Browsing Research Articles (Physics) by Author "Davé, Romeel"
Now showing items 1-13 of 13
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Boundless baryons: how diffuse gas contributes to anisotropic tSZ signal around simulated three hundred clusters
Davé, Romeel; Lokken, Martine; Cui, Weiguang (Oxford University Press, 2023)Upcoming advances in galaxy surveys and cosmic microwave background data will enable measurements of the anisotropic distribution of diffuse gas in filaments and superclusters at redshift z = 1 and beyond, observed through ... -
Breaking baryon-cosmology degeneracy with the electron density power spectrum
Nicola, Andrina; Villaescusa-Navarro, Francisco; Davé, Romeel (IOP Publishing, 2022)Uncertain feedback processes in galaxies affect the distribution of matter, currently limiting the power of weak lensing surveys. If we can identify cosmological statistics that are robust against these uncertainties, or ... -
Ceers key paper. I. An early look into the first 500myr of galaxy formation with jwst
Finkelstein, Steven L.; Bagley, Micaela B.; Davé, Romeel (American Astronomical Society, 2023)We present an investigation into the first 500 Myr of galaxy evolution from the Cosmic Evolution Early Release Science (CEERS) survey. CEERS, one of 13 JWST ERS programs, targets galaxy formation from z ∼ 0.5 to >10 using ... -
Cosmic sands: the origin of dusty, star-forming galaxies in the epoch of reionization
Davé, Romeel; Lower, Sidney; Narayanan, Desika (The astrophysical journal, 2023)We present the Cosmic Sands suite of cosmological zoom-in simulations based on the simba galaxy formation model in order to study the buildup of the first massive and dusty galaxies in the early universe. Residing in the ... -
The diversity and variability of star formation histories in models of galaxy evolution
Davé, Romeel; Iyer, Kartheik; Tacchella, Sandro (2020-07-25)Understanding the variability of galaxy star formation histories (SFHs) across a range of time-scales provides insight into the underlying physical processes that regulate star formation within galaxies. We compile the ... -
Efficient long-range active galactic nuclei (agns) feedback affects the low-redshift lyα forest
Tillman, Megan Taylor; Burkhart, Blakesley; Davé, Romeel (American Astronomical Society, 2023)Active galactic nuclei (AGNs) feedback models are generally calibrated to reproduce galaxy observables such as the stellar mass function and the bimodality in galaxy colors. We use variations of the AGN feedback implementations ... -
Finding universal relations in Subhalo properties with artificial intelligence
Davé, Romeel (The Astrophysical Journal, 2022)We use a generic formalism designed to search for relations in high-dimensional spaces to determine if the total mass of a subhalo can be predicted from other internal properties such as velocity dispersion, radius, or ... -
Galaxy cold gas contents in modern cosmological hydrodynamic simulations
Davé, Romeel; Crain, Robert; Stevens, Adam (Oxford University Press, 2020-07-03)We present a comparison of galaxy atomic and molecular gas properties in three recent cosmological hydrodynamic simulations, namely SIMBA, EAGLE, and IllustrisTNG, versus observations from z ∼ 0 to 2. These simulations ... -
Imprints of temperature fluctuations on the z ∼ 5 Lyman-α forest: a view from radiation-hydrodynamic simulations of reionization
Davé, Romeel (Oxford academic, 2019)Reionization leads to large spatial fluctuations in the intergalactic temperature that can persist well after its completion. We study the imprints of such fluctuations on the z ∼ 5 Ly α forest flux power spectrum using ... -
The origin and evolution of Lyα blobs in cosmological galaxy formation simulations
Davé, Romeel; Kimock, B; Narayanan, D (IOP Publishing Ltd, 2021)High-redshift Lyα blobs (LABs) are an enigmatic class of objects that have been the subject of numerous observational and theoretical investigations. It is of particular interest to determine the dominant power sources for ... -
The origin of the dust extinction curve in milky way-like galaxies
Davé, Romeel; Vogelsberger, M.; Li, Q; Torrey, P.; Narayanan, D. (Oxford University Press, 2021)We develop a cosmological model for the evolution of dust grains in galaxies with a distribution of sizes in order to understand the origin of the Milky Way dust extinction curve. Our model considers the formation of active ... -
The vandels survey: The star-formation histories of massive quiescent galaxies at 1.0 < z < 1.3
Davé, Romeel; Carnall, A. C.; McLure, R. J. (Oxford Academics, 2019)We present a Bayesian full-spectral-fitting analysis of 75 massive (M∗>1010.3M⊙) UVJ-selected galaxies at redshifts of 1.0 < z < 1.3, combining extremely deep rest-frame ultraviolet spectroscopy from VANDELS with ... -
X-ray emission from hot gas in galaxy groups and clusters in SIMBA
Davé, Romeel; Robson, Dylan (Oxford University Press, 2020-08-31)We examine X-ray scaling relations for massive haloes (M500 > 1012.3 M) in the SIMBA galaxy formation simulation. The X-ray luminosity, LX versus M500 has power-law slopes ≈5 3 and ≈8 3 above and below 1013.5 M, deviating ...