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  Gamma-ray emission from spectrally resolved cosmic rays in galaxies

Werhahn, M., Girichidis, P., Pfrommer, C., & Whittingham, J. (2023). Gamma-ray emission from spectrally resolved cosmic rays in galaxies. Monthly Notices of the Royal Astronomical Society, 525(3), 4437-4455. doi:10.1093/mnras/stad2105.

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アイテムのパーマリンク: https://hdl.handle.net/21.11116/0000-000E-083A-9 版のパーマリンク: https://hdl.handle.net/21.11116/0000-000E-083B-8
資料種別: 学術論文

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Gamma-ray emission from spectrally resolved cosmic rays in galaxies.pdf (全文テキスト(全般)), 5MB
 
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Gamma-ray emission from spectrally resolved cosmic rays in galaxies.pdf
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 作成者:
Werhahn, Maria1, 著者           
Girichidis, Philipp, 著者
Pfrommer, Christoph, 著者
Whittingham, Joseph, 著者
所属:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 要旨: Cosmic rays (CRs) are ubiquitous in the interstellar medium (ISM) of nearby galaxies, but many of their properties are not well-constrained. Gamma-ray observations provide a powerful tool in this respect, allowing us to constrain both the interaction of CR protons with the ISM and their transport properties. To help better understand the link between observational signatures and CR physics, we use a series of magneto-hydrodynamical arepo simulations of isolated galaxies performed using spectrally resolved CR transport in every computational cell, with subsequent gamma-ray emission calculated using the Crayon + (Cosmic RAY emissiON) code. In each of our simulated haloes, modelling the energy-dependent spatial diffusion of CRs leads to a more extended distribution of high-energy (~100 GeV) gamma rays compared to that predicted by a ‘grey’ steady-state model, which is especially visible in the corresponding emission maps and radial profiles. Despite this, the total gamma-ray spectra can often be well approximated by the steady-state model, although recovering the same spectral index typically requires a minor variation of the energy dependence of the diffusion coefficient. Our simulations reproduce the observed shapes of the gamma-ray spectra of nearby star-forming galaxies and also match recent observations of the far infrared–gamma-ray relation. We find, however, that the spectrally resolved model yields marginally smaller luminosities for lower star formation rates compared to grey simulations of CRs. Our work highlights the importance of modelling spectrally resolved CR transport for an accurate prediction of spatially resolved high-energy gamma-ray emission, as will be probed by the upcoming Cherenkov Telescope Array observatory.

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言語: eng - English
 日付: 2023-09-25
 出版の状態: オンラインで出版済み
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 査読: 査読あり
 識別子(DOI, ISBNなど): DOI: 10.1093/mnras/stad2105
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出版物名: Monthly Notices of the Royal Astronomical Society
  その他 : Mon. Not. R. Astron. Soc.
種別: 学術雑誌
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出版社, 出版地: Oxford : Oxford University Press
ページ: - 巻号: 525 (3) 通巻号: - 開始・終了ページ: 4437 - 4455 識別子(ISBN, ISSN, DOIなど): ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150