Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 78: Kosmische Strahlung IV
T 78.5: Vortrag
Donnerstag, 22. März 2018, 17:30–17:45, Philo-HS6
Cosmic ray production in superwinds generated by starbursts — •Ana Laura Müller1,2,4, Gustavo Esteban Romero1,3, and Markus Roth2 — 1Instituto Argentino de Radioastronomía (CCT-La Plata, CONICET; CICPBA), Villa Elisa, Argentina — 2Institut für Kernphysik (Karlsruher Institut für Technologie), Karlsruhe, Deutschland — 3Facultad de Ciencias Astronómicas y Geofísicas (Universidad Nacional de La Plata), La Plata, Argentina — 4Instituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM), Buenos Aires, Argentina
Starburst galaxies have an exceptionally high rate of star formation. Stellar winds of massive stars and supernova explosions produce a high-temperature cavity in the nuclear region of these objects. This very hot gas expands adiabatically and escapes from the galaxy creating a superwind which sweeps matter from the galactic disk. The collision of the superwind with the halo and swept-up material generates shock waves and turbulent conditions where cosmic rays might be accelerated up to high energies. We present our results for the acceleration rate, particle distributions, and non-thermal emission resulting from this astrophysical scenario in the case of nearby galaxy NGC 253. We conclude that NGC 253 and galaxies with similar starbursts can only accelerate heavy nuclei up to ∼ 1018 eV unless some very special conditions occur. Further research is necessary to assess quantitatively this latter possibility.