Electronic Theses and Dissertations

Non-English Title

Los efectos del medio interestelar en la fuga de superburbujas

Date

2024

Document Type

Thesis

Degree Name

Master of Science

Department

Physics

Committee Chair

Benjamin Keller

Committee Member

Xiao Shen

Committee Member

Francisco Muller-Sanchez

Abstract

Outflows driven by cascading supernovae (SNe), which originate from star clusters in the disks of spiral galaxies have been proposed as one of many explanations for lower than expected star formation rates. These outflows send gas out where is unable to form stars as part of a larger process called stellar feedback. The gas is sent trough thin over-dense shells called superbubbles and several analytical models exist to predict their growth and larger effects on their host galaxies. We propose a new model inspired by Weaver et al. (1977), Orr et al. (2022) and Ostriker & McKee (1988) which consists of two growth functions of three phases each. We propose a energy driven starting phase and we account for hot interiors with no SNe as an intermediate energy conserving phase and cold interiors with SNe as an intermediate momentum driven phase. We considered both a constant and a power-law mechanical luminosity models for superbubble growth. We also apply Orr et al. (2022)’s procedure to find the parameters of the interstellar medium (ISM) that are more conducive to outflows and which lead to the superbubble mixing again with the ISM. We also use Genzel et al. (2010)’s data to calculate gas fractions and galactic rotation rates that are used in our analysis of breakout conditions. Our work suggests that for scale heights from 150 [pc] to 400 [pc] outflows are the main source of stellar feedback. It predicts cold driven and coasting outflows should happen at lower scale heights while hot driven and coasting outflows happen at higher scale heights. It also predicts that an ISM auspicious for breakout has a gas fraction higher than 0.25 at very low rotation rates or a gas fraction higher than 0.1 at a rotation of ∼ 10 [Gyr ⁻¹ ]

Comments

Data is provided by the student.

Library Comment

Dissertation or thesis originally submitted to ProQuest

Notes

Open Access

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