We use the IllustrisTNG simulations to study demographics and properties of jellyfish galaxies in full cosmological context. By galaxies, we mean satellites orbiting massive groups clusters that exhibit highly asymmetric distributions gas tails. In particular, select TNG100 at low redshifts (⁠|$z$| ≤ 0.6) with stellar mass exceeding |$10^{9.5} \, \mathrm{M_{\odot }}$| host halo masses range |$10^{13} \le M_{\rm 200c}/\, }}\le 10^{14.6}$|⁠. Among more than about 6000 (2600) stars (and some...

We use the IllustrisTNG simulations to show how fractions of quenched galaxies vary across different environments and cosmic time, quantify role AGN feedback preprocessing play in quenching group cluster satellites. At $z=0$, we select with $M_* = 10^{9-12} M_{\odot}$ residing within ($\leq R_{200c}$) groups clusters total host mass $M_{200c}=10^{13-15.2} M_{\odot}$. TNG predicts a fraction $\sim70-90\%$ (on average) for centrals satellites $\gtrsim 10^{10.5} M_{\odot}$, regardless mass,...

We study the stellar morphological evolution of disc galaxies within clusters in TNG50 and TNG100 runs from IllustrisTNG simulation suite. select satellites masses $10^{9.7} \leq M_{*,z=0}/\text{M}_{\odot} 10^{11.6}$ residing $10^{14} \lesssim M_{\text{200c,z=0}}/\text{M}_{\odot} 10^{14.6}$ at $z=0$ that were discs accretion according to a kinematic morphology indicator (the circularity fraction). These are traced time compared control sample central mass-matched accretion. Most cluster...

We present the cumulative star-formation histories (SFHs) of >15000 dwarf galaxies ($M_{*}=10^{7-10}M_{\odot}$) from TNG50 run IllustrisTNG suite across a vast range environments. The key factors determining dwarfs' SFHs are their status as central or satellite and stellar mass, with centrals more massive dwarfs assembling mass at later times on average compared to satellites lower dwarfs. (in hosts total $M_{200c,\,host}=10^{12-14.3}M_{\odot}$) assembled 90% z=0 ~$7.0_{-5.5}^{+3.3}$ Gyr...

We analyze the merger and assembly histories of Milky Way (MW) Andromeda (M31)-like galaxies to quantify how, how often, disk this mass can survive recent major mergers (stellar ratio $\ge$ 1:4). For this, we use cosmological magneto-hydrodynamical simulation TNG50 identify 198 analog galaxies, selected based on their $z=0$ stellar ($10^{10.5-11.2} {\rm M_{\odot}}$), disky morphology local environment. Firstly, are common: 85 per cent (168) MW/M31-like in have undergone at least one across...

ABSTRACT Jellyfish galaxies are prototypical examples of satellite undergoing strong ram pressure stripping (RPS). We analyse the evolution 512 unique, first-infalling jellyfish from TNG50 cosmological simulation. These have been visually inspected to be RPS sometime in past 5 Byr (since z = 0.5), stellar masses $M_\star ^{\rm sat}\sim 10^{8\!-\!10.5}\, {\rm M}_\odot$, and live hosts with $M_{\rm 200c}\sim 10^{12\!-\!14.3}\, M}_\odot$ at 0. quantify cold gas (T ≤ 104.5 K) removal using...

We analyse the quenched fractions, gas content, and star formation histories of ~1200 satellite galaxies with $M_* \geq 5 \times 10^6~{\rm M}_\odot$ around 198 Milky Way- (MW) Andromeda-like (M31) hosts in TNG50, highest-resolution simulation IllustrisTNG. Satellite fractions are larger for smaller masses, distances to their host galaxy, more massive M31-like compared MW-like hosts. As satellites cross host's virial radius, content drops: most within 300 kpc lack detectable reservoirs at...

ABSTRACT We present a new suite of cosmological zoom-in hydrodynamical ($\approx 20\, \mathrm{pc}$ spatial resolution) simulations Milky-Way mass galaxies to study how varying ratio for Gaia-Sausage-Enceladus (GSE) progenitor impacts the z = 0 chemodynamics halo stars. Using genetic modification approach, we create five histories Milky-Way-mass dark matter ($M_{200}\approx 10^{12} \, \mbox{M}_\mathrm{\odot }$), incrementally increasing stellar ≈ 2 merger from 1:25 1:2, while fixing galaxy’s...

Abstract We compile a sample of Sloan Digital Sky Survey (SDSS) galaxy clusters with high-quality Chandra X-ray data to directly study the influence dense intracluster medium (ICM) on quenching satellite galaxies. quenched fractions galaxies as function ICM density for low- (10 9 ≲ M ⋆ 10 ⊙ ), intermediate- 10.5 and high-mass ( ≳ ) >3000 across 24 low-redshift z < 0.1) clusters. For low-mass we find evidence broken power-law trend between fraction local density. The increases modestly...

We study the stellar-to-halo mass relation (SHMR) for central and satellite galaxies with total dynamical masses above 10^10.5 Msun using suite of cosmological magneto-hydrodynamical simulations IllustrisTNG. In particular, we quantify environmental effects on populations from TNG50, TNG100, TNG300 located within virial radius group- cluster-like hosts 10^12-15.2 Msun. At fixed stellar mass, SHMR exhibits a distinct shift towards lower compared to centrals. Conversely, at appear have larger...

ABSTRACT Due to ram-pressure stripping (RPS), jellyfish galaxies are thought lose large amounts, if not all, of their interstellar medium. Nevertheless, some, but observations suggest that exhibit enhanced star formation compared control samples, even in ram pressure-stripped tails. We use the TNG50 cosmological gravity + magnetohydrodynamical simulation, with an average spatial resolution 50–200 pc star-forming regions galaxies, quantify activity and rates (SFRs) more than 700 at z = 0–1...

Abstract How mergers affect galaxy formation depends on both feedback processes, and the geometry strength of themselves. We introduce PARADIGM project, where we study response a simulated Milky-Way-mass (M200c ∼ 1012M⊙ at z = 0) forming in cosmological setting to differing merger histories, using genetically modified initial conditions, each with VINTERGATAN IllustrisTNG codes. While has been developed an emphasis resolving cold interstellar medium, uses subgrid two-phase model consequently...

Abstract Filaments of the cosmic web have long been associated with threadlike structures seen in galaxy redshift surveys. However, despite their baryon content being dominated by hot gas, these filaments an elusive target for X-ray observations. Recently, detections very deep (2.4 Ms) observations Chandra were reported around Abell 133 ( z = 0.0559). To verify claims, we conducted a multiobject spectrographic campaign on Baade 6.5 m telescope 133; this resulted catalog ∼3000 new...

Abstract It has been shown that galaxy properties depend strongly on their host environment. In order to understand the relevant physical processes driving evolution it is important study observed of galaxies in different environments. Mass segregation bound structures an indicator evolutionary history and dynamical friction time-scales. Using group catalogues derived from Sloan Digital Sky Survey Data Release 7 (SDSS DR7), we investigate mass-segregation trends groups at low redshift. We...

We investigate the mass loss of galaxies in groups and clusters with high-resolution DM simulations. detect weak segregation inner regions group/cluster haloes, consistent observational findings. This applies to samples galaxy analogues selected using either their present-day or past maximum (peak) mass. find a strong radial trend fractional lost by since peak, independent suggests that is due massive having formed closer halo centres not preferential destruction smaller near centres. divide...

ABSTRACT We present the ‘Cosmological Jellyfish’ project – a citizen-science classification program to identify jellyfish (JF) galaxies within IllustrisTNG cosmological simulations. JF are satellite that exhibit long trailing gas features ‘tails’ extending from their stellar body. Their distinctive morphology arises due ram-pressure stripping (RPS) as they move through background gaseous medium. Using TNG50 and TNG100 simulations, we construct sample of $\sim 80\, 000$ spanning an...

We present a study of environmental effects and preprocessing in large galaxy group using high-resolution, zoom-in simulation run with the gasoline2 hydrodynamics code. categorize galaxies that were always distinct haloes as unaccreted, before accretion on to main single, external sub-groups grouped. The unaccreted population experiences steady growth dark matter, gas, stellar mass. Both single- group-accreted begin lose matter gas after first any host but continue grow Individual...

We present the ``Cosmological Jellyfish'' project - a citizen-science classification program to identify jellyfish galaxies within IllustrisTNG cosmological simulations. Jellyfish (JF) are satellite that exhibit long trailing gas features -- `tails' extending from their stellar body. Their distinctive morphology arises due ram-pressure stripping (RPS) as they move through background gaseous medium. Using TNG50 and TNG100 simulations, we construct sample of $\sim 80,000$ spanning an...

We investigate mass segregation in group and cluster environments by identifying galaxy analogues high-resolution dark matter simulations. Subhalos identified the AHF ROCKSTAR halo finders have similar functions, independent of resolution, but different radial distributions due to significantly subhalo hierarchies. propose a simple way classify subhalos as analogues. The agree well at large halo-centric radii for both disagree near parent centres where phase-space information used is...

ABSTRACT We investigate the impact of a galaxy’s merger history on its system satellites using new vintergatan-gm suite zoom-in hydrodynamical simulations Milky Way-mass systems. The simulates five realizations same halo with targeted ‘genetic modifications’ z ≈ 2 merger, but resulting in mass at = 0. find that differences satellite stellar functions last for 2.25−4.25 Gyr after merger; specifically, haloes have undergone smaller mergers host up to 60 per cent more than those larger...

Due to ram-pressure stripping, jellyfish galaxies are thought lose large amounts, if not all, of their interstellar medium. Nevertheless, some, but observations suggest that exhibit enhanced star formation compared control samples, even in ram pressure-stripped tails. We use the TNG50 cosmological gravity+magnetohydrodynamical simulation, with an average spatial resolution 50-200 pc star-forming regions galaxies, quantify activity and rates (SFRs) more than 700 at $z=0-1$ stellar masses...

Jellyfish galaxies are the prototypical examples of satellite undergoing strong ram pressure stripping (RPS). We analyze evolution 535 unique, first-infalling jellyfish from TNG50 cosmological hydrodynamical galaxy simulation. These have been visually inspected to be RPS sometime in past 5 billion years (since $z=0.5$), stellar masses $M_{\star}^{\rm sat}\sim10^{8-10.5}{\rm M}_\odot$, and live hosts with $M_{\rm 200c}\sim10^{12-14.3}{\rm M}_\odot$ at $z=0$. quantify cold gas...

We investigate the impact of a galaxy's merger history on its system satellites using new \textsc{vintergatan-gm} suite zoom-in hydrodynamical simulations Milky Way-mass systems. The simulates five realizations same halo with targeted `genetic modifications' (GMs) $z \approx 2$ merger, but resulting in mass at $z=0$. find that differences satellite stellar functions last for $2.25-4.25$ Gyr after merger; specifically, haloes have undergone smaller mergers host up to 60\% more than those...

The way in which mergers affect galaxy formation depends on both feedback processes, and the geometry strength of themselves. We introduce PARADIGM project, where we study response a simulated Milky-Way-mass forming cosmological setting to differing merger histories, using genetically modified initial conditions. Each condition is with VINTERGATAN IllustrisTNG codes. While has been developed an emphasis resolving cold interstellar medium, uses subgrid two-phase model consequently scales...

We analyse the quenched fractions, gas content, and star formation histories of ~1200 satellite galaxies with $M_* \geq 5 \times 10^6~{\rm M}_\odot$ around 198 Milky Way- (MW) Andromeda-like (M31) hosts in TNG50, highest-resolution simulation IllustrisTNG. Satellite fractions are larger for smaller masses, distances to their host galaxy, more massive M31-like compared MW-like hosts. As satellites cross host's virial radius, content drops: most within 300 kpc lack detectable reservoirs at...