Exploring the collisionless shocks by suing multi-wavelength spectra of AGN fossil shell emission
| Project/Area Number |
25800099
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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 |
Astronomy
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| Research Institution | Kure National College of Technology |
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Principal Investigator |
KAWAKATU NOZOMU 呉工業高等専門学校, 自然科学系分野, 准教授 (30450183)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | 理論天文学 / 無衝突衝撃波 / 相対論的ジェット / 超巨大ブラックホール |
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| Outline of Final Research Achievements |
We theoretically evaluate the evolution of the emission from both the lobe and the shell, which are composed of shocked jet matter (i.e., cocoon) and a shocked ambient medium (i.e., shell). Based on a simple dynamical model of expanding lobe and shell, we clarify how the broadband spectrum of each component evolves before and after the cessation of the jet activity. (i) As a result, overall emission from the shell overwhelms that from the lobe at a wide range of frequencies from radio up to gamma-ray soon after the jet activity has ceased. Our result predicts a new class of dead radio sources that are dominated by shell emission. (ii) We examine the plasma composition of relativistic jets in four Fanaroff-Riley type II (FRII) radio galaxies by analysing the total cocoon pressure in terms of partial pressures of thermal and non-thermal electrons/positrons and protons. We find that the positron-free plasma comprising protons and electrons is ruled out.
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Report
(4 results)
Research Products
(18 results)
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[Journal Article] Fossil shell emission in dying radio loud AGNs2016
Author(s)
Kino, Motoki, Ito, Hirotaka, Kawakatu, Nsonomu, Orienti, Monica, Nagai, Hiroshi, Wajima, Kiyoaki, Itoh, Ryo
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Journal Title
Astronomische Nachrichten
Volume: 337
Issue: 1-2
Pages: 47-52
DOI
Related Report
Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
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