An Evolutionary Model for the Milky Way’s Corona

Sipma, Sten (2024) An Evolutionary Model for the Milky Way’s Corona. Master's Thesis / Essay, Astronomy.

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Abstract

The study of the circumgalactic medium (CGM) around late-type galaxies is crucial due to its ties to several open problems in the field, like the missing baryon problem, and the question of how cool gas is accreted onto the galaxy to sustain the star formation over a long period of time. The CGM spans a large volume, and is therefore able to contain a large amount of gas that can, overtime, efficiently feed the galaxy. In this work, we focus in particular on the hot phase of CGM, also known as the corona, around the Milky Way and Milky Way-mass galaxies. We study the evolution of such a corona using a semi-analytical model assuming that it is in hydrostatic equilibrium, but evolves via radiative cooling and different forms of heating. We implement evolution by cooling using a classical cooling function and by a more modern code which also includes heating from the extragalactic ultraviolet background. Moreover, we implement mechanical heating from a central source, resembling the source that inflated the Fermi and eROSITA bubbles, by continuously injecting energy in inner few kpc of the system. Our results show that in isolation, the centre of the corona cools rapidly within ∼ 10 Myr, while the outer regions remain relatively unchanged, but flows inwards at constant mass accretion rates between 0.2 and 1 M⊙ /yr, depending on the mass of our corona. ... (full abstract in pdf)

Item Type:	Thesis (Master's Thesis / Essay)
Supervisor name:	Fraternali, F.
Degree programme:	Astronomy
Thesis type:	Master's Thesis / Essay
Language:	English
Date Deposited:	10 Oct 2024 10:39
Last Modified:	10 Oct 2024 10:39
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/34309

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