Item type |
デフォルトアイテムタイプ_(フル)(1) |
公開日 |
2023-03-18 |
タイトル |
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タイトル |
Observations of the Large Magellanic Cloud with Fermi |
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言語 |
en |
作成者 |
Fukazawa, Yasushi
Hanabata, Yoshitaka
Katagiri, Hideaki
Mizuno, Tsunefumi
Ohsugi, Takashi
Takahashi, Hiromitsu
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
権利情報 |
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権利情報 |
Copyright (c) 2010 The European Southern Observatory |
主題 |
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主題Scheme |
Other |
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主題 |
acceleration of particles |
主題 |
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主題Scheme |
Other |
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主題 |
cosmic rays |
主題 |
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主題Scheme |
Other |
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主題 |
Magellanic Clouds |
主題 |
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主題Scheme |
Other |
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主題 |
gamma rays: galaxies |
主題 |
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主題Scheme |
NDC |
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主題 |
440 |
内容記述 |
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内容記述 |
Context. The Large Magellanic Cloud (LMC) is to date the only normal external galaxy that has been detected in high-energy gamma rays. High-energy gamma rays trace particle acceleration processes and gamma-ray observations allow the nature and sites of acceleration to be studied. Aims. We characterise the distribution and sources of cosmic rays in the LMC from analysis of gamma-ray observations. Methods. We analyse 11 months of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope and compare it to tracers of the interstellar medium and models of the gamma-ray sources in the LMC. Results. The LMC is detected at 33σ significance. The integrated >100 MeV photon flux of the LMC amounts to (2.6 ± 0.2) × 10-7 ph cm-2 s-1 which corresponds to an energy flux of (1.6 ± 0.1) × 10-10 erg cm-2 s-1, with additional systematic uncertainties of 16%. The analysis reveals the massive star forming region 30 Doradus as a bright source of gamma-ray emission in the LMC in addition to fainter emission regions found in the northern part of the galaxy. The gamma-ray emission from the LMC shows very little correlation with gas density and is rather correlated to tracers of massive star forming regions. The close confinement of gamma-ray emission to star forming regions suggests a relatively short GeV cosmic-ray proton diffusion length. Conclusions. The close correlation between cosmic-ray density and massive star tracers supports the idea that cosmic rays are accelerated in massive star forming regions as a result of the large amounts of kinetic energy that are input by the stellar winds and supernova explosions of massive stars into the interstellar medium. |
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言語 |
en |
出版者 |
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出版者 |
EDP Sciences S A |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
10.1051/0004-6361/200913474 |
関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
http://dx.doi.org/10.1051/0004-6361/200913474 |
収録物識別子 |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0004-6361 |
収録物識別子 |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00553195 |
開始ページ |
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開始ページ |
A7-1 |
書誌情報 |
Astronomy & Astrophysics
Astronomy & Astrophysics
巻 512,
p. A7-1-A7-15,
発行日 2010
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旧ID |
31168 |