A5043457708- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Remote Sensing in Agriculture
- Astrophysics and Cosmic Phenomena
- Agricultural and Food Production Studies
- Plant Water Relations and Carbon Dynamics
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Cannabis and Cannabinoid Research
- Respiratory Support and Mechanisms
- Astrophysical Phenomena and Observations
- Archaeological and Geological Studies
- Statistical and numerical algorithms
- Impact of Light on Environment and Health
- Geophysics and Gravity Measurements
- Water Resource Management and Quality
- Airway Management and Intubation Techniques
- Space Science and Extraterrestrial Life
- Diabetes and associated disorders
- Spectroscopy and Laser Applications
- Archaeological and Historical Studies
Consejo Nacional de Investigaciones Científicas y Técnicas
2015-2024
Argentine National Observatory
2015-2024
Universidad Nacional de Córdoba
2015-2024
Instituto de Astronomía Teórica y Experimental
2015-2024
Hospital Vozandes
2019
Medico
2019
UCL Australia
2016
Universidad de La Sabana
2015
Hospital Militar Central
2015
Ohio University
2012
The ever increasing size and complexity of data coming from simulations cosmic structure formation demands equally sophisticated tools for their analysis. During the past decade, art object finding in these has hence developed into an important discipline itself. A multitude codes based upon a huge variety methods techniques have been spawned yet question remained as to whether or not they will provide same (physical) information about structures interest. Here we summarize extent previous...
We present a detailed comparison of the substructure properties single Milky Way sized dark matter halo from Aquarius suite at five different resolutions, as identified by variety (sub)halo finders for simulations cosmic structure formation. These span wide range techniques and methodologies to extract quantify substructures within larger non-homogeneous background density (e.g. host halo). This includes real-space-, phase-space-, velocity-space- time-space-based finders, well employing...
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 make use of a semi-analytical model galaxy formation to investigate the origin observed correlation between [a/Fe] abundance ratios and stellar mass in elliptical galaxies. implement new galaxy-wide initial function (Top Heavy Integrated Galaxy Initial Mass Function, TH-IGIMF) semi-analytic SAG evaluate its impact on chemical evolution The SFR-dependence slope TH-IGIMF is found be key reproducing correct [a/Fe]-stellar relation. Massive galaxies reach higher because they are characterized...
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...
Galaxy surveys targeting emission lines are characterizing the evolution of star-forming galaxies, but there is still little theoretical progress in modelling their physical properties. We predict nebular from galaxies within a cosmological galaxy formation model. Emission computed by combining semi-analytical model sag with photoionization code mappings-iii. characterize interstellar medium relating ionization parameter gas to cold metallicity, obtaining reasonable agreement observed Hα, [O...
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...
Clusters of galaxies have proven to be efficient systems in modifying various properties galaxies, such as star formation or morphology. However, projection effects impose serious challenges determining how, when, and what extent are affected by the cluster environment. Using innovative techniques classify based on their history within cluster, we aim determine how different classes We applied ROGER code select trajectories phase space for 35 galaxy clusters from OmegaWINGS survey. A new...
The evolution of galaxies is significantly influenced by the environments they inhabit. While high-density regions, such as clusters have been widely studied, dynamics and quenching processes in intermediate remain less explored. These systems provide a valuable context for understanding transition from active star formation to quiescence. This study aims characterise astrophysical properties intermediate-mass galaxy groups ($13.5 ≤ /M_ ⊙ ) 13.7$), with focus on their evolutionary pathways...
We present a new technique for modelling submillimetre galaxies (SMGs): the ‘Count Matching’ approach. Using light cones drawn from semi-analytic model of galaxy formation, we choose physical properties given by as proxies their luminosities, assuming monotonic relationship. As recent interferometric observations Extended Chandra Deep Field-South show that brightest sources detected single-dish telescopes are comprised emission multiple fainter sources, assign fluxes so combined Large APEX...
Voids are promising cosmological probes. Nevertheless, every test based on voids must necessarily employ methods to identify them in redshift space. Therefore, redshift-space distortions (RSD) and the Alcock-Paczynski effect (AP) have an impact void identification process itself generating distortion patterns observations. Using a spherical finder, we developed statistical theoretical framework describe physically connection between real We found that above shot noise level unique real-space...
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...
Abstract The large-scale environment of the cosmic web is believed to impact galaxy evolution, but there still no consensus regarding mechanisms. We use a semi-analytic model (SAM) catalog study star formation and dust content local galaxies in different environments web—namely voids, filaments, walls, nodes. find strong only for with M stars ≲ 10 10.8 ⊙ : less dense environment, larger rate at fixed stellar mass. This attributed fact that typically feature younger populations, slower...
We present a study of comparison spin distributions subhaloes found associated with host halo. The are within two cosmological simulation families Milky Way-like galaxies, namely the Aquarius and GHALO simulations. These simulations use different gravity codes cosmologies. employ 10 substructure finders, which span wide range methodologies from simple overdensity in configuration space to full 6D phase analysis particles. subject results common post-processing pipeline analyse consistent...
Inspired on the well known dynamical dichotomy predicted in voids, where some underdense regions expand whereas others collapse due to overdense surrounding regions, we explored interplay between void inner dynamics and its large scale environment. The environment is classified depending density as previous works. We analyse properties of void-centered spherical shells at different void-centric distances this classification. above are given by angular distribution radial velocity field,...
Resumen El ganado criollo colombiano comprende un grupo de razas que se han adaptado por más 400 años a las condiciones ecoclimáticas nuestro país, razón la cual poseen características adaptativas suma importancia podrían ser utilizadas una manera racional en programas conservación y mejoramiento animal. Lo anterior podría realizar eficiente si tuviese adecuado conocimiento del grado variabilidad genética cada estas razas, pues este es el parámetro última instancia determina éxito o fracaso...
The angular momentum of galactic discs in semi-analytic models galaxy formation is usually updated time as material accreted to the disc by adopting a constant dimensionless spin parameter and little attention paid effects accretion with misaligned momenta. These are subject this paper, where we adopt Monte-Carlo simulation for changes direction it accretes matter based on accurate measurements from dark-matter haloes Millennium II simulation. In our model implementation, flips seen dark...
Galaxies in cosmic voids have been reported with properties related to a delayed evolution respect the Universe general. These characteristics reflect interaction of galaxies environment. However, it is not clear degree influence large-scale structure on void or, if these are only influenced by low local density around them typical regions. In this article we identified SDSS-DR16 and studied various galaxies, such as g-r colour, star formation rate, concentration. To characterise...
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...
Abstract We compute the bulk motions of cosmic voids, using a Λ cold dark matter numerical simulation considering mean velocities inside void itself and that haloes in surrounding shell. find coincident values these two measures range ∼300–400 km s−1, not far from expected peculiar groups galaxy clusters. When analysing distribution pairwise relative we remarkable bimodal behaviour consistent with an excess both systematically approaching receding voids. determine origin this bimodality...
We present a new cosmological test using the distribution of galaxies around cosmic voids without assuming fiducial cosmology. The is based on physical model for void–galaxy cross-correlation function projected along and perpendicular to line sight. treat correlations in terms void-centric angular distances redshift differences between pairs, hence it not necessary assume This reproduces coupled dynamical (Kaiser effect, RSD) geometrical (Alcock–Paczynski GD) distortions that affect...
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...