ASIAA Summer Students Program
ASIAA Summer Student Program 2022
July 1 - August 31

2022 Project Description

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Probing Gas flows from Superbubbles to the Circumgalactic Medium with the Hubble Space Telescope

Hubble Space Telescope
Interstellar and Circumgalactic Media
Multiwavelength Astronomy


You-Hua Chu & Ting-Wen Lan
Find out more about supervisors on ASIAA website

Task Description and Goals

Massive stars have been considered as an important source of feedback mechanisms that drive galaxy evolution. They regulate the gas content in galaxies by expelling surrounding gas into the interstellar (ISM) and circumgalactic media (CGM). The energy feedback from massive stars produce interstellar structures from bubbles and superbubbles on scales of 10-100 pc, to supergiant shells on scales of 1000 pc, and even a hot gas halo on the galactic scale. All of these structures contain hot (10^6 K) ionized gas produced by fast stellar winds and supernovae from massive stars. This project aims to better understand the distribution of hot gas, how hot gas is ejected from the disk plane to the halo of a galaxy, and how the galactic hot ISM flows to the CGM. The laboratory galaxy is the Large Magellanic Cloud (LMC) at a known distance of 50 kpc with low foreground extinction and confusion. This project will obtain novel measurements of gas properties by utilizing the high-dispersion UV spectra from the Hubble Space Telescope program UV Legacy Library of Young Stars as Essential Standards (ULLYSES). ULLYSES includes ~150 targets in the LMC and its data are immediately archived for public use. We will use massive stars in LMC as background light to probe all the multiphase gas structures along the line of sight, including the bubbles/superbubbles around massive stars and the ISM/CGM of LMC, via their gas absorption features imprinted in the stellar spectra. The results of this project will provide strong constraints on all current and future models of stellar feedback and galaxy evolution. In this project, the student will (1) work on the state-of-the-art UV spectroscopic dataset, (2) perform the absorption line spectroscopic measurements, (3) learn the astrophysics of stellar feedback and galaxy evolution.

Required Background

1. Basic/advanced knowledge in astrophysics is preferred, but not mandatory. 2. Basic knowledge and skills of computer programming (such as Python) would be desirable. 3. Passion for astrophysical research, independent thinking, and hard working.

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