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In this paper we use state-of-the-art N-body hydrodynamic simulations of a cosmological volume of side 100Mpc to produce many galaxy clusters simultaneously in both the standard cold dark matter (SCDM) cosmology and a cosmology with a…

Astrophysics · Physics 2007-05-23 F. R. Pearce , H. M. P. Couchman , P. A. Thomas , A. C. Edge

We present a science case for the Habitable Worlds Observatory (HWO) to map the circumgalactic medium (CGM) in emission by targeting ultraviolet emission lines, which trace the 10^4 - 10^6 K gas engaged in the feedback and accretion…

We use hydrodynamical simulations of two Milky Way-mass galaxies to demonstrate the impact of cosmic-ray pressure on the kinematics of cool and warm circumgalactic gas. Consistent with previous studies, we find that cosmic-ray pressure can…

Flux limited X-ray surveys of galaxy clusters show that clusters come in two roughly equally proportioned varieties: "cool core" clusters (CCs) and non-"cool core" clusters (NCCs). In previous work, we have demonstrated using cosmological…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-12 Stephen Skory , Eric Hallman , Jack O. Burns , Samuel W. Skillman , Brian W. O'Shea , Britton D. Smith

Self-consistently modeling baryonic effects in survey-scale cosmological simulations has become increasingly important as the diversity, precision, and statistical reach of modern observations continue to improve. The advent of exascale…

We present an analysis of the angular momentum content of the circumgalactic medium (CGM) using TNG100, one of the flagship runs of the IllustrisTNG project. We focus on Milky Way-mass halos ($\sim 10^{12} \; M_{\odot}$) at $z=0$ but also…

Astrophysics of Galaxies · Physics 2020-05-22 Daniel DeFelippis , Shy Genel , Greg L. Bryan , Dylan Nelson , Annalisa Pillepich , Lars Hernquist

We present a study exploring the impact of a starburst on the properties of the surrounding circum-galactic medium (CGM): gas located beyond the galaxy's stellar body and extending out to the virial radius (200 kpc). We obtained ultraviolet…

Cosmology and Nongalactic Astrophysics · Physics 2014-09-16 Sanchayeeta Borthakur , Timothy Heckman , David Strickland , Vivienne Wild , David Schiminovich

We use cosmological gas dynamic simulations to investigate the accuracy of galaxy cluster mass estimates based on X-ray observations. The experiments follow the formation of clusters in different cosmological models and include the effects…

Astrophysics · Physics 2009-10-28 August E. Evrard , Christopher A. Metzler , Julio F. Navarro

We study the properties of the circumgalactic medium (CGM) of high-$z$ galaxies in the metal enrichment simulations presented in Pallottini et al. 2014. At $z=4$, we find that the simulated CGM gas density profiles are self-similar, once…

Astrophysics of Galaxies · Physics 2015-06-22 Andrea Pallottini , Simona Gallerani , Andrea Ferrara

We explore the circumgalactic medium (CGM) of two simulated star-forming galaxies with luminosities L ~ 0.1 and 1 L* generated using the smooth particle hydrodynamic code GASOLINE. These simulations are part of the Making Galaxies In a…

We study gas mixing in a simulated Milky Way-mass galaxy's circumgalactic medium (CGM) using cosmological `zoom-in' simulations. We insert tracer dyes in the CGM with different gas flows (shearing, coherent, and static) and diverse physical…

Astrophysics of Galaxies · Physics 2025-07-01 Hilay Shah , Freeke van de Voort , Amit Seta , Christoph Federrath

We analyse the properties of circumgalactic gas around simulated galaxies in the redshift range z >= 3, utilising a new sample of cosmological zoom simulations. These simulations are intended to be representative of the observed samples of…

Astrophysics of Galaxies · Physics 2017-12-27 Peter Mitchell , Jeremy Blaizot , Julien Devriendt , Taysun Kimm , Leo Michel-Dansac , Joakim Rosdahl , Adrianne Slyz

The impact of AGN feedback on the hot gas content of galaxy groups remains a key uncertainty in galaxy formation and its connection to the large scale structure of the Universe. We aim to compare the XMM-Newton Group AGN Project (X-GAP)…

We exmaine the distribution of hot gas in a standard CDM model of the universe using high resolution hydrodynamic simulations. Adopting standard parameters determined from COBE and light element nucleosynthesis, $\sigma_8=1.05$,…

Astrophysics · Physics 2009-10-22 Hyesung Kang , Renyue Cen , Jeremiah P. Ostriker , Dongsu Ryu

We present predictions for the galaxy-galaxy lensing profile from the EAGLE hydrodynamical cosmological simulation at redshift z=0.18, in the spatial range 0.02 < R/(Mpc/h) < 2, and for five logarithmically equi-spaced stellar mass bins in…

The baryon fraction of galaxy clusters is a powerful tool to inform on the cosmological parameters while the hot-gas fraction provides indications on the physics of the intracluster plasma and its interplay with the processes driving galaxy…

We use the GIBLE suite of cosmological zoom-in simulations of Milky Way-like galaxies with additional super-Lagrangian refinement in the circumgalactic medium (CGM) to quantify the origin and evolution of CGM cold gas clouds. The origin of…

Astrophysics of Galaxies · Physics 2025-06-25 Rahul Ramesh , Dylan Nelson , Drummond Fielding , Marcus Brüggen

The circumgalactic medium (CGM) is often assumed to exist in or near hydrostatic equilibrium with the regulation of accretion and the effects of feedback treated as perturbations to a stable balance between gravity and thermal pressure. We…

The circumgalactic medium (CGM) plays a crucial role in regulating material and energy exchange between galaxies and their environments. The best means of observing this medium is through absorption-line spectroscopy, but we have yet to…

Astrophysics of Galaxies · Physics 2025-06-24 Yue Hu , Evan Scannapieco , Edward Buie , Siyao Xu , Samuel T Sebastian , Om Biswal

We analyze the intracluster medium (ICM) and circumgalactic medium (CGM) in 7 X-ray detected galaxy clusters using spectra of background QSOs (HST-COS/STIS), optical spectroscopy of the cluster galaxies (MMT/Hectospec and SDSS), and X-ray…