
• [Int'l Joint Research] Jagiellonian University/Nicolaus Copernicus Astronomical Center(ポーランド)
• [Int'l Joint Research] 上海天文台(中国)
• [Journal Article] Disk Jet Connection in Active Supermassive Black Holes in the Standard Accretion Disk Regime (2017)
  • Author(s): Inoue, Yoshiyuki; Doi, Akihiro; Tanaka, Yasuyuki T.; Sikora, Marek; Madejski, Grzegorz M.
  • Journal Title: ApJ Volume: 840 Issue: 1 Pages: 46-46
  • DOI: 10.3847/1538-4357/aa6b57
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A measurement of interstellar polarization and an estimation of Galactic extinction for the direction of the X-ray black hole binary V404 Cygni (2017)
  • 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
  • Journal Title: PASJ Volume: 印刷中 Issue: 2 Pages: 25-31
  • DOI: 10.1093/pasj/psw130
  • Peer Reviewed
• [Journal Article] High energy gamma rays from nebulae associated with extragalactic microquasars and ultra-luminous X-ray sources (2017)
  • Author(s): Inoue, Y., Lee, S., Tanaka, Y. T., Kobayashi, S. B.
  • Journal Title: ELSEVIER Volume: 90 Pages: 14-19
  • DOI: 10.1016/j.astropartphys.2017.01.012
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Systematic Study of Gamma-ray-bright Blazars with Optical Polarization and Gamma-Ray Variability (2016)
  • 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
  • Journal Title: The Astrophysical Journal Volume: 833 Issue: 1 Pages: 77-77
  • DOI: 10.3847/1538-4357/833/1/77
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases for Low Luminosity BL Lacs (2016)
  • Author(s): Inoue, Yoshiyuki; Tanaka, Yasuyuki T.
  • Journal Title: ApJ Volume: 828 Issue: 1 Pages: 13-13
  • DOI: 10.3847/0004-637x/828/1/13
  • Peer Reviewed
• [Journal Article] Binary black hole merger rates inferred from luminosity function of ultra-luminous X-ray sources (2016)
  • Author(s): Y. Inoue, Y.T. Tanaka, N. Isobe
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 461 Issue: 4 Pages: 4329-4334
  • DOI: 10.1093/mnras/stw1637
  • Peer Reviewed / Open Access
• [Journal Article] The soft gamma-ray detector (SGD) onboard ASTRO-H (2016)
  • Author(s): Shin Watanabe, Yuto Ichinohe (9/42), et al.
  • Journal Title: Proc. SPIE 9905, Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray Volume: 9905 Pages: 990513-990513
  • DOI: 10.1117/12.2231962
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The ASTRO-H (Hitomi) x-ray astronomy satellite (2016)
  • Author(s): Takahashi, T. et al.
  • Journal Title: Proceedings of the SPIE Volume: 9905 Pages: 990510-11
  • DOI: 10.1117/12.2232379
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The quiescent intracluster medium in the core of the Perseus cluster (2016)
  • Author(s): Hitomi Collaboration et al.
  • Journal Title: Nature Volume: 535 Issue: 7610 Pages: 117-121
  • DOI: 10.1038/nature18627
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] EVN Observations of HESS J1943+213: Evidence for an Extreme TeV BL Lac Object (2016)
  • Author(s): Akiyama K., Stawarz L., Tanaka Y., Nagai H., Giroletti M., Honma M.,
  • Journal Title: The Astrophysical Journal Letters Volume: 823 Issue: 2 Pages: L26-L26
  • DOI: 10.3847/2041-8205/823/2/l26
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Hitomi Constraints on the 3.5 keV Line in the Perseus Galaxy Cluster (2016)
  • Author(s): Aharonian, F. A., Akamatsu, H, Terada, Y. et al (Hitomi collaboration)
  • Journal Title: The Astrophysical Journal Letters Volume: 837 Issue: 1 Pages: 15-23
  • DOI: 10.3847/2041-8213/aa61fa
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] No Evidence of Intrinsic Optical/Near-Infrared Linear Polarization for V404 Cygni During its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters (2016)
  • Author(s): Y. T. Tanaka et al.
  • Journal Title: Astrophysical Journal Volume: in press
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A significant hardening and rising shape detected in the MeV/GeV nuFnu spectrum from the recently-discovered very-high-energy blazar S4 0954+65 during the bright optical flare in 2015 February (2016)
  • Author(s): Y. T. Tanaka et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: in press
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Lower Bound on the Cosmic TeV Gamma-Ray Background Radiation (2016)
  • Author(s): Y. Inoue and Y. T. Tanaka
  • Journal Title: Astrophysical Journal Volume: 818 Issue: 2 Pages: 187-192
  • DOI: 10.3847/0004-637x/818/2/187
  • Peer Reviewed / Open Access
• [Journal Article] Optical I-band Linear Polarimetry of the Magnetar 4U 0142+61 with Subaru (2015)
  • Author(s): Z. Wang, Y. T. Tanaka et al.
  • Journal Title: Astrophysical Journal Volume: 814 Issue: 2 Pages: 89-93
  • DOI: 10.1088/0004-637x/814/2/89
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The Third Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope (2015)
  • Author(s): M. Ackermann, Y. T. Tanaka et al.
  • Journal Title: Astrophysical Journal Volume: 810 Issue: 1 Pages: 14-47
  • DOI: 10.1088/0004-637x/810/1/14
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Prospect for future MeV gamma-ray active galactic nuclei population studies (2015)
  • Author(s): Y. Inoue, Y. T. Tanaka et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 4 Pages: 76-85
  • DOI: 10.1093/pasj/psv043
  • Peer Reviewed
• [Journal Article] Time-dependent Modeling of Gamma-Ray Flares in Blazar PKS1510-089 (2015)
  • Author(s): S. Saito, L. Stawarz, Y. T. Tanaka et al.
  • Journal Title: Astrophysical Journal Volume: 809 Issue: 2 Pages: 171-180
  • DOI: 10.1088/0004-637x/809/2/171
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An emergence of a new polarized emission region in blazar Mrk 421 associated with an X-ray flare (2015)
  • Author(s): R. Itoh, Y. Fukazawa, Y. T. Tanaka et al.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 3 Pages: 45-53
  • DOI: 10.1093/pasj/psv016
  • Peer Reviewed
• [Journal Article] Fermi Large Area Telescope Third Source Catalog (2015)
  • Author(s): F. Acero, Y. T. Tanaka et al.
  • Journal Title: Astrophysical Journal Supplement Series Volume: 218 Issue: 2 Pages: 23-63
  • DOI: 10.1088/0067-0049/218/2/23
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] ジェットを伴う潮汐破壊現象におけるガンマ線放射の探索と放射機構の解明 (2017)
  • Author(s): 田中康之、井上芳幸
  • Organizer: 日本天文学会春季大会
  • Place of Presentation: 九州大学
  • Year and Date: 2017-03-15
• [Presentation] IceCube neutrino の電磁波 ToO 観測の現状と今後 (2017)
  • Author(s): 田中康之
  • Organizer: 突発・変動天体の多波長連携観測
  • Place of Presentation: 茨城大学
  • Year and Date: 2017-03-06
• [Presentation] フェルミ衛星の現状とIceCubeニュートリノイベントの可視近赤外線フォローアップ観測 (2017)
  • Author(s): 田中康之
  • Organizer: マルチメッセンジャー天文学研究会
  • Place of Presentation: 千葉大学
  • Year and Date: 2017-03-03
  • Invited
• [Presentation] フェルミ衛星によるMeV/GeVガンマ線観測の成果とフェルミからの期待 (2017)
  • Author(s): 田中康之
  • Organizer: 第１回MeVガンマ線天文学研究会
  • Place of Presentation: 京都大学
  • Year and Date: 2017-02-28
  • Invited
• [Presentation] IceCube 高エネルギーニュートリノ事象の可視近赤外線フォローアッ プ観測 (2017)
  • Author(s): 田中康之
  • Organizer: 木曽広視野サーベイと京都 3.8m 即時分光によるタイムドメイン天文学の推進
  • Place of Presentation: 京都大学
  • Year and Date: 2017-02-21
• [Presentation] 大学間連携によるニュートリノイベントフォローアップ観測の提案 (2016)
  • Author(s): 田中康之
  • Organizer: 第 7 回光赤外線大学間連携ワークショップ
  • Place of Presentation: 京都大学
  • Year and Date: 2016-11-21
• [Presentation] No Evidence of Intrinsic Optical/Near-Infrared Linear Polarization for V404 Cygni During its Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters (2016)
  • Author(s): Yasuyuki Tanaka
  • Organizer: INTEGRAL 2016 Conference
  • Place of Presentation: アムステルダム、オランダ
  • Year and Date: 2016-10-11
  • Int'l Joint Research
• [Presentation] GeV - TeV ガンマ線データによる HBL 天体の平均 SED とTeV ガンマ線背景放射の赤方偏移分布 (2016)
  • Author(s): 田中康之、井上芳幸、深沢泰司
  • Organizer: 日本天文学会秋季大会
  • Place of Presentation: 愛媛大学
  • Year and Date: 2016-09-14
• [Presentation] ブラックホール連星V404 Cygにおけるジェット放射への制限: 可視近赤外線偏光観測と広帯域スペクトルモデリング (2016)
  • Author(s): 田中康之ほか
  • Organizer: 日本天文学会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-14
• [Presentation] ブラックホール連星 V404 Cyg の多波長観測: マイクロクエーサーにおけるジェットパラメータへの制限 (2015)
  • Author(s): 田中康之
  • Organizer: 高エネルギー宇宙物理学研究会2015
  • Place of Presentation: 静岡県沼津市
  • Year and Date: 2015-11-25
  • Invited
• [Presentation] No Evidence of Intrinsic Optical Near-Infrared Linear Polarization and Fermi-LAT Observation for V404 Cyg during the Bright Outburst in 2015: Broadband Modeling and Constraint on Jet Parameters (2015)
  • Author(s): Y. T. Tanaka et al.
  • Organizer: Sixth International Fermi Symposium
  • Place of Presentation: Arlington, USA
  • Year and Date: 2015-11-09
  • Int'l Joint Research
• [Presentation] Fermi-LAT and multi-wavelength observation of new TeV-emitting blazar S4 0954+65 during bright optical flare in 2015 Februrary (2015)
  • Author(s): 田中康之ほか
  • Organizer: 日本天文学会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] Blazar Studied in X-rays with Suzaku, MAXI, and Future Astro-H (2015)
  • Author(s): Y. T. Tanaka
  • Organizer: Relativistic Jets: Creation, Dynamics, and Internal Physics
  • Place of Presentation: Krakow, Poland
  • Year and Date: 2015-04-20
  • Int'l Joint Research / Invited
• [Book] CTA Contributions to the 34th International Cosmic Ray Conference (ICRC2015) (2015)
  • Author(s): CTA Consortium, A. Abchiche, Y. T. Tanaka et al.
  • Total Pages: 100
  • Publisher: Proceedings of Science