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We investigate the driving mechanisms for the HI gas content in star-forming central galaxies at low redshift, by examining the HI-to-stelalr mass ratio ($M_{\rm HI}/M_\ast$) in both the state-of-the-art hydrodynamic simulations,…

Astrophysics of Galaxies · Physics 2024-11-13 Xiao Li , Cheng Li , Houjun Mo

We use a combination of data from the MaNGA survey and MaNGA-like observations in IllustrisTNG100 to determine the prevalence of misalignment between the rotational axes of stars and gas. This census paper outlines the typical…

Astrophysics of Galaxies · Physics 2020-01-08 Christopher Duckworth , Rita Tojeiro , Katarina Kraljic

We present a retuning of the IllustrisTNG baryonic physics model which can be used to run large-box realistic cosmological simulations with a lower resolution. This new model employs a lowered gas density threshold for star formation and…

Cosmology and Nongalactic Astrophysics · Physics 2022-10-28 Myles A. Mitchell , Christian Arnold , Baojiu Li

The dominant processes by which galaxies replenish their cold gas reservoirs remain disputed, especially in massive galaxies. Stellar-gas kinematic misalignments offer an opportunity to study these replenishment processes. However, observed…

Astrophysics of Galaxies · Physics 2025-10-17 Maximilian K. Baker , Timothy A. Davis , Freeke van de Voort , Ilaria Ruffa

In cosmological simulations without baryons, the relation between the specific angular momentum $j_{\rm h}$ and mass $M_{\rm h}$ of galactic dark matter halos has the well-established form $j_{\rm h} \propto M_{\rm h}^{2/3}$. This is…

Astrophysics of Galaxies · Physics 2023-05-25 S. Michael Fall , Vicente Rodriguez-Gomez

We investigate the co-evolution of the angular momentum of Milky Way-like galaxies, their circumgalactic gas, and their dark matter halos using zoom-in simulations from the Figuring Out Gas & Galaxies in Enzo (FOGGIE) suite. We examine how…

Context. The concomitant observation of gravitational wave and electromagnetic signals from a binary neutron star (BNS) merger in 2017 confirmed that these events can produce relativistic jets responsible for short Gamma-Ray Bursts (sGRBs).…

High Energy Astrophysical Phenomena · Physics 2025-02-19 Emma Dreas , Andrea Pavan , Riccardo Ciolfi , Annalisa Celotti

In this work we introduce a physically motivated method of performing disc/spheroid decomposition of simulated galaxies, which we apply to the Eagle sample. We make use of the HEALPix package to create Mollweide projections of the angular…

Astrophysics of Galaxies · Physics 2021-01-14 Dimitrios Irodotou , Peter A. Thomas

We show that the mass fraction f_atm = 1.35*MHI/M of neutral atomic gas (HI and He) in isolated local disk galaxies of baryonic mass M is well described by a straightforward stability model for flat exponential disks. In the outer disk…

Astrophysics of Galaxies · Physics 2016-06-22 Danail Obreschkow , Karl Glazebrook , Virginia Kilborn , Katharina Lutz

(Abridged) We report results of a series of non radiative N-body/SPH simulations in a LCDM cosmology. We find that the spin of the baryonic component is on average larger than that of the dark matter (DM) component and we find this effect…

Astrophysics · Physics 2009-11-10 Sanjib Sharma , Matthias Steinmetz

Recent theoretical studies have shown that galaxies at high redshift are fed by cold, dense gas filaments, suggesting angular momentum transport by gas differs from that by dark matter. Revisiting this issue using high-resolution…

Cosmology and Nongalactic Astrophysics · Physics 2011-06-06 Taysun Kimm , Julien Devriendt , Adrianne Slyz , Christophe Pichon , Susan A. Kassin , Yohan Dubois

We study the connection between active galactic nuclei (AGN) and their host galaxies through cosmic time in the large-scale cosmological IllustrisTNG simulations. We first compare BH properties, i.e. the hard X-ray BH luminosity function,…

We study the origin of the wide distribution of angles between the angular momenta of the stellar and gas components, $\alpha_{\rm G,S}$, in early-type galaxies (ETGs). We use the GALFORM model of galaxy formation, set in the $\Lambda$ cold…

Astrophysics of Galaxies · Physics 2015-06-23 Claudia del P. Lagos , N. D. Padilla , T. A. Davis , C. G. Lacey , C. M. Baugh , V. Gonzalez-Perez , M. Zwaan , S. Contreras

The angular momentum properties of virialised dark matter haloes have been measured with good statistics in collisionless N-body simulations, but an equally accurate analysis of the baryonic spin is still missing. We employ the Illustris…

Cosmology and Nongalactic Astrophysics · Physics 2017-01-18 Jolanta Zjupa , Volker Springel

This is the second paper of our series of works of studying the effects of active galactic nuclei (AGN) feedback on the cosmological evolution of an isolated elliptical galaxy by performing two-dimensional high-resolution hydrodynamical…

High Energy Astrophysical Phenomena · Physics 2018-09-05 Doosoo Yoon , Feng Yuan , Zhao-Ming Gan , Jeremiah P. Ostriker , Ya-Ping Li , Luca Ciotti

We analyse the sizes and specific angular momentum content of galaxies in the Colibre cosmological hydrodynamical simulations spanning two orders of magnitude in mass resolution. We compare the predicted size-mass and angular momentum-mass…

The central dark-matter fraction of galaxies is sensitive to feedback processes during galaxy formation. Strong gravitational lensing has been effective in the precise measurement of the dark-matter fraction inside massive early-type…

Cosmology and Nongalactic Astrophysics · Physics 2021-11-15 Sampath Mukherjee , Léon V. E. Koopmans , Crescenzo Tortora , Matthieu Schaller , R. Benton Metcalf , Joop Schaye , Georgios Vernardos

Mass and angular momentum are key parameters of galaxies. Their co-evolution establishes an empirical relation between the specific stellar angular momentum j* and the stellar mass M* that depends on morphology. In this work, we measure j*…

Astrophysics of Galaxies · Physics 2023-06-14 C. Pulsoni , O. Gerhard , S. M. Fall , M. Arnaboldi , A. I. Ennis , J. Hartke , L. Coccato , N. R. Napolitano

We use EAGLE to quantify the effect galaxy mergers have on the stellar specific angular momentum of galaxies, $j_{\rm stars}$. We split mergers into: dry (gas-poor)/wet (gas-rich), major/minor, and different spin alignments and orbital…

The baryonic physics shaping galaxy formation and evolution are complex, spanning a vast range of scales and making them challenging to model. Cosmological simulations rely on subgrid models that produce significantly different predictions.…