In Person in Marlar and/or Virtual Brown Bag Lunch
Monday October 31, 2022 at 12:00 Link Below
Join BBL Zoom Meeting
Presentation in Marlar 37-252/37-272 for those wishing to attend in person
Juliana Garcia-Mejia, Harvard University, Center for Astrophysics at 12:05 (in person )
First Light Results from the Tierras Observatory, An Ultra-precise Time-series M-dwarf Photometer
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Eun-jin Shin, Seoul National University at 12:30 pm (remote)
Star-formation variability as a probe for the baryon cycle within galaxies
Abstract: We present new results on the connection of the regulation of star formation and the cycling of baryons in-and-out and within galaxies. We use idealized numerical simulations of Milky Way-mass galaxies, in which we vary the stellar feedback strength and morphological setup (B/T ratio). Tracking individual gas parcels for 250 Myr, we analyze the gas cycle within the various galaxies and quantify how gas moves and oscillates through the different phases of the interstellar medium and forms stars. We then put forward how the variability of star formation can be used as a probe of the baryon cycle within galaxies by investigating the temporal and spatial power spectrum density (PSD) of the star formation history (SFH). We conclude that observations of the temporal and spatial PSD of the SFH enable us to shed new light onto the baryon cycle and the star-formation process.
Bio: I am a PhD candidate working in my fifth year with Ji-hoon Kim at Seoul National University. My research focuses on star formation and baryon cycles under various galactic circumstances, including isolated and merging galaxies. Participating in the AGORA code comparison project I investigated how the metallicity evolve in galaxies with different hydrodynamic simulation codes. Also, I’ve studied a formation scenario of dark matter-deficient galaxies and predicted the observational properties of collision-induced dark matter deficient galaxies.