Outputs (26)

The changing circumgalactic medium over the last 10 Gyr-I. Physical and dynamical properties (2020)
Journal Article
Huscher, E., Oppenheimer, B. D., Lonardi, A., Crain, R. A., Richings, A. J., & Schaye, J. (2021). The changing circumgalactic medium over the last 10 Gyr-I. Physical and dynamical properties. Monthly notices of the Royal Astronomical Society, 500(1), 1476-1490. https://doi.org/10.1093/mnras/staa3203

We present an analysis of the physical and dynamical states of two sets of EAGLE zoom simulations of galaxy haloes, one at high redshift (z = 2-3) and the other at low redshift (z = 0), with masses of ≈10^12 M. Our focus is how the circumgalactic med... Read More about The changing circumgalactic medium over the last 10 Gyr-I. Physical and dynamical properties.

Reproducing the CO-to-H2 conversion factor in cosmological simulations of Milky-Way-mass galaxies (2020)
Journal Article
Keating, L. C., Richings, A. J., Murray, N., Faucher-Giguère, C. A., Hopkins, P. F., Wetzel, A., Kereš, D., Benincasa, S., Feldmann, R., Loebman, S., & Orr, M. E. (2020). Reproducing the CO-to-H2 conversion factor in cosmological simulations of Milky-Way-mass galaxies. Monthly notices of the Royal Astronomical Society, 499(1), 837-850. https://doi.org/10.1093/mnras/staa2839

We present models of CO(1-0) emission from Milky-Way-mass galaxies at redshift zero in the FIRE-2 cosmological zoom-in simulations. We calculate the molecular abundances by post-processing the simulations with an equilibrium chemistry solver while ac... Read More about Reproducing the CO-to-H2 conversion factor in cosmological simulations of Milky-Way-mass galaxies.

Pressure balance in the multiphase ISM of cosmologically simulated disc galaxies (2020)
Journal Article
Gurvich, A. B., Faucher-Giguère, C. A., Richings, A. J., Hopkins, P. F., Grudić, M. Y., Hafen, Z., Wellons, S., Stern, J., Quataert, E., Chan, T. K., Orr, M. E., Kereš, D., Wetzel, A., Hayward, C. C., Loebman, S. R., & Murray, N. (2020). Pressure balance in the multiphase ISM of cosmologically simulated disc galaxies. Monthly notices of the Royal Astronomical Society, 498(3), 3664-3683. https://doi.org/10.1093/mnras/staa2578

Pressure balance plays a central role in models of the interstellar medium (ISM), but whether and how pressure balance is realized in a realistic multiphase ISM is not yet well understood. We address this question by using a set of FIRE-2 cosmologica... Read More about Pressure balance in the multiphase ISM of cosmologically simulated disc galaxies.

The multiphase circumgalactic medium traced by low metal ions in EAGLE zoom simulations (2018)
Journal Article
Oppenheimer, B. D., Schaye, J., Crain, R. A., Werk, J. K., & Richings, A. J. (2018). The multiphase circumgalactic medium traced by low metal ions in EAGLE zoom simulations. Monthly notices of the Royal Astronomical Society, 481(1), 835-859. https://doi.org/10.1093/mnras/sty2281

We explore the circumgalactic metal content traced by commonly observed low ion absorbers, including C II, SiII, SiIII, SiIV, and MgII. We use a set of cosmological hydrodynamical zoom simulations run with the EAGLE model and including a non-equilibr... Read More about The multiphase circumgalactic medium traced by low metal ions in EAGLE zoom simulations.

Radiative cooling of swept-up gas in AGN-driven galactic winds and its implications for molecular outflows (2018)
Journal Article
Richings, A. J., & Faucher-Giguère, C. A. (2018). Radiative cooling of swept-up gas in AGN-driven galactic winds and its implications for molecular outflows. Monthly notices of the Royal Astronomical Society, 478(3), 3100-3119. https://doi.org/10.1093/MNRAS/STY1285

We recently used hydrochemical simulations to demonstrate that molecular outflows observed in luminous quasars can be explained by molecule formation within the active galactic nucleus (AGN) wind. However, these simulations cover a limited parameter... Read More about Radiative cooling of swept-up gas in AGN-driven galactic winds and its implications for molecular outflows.

The origin of fast molecular outflows in quasars: Molecule formation in AGN-driven galactic winds (2017)
Journal Article
Richings, A. J., & Faucher-Giguère, C. A. (2018). The origin of fast molecular outflows in quasars: Molecule formation in AGN-driven galactic winds. Monthly notices of the Royal Astronomical Society, 474(3), 3673-3699. https://doi.org/10.1093/mnras/stx3014

We explore the origin of fast molecular outflows that have been observed in active galactic nuclei (AGNs). Previous numerical studies have shown that it is difficult to create such an outflow by accelerating existing molecular clouds in the host gala... Read More about The origin of fast molecular outflows in quasars: Molecule formation in AGN-driven galactic winds.

Flickering AGN can explain the strong circumgalactic OVI observed by COS-Halos (2017)
Journal Article
Oppenheimer, B. D., Segers, M., Schaye, J., Richings, A. J., & Crain, R. A. (2018). Flickering AGN can explain the strong circumgalactic OVI observed by COS-Halos. Monthly notices of the Royal Astronomical Society, 474(4), 4740-4755. https://doi.org/10.1093/mnras/stx2967

Proximity zone fossils (PZFs) are ionization signatures around recently active galactic nuclei (AGNs) where metal species in the circumgalactic medium remain overionized after the AGNs have shut offdue to their long recombination time scales. We expl... Read More about Flickering AGN can explain the strong circumgalactic OVI observed by COS-Halos.

Metals in the circumgalactic medium are out of ionization equilibrium due to fluctuating active galactic nuclei (2017)
Journal Article
Segers, M. C., Oppenheimer, B. D., Schaye, J., & Richings, A. J. (2017). Metals in the circumgalactic medium are out of ionization equilibrium due to fluctuating active galactic nuclei. Monthly notices of the Royal Astronomical Society, 471(1), 1026-1044. https://doi.org/10.1093/MNRAS/STX1633

We study the effect of a fluctuating active galactic nucleus (AGN) on the abundance of circumgalactic OVI in galaxies selected from the Evolution and Assembly of GaLaxies and their Environments simulations. We follow the time-variable OVI abundance i... Read More about Metals in the circumgalactic medium are out of ionization equilibrium due to fluctuating active galactic nuclei.

Chemical evolution of giant molecular clouds in simulations of galaxies (2016)
Journal Article
Richings, A. J., & Schaye, J. (2016). Chemical evolution of giant molecular clouds in simulations of galaxies. Monthly notices of the Royal Astronomical Society, 460(3), 2297-2321. https://doi.org/10.1093/mnras/stw1135

We present an analysis of giant molecular clouds (GMCs) within hydrodynamic simulations of isolated, low-mass (M* ~ 10^9 M⊙) disc galaxies. We study the evolution of molecular abundances and the implications for CO emission and the XCO conversion fac... Read More about Chemical evolution of giant molecular clouds in simulations of galaxies.

Bimodality of low-redshift circumgalactic O VI in non-equilibrium EAGLE zoom simulations (2016)
Journal Article
Oppenheimer, B. D., Crain, R. A., Schaye, J., Rahmati, A., Richings, A. J., Trayford, J. W., Tumlinson, J., Bower, R. G., Schaller, M., & Theuns, T. (2016). Bimodality of low-redshift circumgalactic O VI in non-equilibrium EAGLE zoom simulations. Monthly notices of the Royal Astronomical Society, 460(2), 2157-2179. https://doi.org/10.1093/mnras/stw1066

We introduce a series of 20 cosmological hydrodynamical simulations of L* (M200 = 10^11.7-10^12.3M⊙) and group-sized (M200 = 10^12.7-10^13.3M⊙) haloes run with the model used for the eagle project, which additionally includes a non-equilibrium ioniza... Read More about Bimodality of low-redshift circumgalactic O VI in non-equilibrium EAGLE zoom simulations.