On the Temporal Variability of the Galactic Multi-TeV Interstellar Emissions
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arXiv
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| Format: | Preprint |
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2024
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| author | Marinos, P. D. Porter, T. A. Rowell, G. P. Jóhannesson, G. Moskalenko, I. V. |
| author_facet | Marinos, P. D. Porter, T. A. Rowell, G. P. Jóhannesson, G. Moskalenko, I. V. |
| contents | We use the GALPROP cosmic ray (CR) framework to model the Galactic CR distributions and associated non-thermal diffuse emissions up to PeV energies. We consider ensembles of discrete, finite lifetime CR sources, e.g.\ supernova remnants (SNRs), for a range of creation rates and lifetimes. We find that global properties of the CR sources are likely not directly recoverable from the current `snapshot' of the historic injection and propagation of CRs within the Galaxy that are provided by the data. We show that models for the diffuse $γ$ rays based on the discrete/time-dependent scenarios we consider are able to explain LHAASO very-/ultra-high energy (VHE/UHE) $γ$-ray data with up to 50\% contribution by unresolved leptonic sources at the highest energies. Over the models that we consider, variations in the diffuse VHE emissions can be $\sim$25\%, which is comparable to those for steady-state models that we investigated in earlier work. Such variations due to the discrete/finite nature of the CR sources are an important factor that are necessary to construct accurate physical models of the diffuse emissions from the Galaxy at VHE/UHEs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_03553 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | On the Temporal Variability of the Galactic Multi-TeV Interstellar Emissions Marinos, P. D. Porter, T. A. Rowell, G. P. Jóhannesson, G. Moskalenko, I. V. High Energy Astrophysical Phenomena We use the GALPROP cosmic ray (CR) framework to model the Galactic CR distributions and associated non-thermal diffuse emissions up to PeV energies. We consider ensembles of discrete, finite lifetime CR sources, e.g.\ supernova remnants (SNRs), for a range of creation rates and lifetimes. We find that global properties of the CR sources are likely not directly recoverable from the current `snapshot' of the historic injection and propagation of CRs within the Galaxy that are provided by the data. We show that models for the diffuse $γ$ rays based on the discrete/time-dependent scenarios we consider are able to explain LHAASO very-/ultra-high energy (VHE/UHE) $γ$-ray data with up to 50\% contribution by unresolved leptonic sources at the highest energies. Over the models that we consider, variations in the diffuse VHE emissions can be $\sim$25\%, which is comparable to those for steady-state models that we investigated in earlier work. Such variations due to the discrete/finite nature of the CR sources are an important factor that are necessary to construct accurate physical models of the diffuse emissions from the Galaxy at VHE/UHEs. |
| title | On the Temporal Variability of the Galactic Multi-TeV Interstellar Emissions |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2411.03553 |