A5005902730- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
University of California, Davis
2020-2023
Abstract Spatial patterns of stellar elemental abundances encode rich information about a galaxy’s formation history. We analyze the radial, vertical, and azimuthal variations metals in stars, both today at formation, FIRE-2 cosmological simulations Milky Way (MW)-mass galaxies, we compare them with MW. The radial gradient is steeper (more negative) for younger which agrees MW, although gradients are shallower FIRE-2. Importantly, this age dependence was present already birth: only modestly...
We present the first measurement of lifetimes Giant Molecular Clouds (GMCs) in cosmological simulations at $z = 0$, using Latte suite FIRE-2 Milky Way-mass galaxies. track GMCs with total gas mass $\gtrsim 10^5$ M$_\odot$ high spatial ($\sim1$ pc), ($7100$ M$_{\odot}$), and temporal (1 Myr) resolution. Our simulated are consistent distribution masses for massive Way nearby find GMC $5-7$ Myr, or 1-2 freefall times, on average, less than 2$\%$ clouds living longer 20 Myr. decreasing...
We use FIRE-2 simulations to examine 3-D variations of gas-phase elemental abundances [O/H], [Fe/H], and [N/H] in 11 Milky Way (MW) M31-mass galaxies across their formation histories at $z \leq 1.5$ ($t_{\rm lookback} 9.4$ Gyr), motivated by characterizing the initial conditions stars for chemical tagging. Gas within $1$ kpc disk midplane is vertically homogeneous $\lesssim 0.008$ dex all 1.5$. find negative radial gradients (metallicity decreases with galactocentric radius) times, which...
ABSTRACT We characterize the 3D spatial variations of [Fe/H], [Mg/H], and [Mg/Fe] in stars at time their formation, across 11 simulated Milky Way (MW)- M31-mass galaxies FIRE-2 simulations, to inform initial conditions for chemical tagging. The overall scatter [Fe/H] within a galaxy decreased with until $\approx 7 \, \rm {Gyr}$ ago, after which it increased today: this arises from competition between reduction azimuthal steepening radial gradient abundance over time. is generally negative,...
Observations of the Milky Way's low-$\alpha$ disk show that at fixed metallicity, [Fe/H], several element abundance, [X/Fe], correlate with age, unique slopes and small scatters around age-[X/Fe] relations. In this study, we turn to simulations explore relations for elements C, N, O, Mg, Si, S, Ca are traced in a FIRE-2 cosmological zoom-in simulation Way-like galaxy, m12i, understand what physical conditions give rise observed trends. We first distributions mono-age populations their birth...
Spatial patterns of stellar elemental abundances encode rich information about a galaxy's formation history. We analyze the radial, vertical, and azimuthal variations metals in stars, both today at formation, FIRE-2 cosmological simulations Milky Way (MW)-mass galaxies, we compare with MW. The radial gradient is steeper (more negative) for younger which agrees MW, although gradients are shallower FIRE-2. Importantly, this age dependence was present already birth: only modestly ($\lesssim$...
Observations of the Milky Way's low-$α$ disk show that at fixed metallicity, [Fe/H], several element abundance, [X/Fe], correlate with age, unique slopes and small scatters around age-[X/Fe] relations. In this study, we turn to simulations explore relations for elements C, N, O, Mg, Si, S, Ca are traced in a FIRE-2 cosmological zoom-in simulation Way-like galaxy, m12i, understand what physical conditions give rise observed trends. We first distributions mono-age populations their birth...