We introduce a series of 20 cosmological hydrodynamical simulations Lstar (M_200 =10^11.7 - 10^12.3 Msol) and group-sized = 10^12.7 10^13.3 haloes run with the model used for EAGLE project, which additionally includes non-equilibrium ionization cooling module that follows 136 ions. The reproduce observed correlation, revealed by COS-Halos at z~0.2, between O VI column density impact parameters b < 150 kpc specific star formation rate (sSFR=SFR/Mstar) central galaxy z~0.2. find circumgalactic...

We explore the origin of fast molecular outflows that have been observed in Active Galactic Nuclei (AGN). Previous numerical studies shown it is difficult to create such an outflow by accelerating existing clouds host galaxy, as will be destroyed before they can reach high velocities are observed. In this work, we consider alternative scenario where molecules form in-situ within AGN outflow. present a series hydro-chemical simulations isotropic wind interacting with uniform medium. follow...

Recent observations and simulations indicate substantial evolution in the properties of galaxies with time, wherein rotationally-supported steady thin discs (like those frequently observed local universe) emerge from that are clumpy, irregular, have bursty star formation rates (SFRs). To better understand progenitors disc we carry out an analysis three FIRE-2 simulated a mass similar to Milky Way at redshift z=0. We show all transition SFRs between z=0.5 z=0.8, this coincides rapid (< ~1...

Proximity zone fossils (PZFs) are ionization signatures around recently active galactic nuclei (AGN) where metal species in the circumgalactic medium remain over-ionized after AGN has shut-off due to their long recombination timescales. We explore cosmological zoom hydrodynamic simulations using EAGLE model paired with a non-equilibrium and cooling module including time-variable radiation PZFs star-forming, disk galaxies z~0.2 Universe. Previous typically under-estimated O VI content of...

We explore the circumgalactic metal content traced by commonly observed low ion absorbers, including C II, Si III, IV, and Mg II. use a set of cosmological hydrodynamical zoom simulations run with EAGLE model non-equilibrium ionization cooling module that follows 136 ions. The z~0.2 L* (M_200=10^11.7-10^12.3 Msol) haloes hosting star-forming galaxies group-sized (M_200=10^12.7-10^13.3 mainly passive reproduce key trends COS-Halos survey-- column densities show 1) little dependence on galaxy...

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 cover a limited parameter space due their computational cost. have therefore developed an analytic model follow cooling shocked interstellar medium (ISM) layer of AGN explore different ambient densities (1|$-10^{4} \, \rm {cm}^{-3}$|⁠), density profile slopes (0−1.5), luminosities...

An accurate treatment of the multiphase interstellar medium (ISM) in hydrodynamic galaxy simulations requires that we follow not only thermal evolution gas, but also its chemical state, including molecular chemistry, without assuming (including ionisation) equilibrium. We present a reaction network can be used to solve for this thermo-chemical evolution. Our model follows all ionisation states 11 elements dominate cooling rate, along with important molecules such as H2 and CO, intermediate...

Negative feedback from accreting supermassive black holes is regarded as a key ingredient in suppressing star formation and quenching massive galaxies. However, several models observations suggest that hole may have positive effect, triggering by compressing interstellar medium gas to higher densities. We investigate the dual role of using cosmological hydrodynamic simulations Feedback In Realistic Environments (FIRE) project, including novel implementation hyper-refined accretion-disc...

We extend the non-equilibrium model for chemical and thermal evolution of diffuse interstellar gas presented in Richings et al. (2014) to account shielding from UV radiation field. attenuate photochemical rates by dust gas, including absorption HI, H2, HeI, HeII CO where appropriate. then use this investigate dominant cooling heating processes as it becomes shielded radiation. consider a one-dimensional plane-parallel slab irradiated field, either at constant density temperature or pressure...

We present a series of hydrodynamic simulations isolated galaxies with stellar mass 109 M⊙. The models use resolution 750 M⊙ per particle and include treatment for the full non-equilibrium chemical evolution ions molecules (157 species in total), along gas cooling rates computed self-consistently using abundances. compare these to evolved calculated assuming (including ionization) equilibrium, we consider wide range metallicities UV radiation fields, including local prescription...

Pressure balance plays a central role in models of the interstellar medium (ISM), but whether and how pressure is realized realistic multiphase ISM not yet well understood. We address this question using set FIRE-2 cosmological zoom-in simulations Milky Way-mass disk galaxies, which self-consistently shaped by gravity, cooling, stellar feedback. analyze gravity determines vertical profile as total partitioned between different phases components (thermal, dispersion/turbulence, bulk flows)....

ABSTRACT Observations of local star-forming galaxies (SFGs) show a tight correlation between their singly ionized carbon line luminosity ($L_{\rm [C\, {\small II}]}$) and star formation rate (SFR), suggesting that $L_{\rm II}]}$ may be useful SFR tracer for galaxies. Some other galaxy populations, however, are found to have lower II}]}{}/{}\rm SFR$ than SFGs, including the infrared (IR)-luminous, starburst at low high redshifts as well some moderately SFGs epoch re-ionization (EoR). The...

Abstract We use HDGAS hydrodynamic simulations to study the impact of active galactic nucleus (AGN) feedback on conversion atomic-gas molecular-gas within circumnuclear-disc (CND) a typical AGN-dominated galaxy. The comparison CI, CII, and CO line intensities their ratios in post-processing radiative-transfer analysis reveals complex interplay between AGN-activity, cold molecular gas properties, physical processes governing evolution star-formation galaxies. Our results demonstrate that...

ABSTRACT We investigate the formation of dense stellar clumps in a suite high-resolution cosmological zoom-in simulations massive, star-forming galaxy at z ∼ 2 under presence strong quasar winds. Our include multiphase ISM physics from Feedback In Realistic Environments (FIRE) project and novel implementation hyper-refined accretion disc show that powerful winds can have global negative impact on growth while strongest cases triggering an off-centre clump with mass ${\rm M}_{\star }\sim...

ABSTRACT 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 gravitational instability criterion, but we also density thresholds and temperature ceilings. While SF histories are insensitive the prescription SF, Kennicutt–Schmidt (KS) relations between rate surface can discriminate models. show our model, an...

Recent results indicate a correlation between nuclear radio loudness of active galaxies and their central stellar surface-brightness profiles, in that 'core' (with inner logarithmic slope γ≤ 0.3) are significantly more loud than 'power-law' (γ≥ 0.5). This connection, which indicates possible links galaxy formation history (e.g. through black hole spin), has so far only been confirmed for radio-selected sample galaxies. Furthermore, it since shown the Nuker law, was used to parametrize...

We study the effect of a fluctuating active galactic nucleus (AGN) on abundance circumgalactic OVI in galaxies selected from EAGLE simulations. follow time-variable post-processing around four - two at $z=0.1$ with stellar masses $M_{\ast} \sim 10^{10}$ M$_{\odot}$ and 10^{11}$ M$_{\odot}$, $z=3$ similar out to impact parameters twice their virial radii, implementing central source ionizing radiation. Due delayed recombination, AGN leave significant `AGN proximity zone fossils' all galaxies,...

We present an analysis of giant molecular clouds (GMCs) within hydrodynamic simulations isolated, low-mass (M* ∼ 109 M⊙) disc galaxies. study the evolution abundances and implications for CO emission XCO conversion factor in individual clouds. define either as regions above a density threshold |$n_{\rm {H,} {\rm min}} = 10 \, \rm {cm}^{-3}$|⁠, or using observationally motivated intensity |$0.25 {K} {km} {s}^{-1}$|⁠. Our include non-equilibrium chemical model with 157 species, including 20...

ABSTRACT We present hydrodynamic simulations of the interstellar medium (ISM) within circumnuclear disc (CND) a typical active galactic nucleus (AGN)-dominated galaxy influenced by mechanical feedback from an AGN. The are coupled with CHIMES non-equilibrium chemistry network to treat radiative-cooling and AGN-heating. A focus is placed on central 100 pc scale where AGN outflows ISM constrained observational Seyfert-2 galaxies. AGN-feedback models implemented different wind-velocity...

We report a detailed spectral analysis of the population low-mass X-ray binaries (LMXBs) detected in elliptical galaxy NGC~4278 with Chandra. Seven luminous sources were studied individually, four globular clusters (GCs), and three stellar field. The range (0.3-8 keV) $L_X$ for these suggests that they may be black hole (BHBs). Comparison our results simulations allows us to discriminate between disk power-law dominated emission, pointing spectral/luminosity variability, reminiscent Galactic...

ABSTRACT We present models of CO(1–0) emission from Milky-Way-mass galaxies at redshift zero in the FIRE-2 cosmological zoom-in simulations. calculate molecular abundances by post-processing simulations with an equilibrium chemistry solver while accounting for effects local sources, and determine emergent using a line radiative transfer code. find that results depend strongly on shielding length assumed, which, our models, sets attenuation incident UV radiation field. At resolution these...

ABSTRACT We present an analysis of the physical and dynamical states two sets EAGLE zoom simulations galaxy haloes, one at high redshift (z = 2−3) other low 0), with masses ≈1012 M⊙. Our focus is how circumgalactic medium (CGM) these L* star-forming galaxies change over last 10 Gyr. find that high-z CGM almost equally divided between ‘cool’ (T &amp;lt; 105 K) ‘hot’ ≥ phases, while low-z hot phase contains 5 × more mass than cool phase. The 60 per cent metals CGM, 35 CGM. are evenly...

Observations of emission lines in Active Galactic Nuclei (AGN) often find fast (~1000 km s^-1) outflows extending to kiloparsec scales, seen ionised, neutral atomic and molecular gas. In this work we present radiative transfer calculations hydrodynamic simulations AGN driven by a hot wind bubble, including non-equilibrium chemistry, explore how these trace the physical properties multiphase outflow. We that bubble compresses line-emitting gas, resulting higher pressures than ambient ISM or...

We use smoothed-particle hydrodynamics simulations of isolated Milky Way-mass disk galaxies that include cold, interstellar gas to test subgrid prescriptions for star formation (SF). Our fiducial model combines a Schmidt law with gravitational instability criterion, but we also density thresholds and temperature ceilings. While SF histories are insensitive the prescription SF, Kennicutt-Schmidt (KS) relations between rate surface can discriminate models. show our model, an efficiency per...

We present an analysis of the hot interstellar medium (ISM) in spiral galaxy NGC 4490, which is interacting with irregular 4485, using ~100ks Chandra ACIS-S observations. The high angular resolution enables us to remove discrete sources and perform spatially resolved spectroscopy for star forming regions associated outflows, allowing look at how physical properties ISM such as temperature, hydrogen column density metal abundances vary throughout these galaxies. find temperatures &gt;0.41 keV...