Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center
The very high energy (VHE) emission of the central molecular zone (CMZ) is rarely modeled in 3D. Most approaches describe the morphology in 1D or simplify the diffusion to the isotropic case. In this work, we show the impact of a realistic 3D magnetic field configuration and gas distribution on the...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ad2ea1 |
| _version_ | 1797201766700285952 |
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| author | J. Dörner J. Becker Tjus P. S. Blomenkamp H. Fichtner A. Franckowiak E. M. Zaninger |
| author_facet | J. Dörner J. Becker Tjus P. S. Blomenkamp H. Fichtner A. Franckowiak E. M. Zaninger |
| author_sort | J. Dörner |
| collection | DOAJ |
| description | The very high energy (VHE) emission of the central molecular zone (CMZ) is rarely modeled in 3D. Most approaches describe the morphology in 1D or simplify the diffusion to the isotropic case. In this work, we show the impact of a realistic 3D magnetic field configuration and gas distribution on the VHE γ -ray distribution of the CMZ. We solve the 3D cosmic-ray transport equation with an anisotropic diffusion tensor using the approach of stochastic differential equations as implemented in the CRPropa framework. We test two different source distributions for five different anisotropies of the diffusion tensor, covering the range of effectively fieldline-parallel diffusion to isotropic diffusion. Within the tested magnetic field configuration, the anisotropy of the diffusion tensor is close to the isotropic case, and three point sources within the CMZ are favored. Future missions such as the upcoming CTA will reveal more small-scale structures that are not yet included in the model. Therefore, a more detailed 3D gas distribution and magnetic field structure will be needed. |
| first_indexed | 2024-04-24T07:52:46Z |
| format | Article |
| id | doaj.art-f6dfd56cb7104c1cad86f880abbaaacc |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T07:52:46Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-f6dfd56cb7104c1cad86f880abbaaacc2024-04-18T08:56:07ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01965218010.3847/1538-4357/ad2ea1Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic CenterJ. Dörner0https://orcid.org/0000-0001-6692-6293J. Becker Tjus1https://orcid.org/0000-0002-1748-7367P. S. Blomenkamp2https://orcid.org/0000-0002-5032-5896H. Fichtner3https://orcid.org/0000-0002-9151-5127A. Franckowiak4https://orcid.org/0000-0002-5605-2219E. M. Zaninger5Theoretische Physik IV, Fakultät für Physik & Astronomie, Ruhr-Universität Bochum , 44780 Bochum, Germany; Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum , 44780 Bochum, GermanyTheoretische Physik IV, Fakultät für Physik & Astronomie, Ruhr-Universität Bochum , 44780 Bochum, Germany; Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum , 44780 Bochum, Germany; Department of Space, Earth and Environment, Chalmers University of Technology , 412 96 Gothenburg, SwedenRuhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum , 44780 Bochum, Germany; Astronomisches Institut, Fakultät für Physik & Astronomie, Ruhr-Universität Bochum , 44780 Bochum, GermanyTheoretische Physik IV, Fakultät für Physik & Astronomie, Ruhr-Universität Bochum , 44780 Bochum, Germany; Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum , 44780 Bochum, GermanyRuhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum , 44780 Bochum, Germany; Astronomisches Institut, Fakultät für Physik & Astronomie, Ruhr-Universität Bochum , 44780 Bochum, GermanyTheoretische Physik IV, Fakultät für Physik & Astronomie, Ruhr-Universität Bochum , 44780 Bochum, Germany; Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Ruhr-Universität Bochum , 44780 Bochum, GermanyThe very high energy (VHE) emission of the central molecular zone (CMZ) is rarely modeled in 3D. Most approaches describe the morphology in 1D or simplify the diffusion to the isotropic case. In this work, we show the impact of a realistic 3D magnetic field configuration and gas distribution on the VHE γ -ray distribution of the CMZ. We solve the 3D cosmic-ray transport equation with an anisotropic diffusion tensor using the approach of stochastic differential equations as implemented in the CRPropa framework. We test two different source distributions for five different anisotropies of the diffusion tensor, covering the range of effectively fieldline-parallel diffusion to isotropic diffusion. Within the tested magnetic field configuration, the anisotropy of the diffusion tensor is close to the isotropic case, and three point sources within the CMZ are favored. Future missions such as the upcoming CTA will reveal more small-scale structures that are not yet included in the model. Therefore, a more detailed 3D gas distribution and magnetic field structure will be needed.https://doi.org/10.3847/1538-4357/ad2ea1Galactic cosmic raysGalactic centerGamma-rays |
| spellingShingle | J. Dörner J. Becker Tjus P. S. Blomenkamp H. Fichtner A. Franckowiak E. M. Zaninger Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center The Astrophysical Journal Galactic cosmic rays Galactic center Gamma-rays |
| title | Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center |
| title_full | Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center |
| title_fullStr | Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center |
| title_full_unstemmed | Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center |
| title_short | Impact of Anisotropic Cosmic-Ray Transport on the Gamma-Ray Signatures in the Galactic Center |
| title_sort | impact of anisotropic cosmic ray transport on the gamma ray signatures in the galactic center |
| topic | Galactic cosmic rays Galactic center Gamma-rays |
| url | https://doi.org/10.3847/1538-4357/ad2ea1 |
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