Outputs (26)

Hydrodynamic simulations of the Disc of Gas Around Supermassive black holes (HDGAS) -II; The transition from neutral atomic to molecular gas phases (2025)
Journal Article
Raouf, M., Viti, S., Karimi, R., & Richings, A. J. (2025). Hydrodynamic simulations of the Disc of Gas Around Supermassive black holes (HDGAS) -II; The transition from neutral atomic to molecular gas phases. Monthly notices of the Royal Astronomical Society, 539(2), 1516-1527. https://doi.org/10.1093/mnras/staf557

We use HDGAS hydrodynamic simulations to study the impact of active galactic nucleus (AGN) feedback on the conversion of atomic-gas to molecular-gas within the circumnuclear-disc (CND) of a typical AGN-dominated galaxy. The comparison of CI, CII, and... Read More about Hydrodynamic simulations of the Disc of Gas Around Supermassive black holes (HDGAS) -II; The transition from neutral atomic to molecular gas phases.

Tests of subgrid models for star formation using simulations of isolated disc galaxies (2024)
Journal Article
Nobels, F. S. J., Schaye, J., Schaller, M., Ploeckinger, S., Chaikin, E., & Richings, A. J. (2024). Tests of subgrid models for star formation using simulations of isolated disc galaxies. Monthly notices of the Royal Astronomical Society, 532(3), 3299-3321. https://doi.org/10.1093/mnras/stae1390

We use smoothed particle hydrodynamics simulations of isolated Milky Way-mass disc galaxies that include cold, interstellar gas to test subgrid prescriptions for star formation (SF). Our fiducial model combines a Schmidt law with a gravitational inst... Read More about Tests of subgrid models for star formation using simulations of isolated disc galaxies.

Predictions for CO emission and the CO-to-H2 conversion factor in galaxy simulations with non-equilibrium chemistry (2024)
Journal Article
Thompson, O. A., Richings, A. J., Gibson, B. K., Faucher-Giguère, C. A., Feldmann, R., & Hayward, C. C. (2024). Predictions for CO emission and the CO-to-H2 conversion factor in galaxy simulations with non-equilibrium chemistry. Monthly notices of the Royal Astronomical Society, 532(2), 1948-1965. https://doi.org/10.1093/mnras/stae1486

Our ability to trace the star-forming molecular gas is important to our understanding of the Universe. We can trace this gas using CO emission, converting the observed CO intensity into the H2 gas mass of the region using the CO-to-H2 conversion fact... Read More about Predictions for CO emission and the CO-to-H2 conversion factor in galaxy simulations with non-equilibrium chemistry.

Dense stellar clump formation driven by strong quasar winds in the FIRE cosmological hydrodynamic simulations (2024)
Journal Article
Mercedes-Feliz, J., Anglés-Alcázar, D., Oh, B. K., Hayward, C. C., Cochrane, R. K., Richings, A. J., Faucher-Giguère, C. A., Wellons, S., Terrazas, B. A., Moreno, J., Su, K. Y., & Hopkins, P. F. (2024). Dense stellar clump formation driven by strong quasar winds in the FIRE cosmological hydrodynamic simulations. Monthly notices of the Royal Astronomical Society, 530(3), 2795-2809. https://doi.org/10.1093/mnras/stae1021

We investigate the formation of dense stellar clumps in a suite of high-resolution cosmological zoom-in simulations of a massive, star-forming galaxy at z ∼ 2 under the presence of strong quasar winds. Our simulations include multiphase ISM physics f... Read More about Dense stellar clump formation driven by strong quasar winds in the FIRE cosmological hydrodynamic simulations.

The interplay between dust and radiation (2024)
Book Chapter
Richings, A. (2024). The interplay between dust and radiation. In S. Bovino, & T. Grassi (Eds.), Astrochemical Modeling: Practical Aspects of Microphysics in Numerical Simulations (157-188). Elsevier. https://doi.org/10.1016/B978-0-32-391746-9.00015-8

The attenuation of radiation due to dust depends on the composition and optical properties of the dust grains. This is fundamental to determine the impact of radiation on chemical evolution. In this chapter, we discuss how we can compute grain proper... Read More about The interplay between dust and radiation.

Constraining the driving mechanism of galaxy-scale winds with emission line spectra (2023)
Presentation / Conference Contribution
Stern, J., Oñorbe, J., Richings, A. J., Johnson, S. D., & Faucher-Giguère, C.-A. (2023, March). Constraining the driving mechanism of galaxy-scale winds with emission line spectra. Presented at Black Hole Winds at All Scales : IAU symposium 378, Haifa, Israel

Using hydrodynamic simulations and photoionization calculations, we demonstrate that quasar emission line spectra contain information on the driving mechanism of galaxy-scale outflows. Outflows driven by a hot shocked bubble are expected to exhibit L... Read More about Constraining the driving mechanism of galaxy-scale winds with emission line spectra.

Hydrodynamic simulations of the disc of gas around supermassive black holes (HDGAS) -I. Molecular gas dynamics (2023)
Journal Article
Raouf, M., Viti, S., García-Burillo, S., Richings, A. J., Schaye, J., Bemis, A., Nobels, F. S., Guainazzi, M., Huang, K. Y., Schaller, M., Impellizzeri, V., & Holdship, J. (2023). Hydrodynamic simulations of the disc of gas around supermassive black holes (HDGAS) -I. Molecular gas dynamics. Monthly notices of the Royal Astronomical Society, 524(1), 786-800. https://doi.org/10.1093/mnras/stad1957

We present hydrodynamic simulations of the interstellar medium (ISM) within the circumnuclear disc (CND) of a typical active galactic nucleus (AGN)-dominated galaxy influenced by mechanical feedback from an AGN. The simulations are coupled with the C... Read More about Hydrodynamic simulations of the disc of gas around supermassive black holes (HDGAS) -I. Molecular gas dynamics.

Rapid disc settling and the transition from bursty to steady star formation in Milky Way-mass galaxies (2022)
Journal Article
Gurvich, A. B., Stern, J., Faucher-Giguère, C. A., Hopkins, P. F., Wetzel, A., Moreno, J., Hayward, C. C., Richings, A. J., & Hafen, Z. (2023). Rapid disc settling and the transition from bursty to steady star formation in Milky Way-mass galaxies. Monthly notices of the Royal Astronomical Society, 519(2), 2598-2614. https://doi.org/10.1093/mnras/stac3712

Recent observations and simulations indicate substantial evolution in the properties of galaxies with time, wherein rotationally supported and steady thin discs (like those frequently observed in the local Universe) emerge from galaxies that are clum... Read More about Rapid disc settling and the transition from bursty to steady star formation in Milky Way-mass galaxies.

The effects of local stellar radiation and dust depletion on non-equilibrium interstellar chemistry (2022)
Journal Article
Richings, A. J., Faucher-Giguère, C. A., Gurvich, A. B., Schaye, J., & Hayward, C. C. (2022). The effects of local stellar radiation and dust depletion on non-equilibrium interstellar chemistry. Monthly notices of the Royal Astronomical Society, 517(2), 1557-1583. https://doi.org/10.1093/mnras/stac2338

Interstellar chemistry is important for galaxy formation, as it determines the rate at which gas can cool, and enables us to make predictions for observable spectroscopic lines from ions and molecules. We explore two central aspects of modelling the... Read More about The effects of local stellar radiation and dust depletion on non-equilibrium interstellar chemistry.

Unravelling the physics of multiphase AGN winds through emission line tracers (2021)
Journal Article
Richings, A. J., Faucher-Giguère, C. A., & Stern, J. (2021). Unravelling the physics of multiphase AGN winds through emission line tracers. Monthly notices of the Royal Astronomical Society, 503(2), 1568-1585. https://doi.org/10.1093/mnras/stab556

Observations of emission lines in active galactic nuclei (AGNs) often find fast (∼1000 km s−1) outflows extending to kiloparsec scales, seen in ionized, neutral atomic and molecular gas. In this work we present radiative transfer calculations of emis... Read More about Unravelling the physics of multiphase AGN winds through emission line tracers.