Fermi-bubble bulk and edge analysis reveals dust, cooling breaks, and cosmic-ray diffusion, facilitating a self-consistent model

Autor:	Keshet, Uri, Gurwich, Ilya, Lavi, Assaf, Avitan, Dina, Linnik, Teodor
Rok vydání:	2023
Předmět:	Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
Popis:	The full, radio to $\gamma$-ray spectrum of the Fermi bubbles is shown to be consistent with standard strong-shock electron acceleration at the bubble edge, without the unnatural energy cutoffs and unrealistic electron cooling of previous studies, if the ambient interstellar radiation is strong; the $\gamma$-ray cooling break should then have a microwave counterpart, undetected until now. Indeed, a broadband bubble-edge analysis uncovers a pronounced downstream dust component, which masked the anticipated $\sim35$ GHz spectral break, and the same overall radio softening consistent with Kraichnan diffusion previously reported in $\gamma$-rays. Comment: To appear in ApJ
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2311.08459 Zobrazit plný text záznamu View this record from Arxiv