A5022858128- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Radio Astronomy Observations and Technology
- Computational Physics and Python Applications
- Data Visualization and Analytics
- Solar and Space Plasma Dynamics
University of Oxford
2021-2024
Royal Observatory
2019
ABSTRACT We use the simba cosmological galaxy formation simulation to investigate relationship between major mergers ($\lesssim$4:1), starbursts, and quenching. Mergers are identified via sudden jumps in stellar mass M* well above that expected from situ star formation, while quenching is defined as going specific rate (sSFR) $\gt t_{\rm H}^{-1}$ $\lt 0.2t_{\rm H}^{-1}$, where tH Hubble time. At z ≈ 0–3, show ∼2–3× higher SFR than a mass-matched sample of star-forming galaxies, but globally...
Dust in galaxies is an important tracer of galaxy properties and their evolution over time. The physical origin the grain size distribution, dust chemical composition, and, hence, associated ultraviolet-to-optical extinctions diverse remains elusive. To address this issue, we introduce a model for RAMSES code simulations with resolved multiphase interstellar medium. modelled as fluid transported gas component, decomposed into two sizes, 5 nm 0.1 μm, compositions carbonaceous silicate grains....
ABSTRACT During the last decade, cosmological simulations have managed to reproduce realistic and morphologically diverse galaxies, spanning Hubble sequence. Central this success was a phenomenological calibration of few included feedback processes, while glossing over higher complexity baryonic physics. This approach diminishes predictive power such simulations, preventing further our understanding galaxy formation. To tackle fundamental issue, we investigate impact cosmic rays (CRs)...
Abstract The structure of magnetic fields in galaxies remains poorly constrained, despite the importance magnetism evolution galaxies. Radio synchrotron and far-infrared (FIR) polarization polarimetric observations are best methods to measure galactic scale properties beyond Milky Way. We use synthetic a simulated galaxy identify quantify regions, scales, interstellar medium (ISM) phases probed at FIR radio wavelengths. Our studied suite magnetohydrodynamical cosmological zoom-in simulations...
ABSTRACT Galaxies with little star formation are found to have quenched over a variety of time-scales, which provides insights into the physical mechanisms responsible. Here, we examine population rapidly galaxies (RQGs) in Simba cosmological hydrodynamic simulation at 0.5 < z 2, and compare them directly observed post-starburst UKIDSS Ultra Deep Survey (UDS) via their colour distributions mass functions. We find that fraction quiescent = 1 is 59 ± 3 per cent, contributing 48 5 cent...
The cataclysmic explosions of massive stars as supernovae are one the key ingredients galaxy formation. However, their evolution is not well understood in presence magnetic fields or cosmic rays (CRs). We study expansion individual supernova remnants (SNRs) using our suite 3D hydrodynamical (HD), magnetohydrodynamical (MHD) and CRMHD simulations generated RAMSES. explore multiple ambient densities, fractions energy deposited CRs ($\chi_{\rm CR}$), accounting for ray anisotropic diffusion...
During the last decade, cosmological simulations have managed to reproduce realistic and morphologically diverse galaxies, spanning Hubble sequence. Central this success was a phenomenological calibration of few included feedback processes, whilst glossing over higher complexity baryonic physics. This approach diminishes predictive power such simulations, preventing further our understanding galaxy formation. To tackle fundamental issue, we investigate impact cosmic rays (CRs) magnetic...
The structure of magnetic fields in galaxies remains poorly constrained, despite the importance magnetism evolution galaxies. Radio synchrotron and far-infrared (FIR) polarization polarimetric observations are best methods to measure galactic scale properties beyond Milky Way. We use synthetic a simulated galaxy identify quantify regions, scales, interstellar medium (ISM) phases probed at FIR radio wavelengths. Our studied suite magnetohydrodynamical cosmological zoom-in simulations features...
We introduce a model for dust evolution in the RAMSES code simulations of galaxies with resolved multiphase interstellar medium. Dust is modelled as fluid transported gas component, and decomposed into two sizes, 5 nm 0.1 $\mu\rm m$, chemical compositions carbonaceous silicate grains. Using suite isolated disc different masses metallicities, can explore role these processes shaping key properties galaxies. The simulated Milky Way analogue reproduces dust-to-metal mass ratio (DTM), depletion...