A5048178025- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Radio Astronomy Observations and Technology
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- Cultural and Mythological Studies
- Earth Systems and Cosmic Evolution
- Archaeological and Historical Studies
- Advanced Physical and Chemical Molecular Interactions
- Plant and Biological Electrophysiology Studies
- Magnetic Properties and Applications
- Dark Matter and Cosmic Phenomena
- Plant Water Relations and Carbon Dynamics
- Ecosystem dynamics and resilience
- Electrostatics and Colloid Interactions
- Cognitive Abilities and Testing
- Statistical and numerical algorithms
- CCD and CMOS Imaging Sensors
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
University of La Serena
2019-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2013-2018
Instituto de Astrofísica de La Plata
2013-2018
We introduce the Uchuu suite of large high-resolution cosmological $N$-body simulations. The largest simulation, named Uchuu, consists 2.1 trillion ($12800^3$) dark matter particles in a box side-length 2.0 Gpc/h, with particle mass $3.27 \times 10^{8}$ Msun/h. highest resolution Shin-Uchuu, 262 billion ($6400^3$) 140 Mpc/h, $8.97 10^{5}$ Combining these simulations we can follow evolution halos and subhalos spanning those hosting dwarf galaxies to massive galaxy clusters across an...
We introduce the THE THREE HUNDRED project, an endeavour to model 324 large galaxy clusters with full-physics hydrodynamical re-simulations. Here we present data set and study differences observations for fundamental cluster properties scaling relations. find that modelled are generally in reasonable agreement respect baryonic fractions gas relations at redshift z = 0. However, there still some (model-dependent) differences, such as central galaxies being too massive, colours (g - r) bluer...
We present results from the semi-analytic model of galaxy formation SAG applied on MultiDark simulation MDPL2. features an updated supernova (SN) feedback scheme and a robust modelling environmental effects satellite galaxies. This incorporates gradual starvation hot gas halo driven by action ram pressure stripping (RPS), that can affect cold disc, tidal (TS), which act all baryonic components. Galaxy orbits orphan satellites are integrated providing adequate positions velocities for...
We present the public release of MultiDark-Galaxies: three distinct galaxy catalogues derived from one Planck cosmology MultiDark simulations (i.e. MDPL2, with a volume (1 Gpc/$h$)$^{3}$ and mass resolution $1.5 \times 10^{9} M_{\odot}/h$) by applying semi-analytic models GALACTICUS, SAG, SAGE to it. compare their conformity observational data for selection fundamental properties galaxies like stellar function, star formation rate, cold gas fractions, metallicities - noting that they...
We present a comparison of 14 galaxy formation models: 12 different semi-analytical models and 2 halo occupation distribution for based upon the same cosmological simulation merger tree information derived from it. The participating codes have proven to be very successful in their own right but they all been calibrated independently using various observational data sets, stellar models, trees. In this paper, we apply them without recalibration leads wide variety predictions mass function,...
We present a fast and accurate method to select an optimal set of parameters in semi-analytic models galaxy formation evolution (SAMs). Our approach compares the results model against observables applying stochastic technique called Particle Swarm Optimization (PSO), self-learning algorithm for localizing regions maximum likelihood multidimensional spaces that outperforms traditional sampling methods terms computational cost. apply PSO SAG combined with merger trees extracted from standard...
Studies of galaxy populations classified according to their kinematic behaviours and dynamical state using the Projected Phase Space Diagram (PPSD) are affected by misclassification contamination, leading systematic errors in determining characteristics different classes. We propose a method statistically correct determination properties' distributions accounting for contamination caused misclassified galaxies from other Using sample massive clusters surroundings taken MultiDark Planck 2...
Studies of galaxy populations classified according to their kinematic behaviours and dynamical state using the projected phase space diagram (PPSD) are affected by misclassification contamination, leading systematic errors in determining characteristics different classes. We propose a method for statistically correcting determination properties' distributions that accounts contamination caused misclassified galaxies from other Using sample massive clusters surroundings taken MultiDark Planck...
The environment within dark matter haloes can quench the star formation of galaxies. However, environmental effects beyond virial radius ($\gtrsim$ 1 Mpc) are less evident. An example is debated correlation between colour or in central galaxies and neighbour adjacent at large separations several Mpc, referred to as two-halo galactic conformity. We use two galaxy catalogues generated from different versions semi-analytic model SAG applied MDPL2 cosmological simulation IllustrisTNG300...
We use the semi-analytic model of galaxy formation SAG to study relevance mass and environmental quenching on satellite galaxies. find that processes dominate star (SF) low-mass satellites ($M_{\star} \lesssim 10^{10.5}\, {\rm M}_{\odot}$), whereas high-mass galaxies typically quench as centrals. High-mass remain actively forming stars while being accreted are found be mainly affected by after their first infall. For a given stellar mass, our predicts SF less efficient in haloes both before...
We present a clustering comparison of 12 galaxy formation models [including semi-analytic (SAMs) and halo occupation distribution (HOD) models] all run on catalogues merger trees extracted from single Λ cold dark matter N-body simulation. compare the results measurements mean numbers, radial galaxies in haloes two-point correlation functions (2PCF). also study implications different treatments orphan (galaxies not assigned to any subhalo) non-orphan these measurements. Our main result is...
We use the semi-analytic model (SAM) of galaxy formation and evolution sag coupled with multidark simulation MDPL2 to study stellar – gas metallicity relation galaxies (MZR). test several implementations dependence mass loading due supernovae (SNe). find that no in normalization MZR is obtained unless we introduce an explicit scaling reheated ejected redshift as (1 + |$z$|)β. The latter agreement results from FIRE simulations, it should encompass small-scale properties interstellar medium...
We explore the buildup of quiescent galaxies using a sample 28,469 massive ($M_\star \ge 10^{11}$M$_\odot$) at redshifts $1.5<z<3.0$, drawn from 17.5 deg$^2$ area (0.33 Gpc$^3$ comoving volume these redshifts). This allows for robust study fraction as function mass $1.5<z<3.0$ with $\sim$40 times larger log($M_{\star}$/$\rm M_{\odot}$)$\ge11.5$ than previous studies. derive three methods: specific star-formation rate, distance main sequence, and UVJ color-color selection. All methods give...
We study the evolution of satellite galaxies in clusters \textsc{c-eagle} simulations, a suite 30 high-resolution cosmological hydrodynamical zoom-in simulations based on \textsc{eagle} code. find that majority are quenched at $z=0$ ($\gtrsim$ 80$\%$) reached this state dense environment (log$_{10}$M$_{200}$[M$_{\odot}$]$\geq$13.5). At low redshift, regardless final cluster mass, appear to reach their quenching low-mass clusters. Moreover, inside they reside dominant population clusters,...
In this work, we combine the semi-analytic model of galaxy formation and evolution SAG with $102$ relaxed simulated clusters from The Three Hundred project, study link between quenching star (SF) physical processes that galaxies experience through their dynamical history in around clusters. We classify four populations based on orbital history: recent ancient infallers, backsplash neighbouring galaxies. find $\sim 85$ per cent current population quenched located inside are infallers low or...
We present a comparison of nine galaxy formation models, eight semi-analytical, and one halo occupation distribution model, run on the same underlying cold dark matter simulation (cosmological box comoving width 125h−1 Mpc, with dark-matter particle mass 1.24 × 109h−1M⊙) merger trees. While their free parameters have been calibrated to observational data sets using two approaches, they nevertheless retain some ‘memory’ any previous calibration that served as starting point (especially for...
The use of high-quality simulated sky catalogs is essential for the success cosmological surveys. have diverse applications, such as investigating signatures fundamental physics in observables, understanding effect systematic uncertainties on measured signals and testing mitigation strategies reducing these uncertainties, aiding analysis pipeline development testing, survey strategy optimization. list applications growing with improvements quality details that they can provide. Given...
We use three semi-analytic models (SAMs) of galaxy formation and evolution, run on the same 1$h^{-1}$Gpc MultiDark Planck2 cosmological simulation, to investigate properties [OII] emission line galaxies in redshift range $0.6
We present a comparison of the observed evolving galaxy stellar mass functions with predictions eight semi-analytic models and one halo occupation distribution model. While most are able to fit data at low redshift, some them struggle simultaneously observations high redshift. separate galaxies into 'passive' 'star-forming' classes find that several produce too many low-mass star-forming redshift compared observations, in cases by nearly factor 10 range $2.5 < z 3.0$. also important...
Abstract Finding life in the Universe entirely different to one evolved on Earth is probable. This a significant constraint for life-detecting instruments that were sent and may be elsewhere solar system, as how could we detect ‘we don't know it’? How something when have no prior knowledge of its composition or it looks like? Here argue disregarding type lifeform envisioned, all must share common attribute being entities decrease their internal entropy at expense free energy obtained from...
We present the ROGER (Reconstructing Orbits of Galaxies in Extreme Regions) code, which uses three different machine learning techniques to classify galaxies in, and around, clusters, according their projected phase-space position. use a sample 34 massive, $M_{200}>10^{15} h^{-1} M_{\odot}$, galaxy clusters MultiDark Planck 2 (MDLP2) simulation at redshift zero. select all with stellar mass $M_{\star} \ge 10^{8.5} h^{-1}M_{\odot}$, as computed by semi-analytic model formation SAG, that are...
We present a new analytic fitting profile to model the ram pressure exerted over satellite galaxies on different environments and epochs. The is built using information of gas particle distribution in hydrodynamical simulations groups clusters measure directly. show that predictions obtained by previously introduced $\beta$-profile can not consistently reproduce dependence halocentric distance redshift for given halo mass. It features systematic underestimation predicted at high redshifts...
ABSTRACT We analyse the connection between star formation quenching of galaxies and their location in outskirts clusters redshift range z = [0, 2] by estimating fraction red galaxies. More specifically, we focus on that infall isotropically from those are infalling alongside filaments. use a sample obtained semi-analytical model galaxy sag applied to MultiDark simulation, mdpl2. In agreement with observational results, find regions show levels intermediate field. Moreover, that, [0–0.85], is...
We studied a region of 1.636 square degrees corresponding to the VVV tile $b204$. Using SExtractor, we analysed photometric data generating catalogue extended sources in this area. In order confirm these as galaxy candidates visually inspected RGB images looking for typical features. 2MASX and GCMW catalogued tested completeness contamination our define suitable colour cuts select galaxies. also compared observational results with those obtained from two semi-analytical models on Dark Matter...
We connect galaxy properties with their orbital classification by analysing a sample of galaxies stellar mass $M_{\star} \geq 10^{8.5}h^{-1}M_\odot$ residing in and around massive isolated clusters $M_{200} > 10^{15}h^{-1}M_\odot$ at redshift $z=0$. The population is generated applying the semi-analytic model formation SAG on cosmological simulation MultiDark Planck 2. classify considering real orbits (3D) projected phase-space position using ROGER code (2D). define five categories:...