A5003096145- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Social Media and Politics
- Astronomical Observations and Instrumentation
- Cosmology and Gravitation Theories
- Cardiovascular Syncope and Autonomic Disorders
- Social Capital and Networks
- Scientific Research and Discoveries
- Impact of Light on Environment and Health
- Cardiac Arrhythmias and Treatments
- Solar and Space Plasma Dynamics
- Image Processing Techniques and Applications
- Youth Education and Societal Dynamics
- Remote Sensing in Agriculture
- Gestational Diabetes Research and Management
- CCD and CMOS Imaging Sensors
- Gamma-ray bursts and supernovae
- Psychology Research and Bibliometrics
- Nonprofit Sector and Volunteering
- Remote Sensing and LiDAR Applications
- Astrophysics and Cosmic Phenomena
- Pregnancy and preeclampsia studies
- Heart Rate Variability and Autonomic Control
Pontificia Universidad Católica de Chile
2012-2024
Baker Hughes (United States)
2017
University of Chicago
2013-2014
Institut de Radioprotection et de Sûreté Nucléaire
1995
The cosmic web is one of the most striking features distribution galaxies and dark matter on largest scales in Universe. It composed dense regions packed full galaxies, long filamentary bridges, flattened sheets vast low-density voids. study has focused primarily identification such features, understanding environmental effects galaxy formation halo assembly. As such, a variety different methods have been devised to classify – depending data at hand, be it numerical simulations, large sky...
Despite global commitments and efforts, a gender‐based division of paid unpaid work persists. To identify how psychological factors, national policies, the broader sociocultural context contribute to this inequality, we assessed parental‐leave intentions in young adults (18–30 years old) planning have children ( N = 13,942; 8,880 identified as women; 5,062 men) across 37 countries that varied policies societal gender equality. In all countries, women intended take longer leave than men....
ABSTRACT In this work, we aim at investigating the morphology evolution of Milky Way mass-like dark matter haloes selected from cielo and IllustrisTNG projects. The connection between halo shapes their environment has been studied in previous works z = 0 but remains yet to be fully understood. We focus on across cosmic time relation with infalling material, using hydrodynamical simulations. Our findings show that tend more triaxial earlier times as a consequence stronger accretion direction...
We present a new method to identify large-scale filaments and apply it cosmological simulation. Using positions of haloes above given mass as node tracers, we look for between them using the masses all remaining dark matter (DM) haloes. In order detect filament, first step consists in construction backbone linking two nodes, which is by skeleton-like path connecting highest local DM density traced non-node The filament quality defined gap parameters characterizing its skeleton, members are...
We use recent proper motion measurements of the tangential velocity M31, along with its radial and distance, to derive likelihood sum halo masses Milky Way M31. This is done using a sample pairs in Bolshoi cosmological simulation ΛCDM cosmology selected match properties environment Local Group. The resulting gives an estimate MMW, 200c + MM31, = (90% confidence interval). consistent individual mass estimates for M31 consistent, albeit somewhat on low side, estimated timing argument. show...
Previous studies showed that an estimate of the likelihood distribution Milky Way (MW) halo mass can be derived using properties satellites similar to Large and Small Magellanic Clouds (LMC SMC). However, it would straightforward interpret such only if (MCs) are fairly typical not biased by environment. In this study, we explore whether environment MW affects SMC LMC as their velocities. To test for effect environment, compare velocity distributions MC-sized subhalos around hosts in a sample...
We present the HI mass inventory for RESOLVE survey, a volume-limited, multi-wavelength census of >1500 z=0 galaxies spanning diverse environments and complete in baryonic down to dwarfs 10^9 Msun. This first 21cm data release provides robust detections or strong upper limits (1.4M_HI < 5 10% stellar M_stars) 94% RESOLVE. examine global atomic gas-to-stellar ratios (G/S) relation galaxy environment using several metrics: group dark matter halo M_h , central/satellite designation, relative...
La pregunta sobre la existencia de características comunes inherentes a psicología los pueblos Indígenas todo el mundo ha sido objeto mucho debate. Nosotros argumentamos que comparten experiencia colonización, así como sus consecuencias sociales y psicológicas. Desarrollamos este argumento en cuatro secciones: (a) historia global colonización las desigualdades sociales; (b) aspectos relativos identidad procesos grupales, incluidas transmisión intergeneracional valores compartidos, conexión...
We study the properties of SDSS galaxies with and without AGN detection as a function local global environment measured via density, mass galaxy host group (parameterised by luminosity) distance to massive clusters. Our results can be divided in two main subjects, environments their relation assembly haloes, AGN. (i) For full sample, we find indications that density is most efficient parameter separate populations, but also at fixed show some remaining variation nearest cluster (in range 0...
We study the correlation between specific star formation rate of central galaxies and neighbour galaxies, also known as 'galactic conformity', out to 20 Mpc/h using three semi-analytic models (SAMs, one from L-GALAXIES other two GALFORM). The aim is establish whether SAMs are able show galactic conformity different selection criteria. In all models, when primary based on an isolation criterion in real space, mean fraction quenched around higher than that star-forming same stellar mass....
In order to elucidate the origin of spin in both dark matter and baryons galaxies, we have performed hydrodynamical simulations from cosmological initial conditions. We study atomic cooling haloes redshift range $100 > z 9$ with masses $10^9{\rm M_{\odot}}$ at $z=10$. assume that gas has primordial composition ${\rm H_2}$-cooling prior star-formation been suppressed. present a comprehensive analysis properties four halos very low ($\lambda \approx 0.01$), 0.04$), high 0.06$) 0.1$) parameter....
ABSTRACT We study the impact of environment on galaxies as they fall in and orbit potential well a Local Group (LG) analogue, following them with high cadence. The analysis is performed eight disc satellite from CIELO suite hydrodynamical simulations. All have stellar masses within range $[10^{8.1}\!-\!10^{9.56}] \, \mathrm{M}_{\odot }\, {\rm h}^{-1}$. measure tidal torques, ram pressure, specific star formation rates (sSFRs) function time, correlate amount gas lost by satellites along their...
We track subhalo orbits of galaxy- and group-sized halos in cosmological simulations. identify filamentary structures around use these to define a sample subhalos accreted from filaments, as well control other directions. samples study differences satellite produced by accretion. Our results depend on host halo mass. find that for low masses, filaments show ∼10% shorter lifetimes compared the sample, tendency toward more radial orbits, reach central regions earlier, are likely merge with...
We explore the characteristics of cosmic web around Local Group(LG) like pairs using a cosmological simulation in $\Lambda$CDM cosmology. use Hessian gravitational potential to classify regions on scales $\sim 2$ Mpc as peak, sheet, filament or void. The sample LG counterparts is represented by two samples halo pairs. first general composed with similar masses and isolation criteria observed for LG. second subset additional kinematic constraints such relative pair velocity separation. find...
We compute the galaxy luminosity function in spectroscopically selected nearby groups and clusters. Our sample comprises 728 systems extracted from third release of Sloan Digital Sky Survey redshift range with virial mass . To function, we apply a statistical background subtraction method following usually adopted techniques. In r band, composite shows slope bright–end, an upturn faint–end, , to slopes find that this feature is present also z bands, for all explored group subsamples,...
We use a semi-analytic model of galaxy formation to study signatures large-scale modulations in the star (SF) activity galaxies. In order do this we carefully define local and global estimators density around The former are computed using voronoi tessellation technique latter parameterised by normalised distance haloes voids, terms virial void radii, respectively. As function density, galaxies show strong modulation their SF, result that is agreement with those from several authors. When...
Using data from TNG300-2, we train a neural network (NN) to recreate the stellar mass ($M^*$) and star formation rate (SFR) of central galaxies in dark-matter-only simulation. We consider 12 input properties halo sub-halo hosting galaxy near environment. $M^*$ predictions are robust, but machine does not fully reproduce its scatter. The same happens for SFR, as good $M^*$. chained networks, improving on SFR some extent. For time-averaged this value between $z=0$ $z=0.1$, which improved...
We investigate the spin evolution of dark matter haloes and their dependence on number connected filaments from cosmic web at high redshift (spin-filament relation hereafter). To this purpose, we have simulated $5000$ in mass range $5\times10^{9}h^{-1}M_{\odot}$ to $5\times10^{11}h^{-1}M_{\odot}$ $z=3$ cosmological N-body simulations. confirm found by Prieto et al. 2015 where with fewer larger spin. also that is more significant for higher halo masses, a passive (no major mergers) assembly...
We measure the evolution of galaxy clustering out to a redshift z≃ 1.5 using data from two Multi-wavelength Survey by Yale–Chile (MUSYC) fields, Extended Hubble Deep Field-South (EHDF-S) and Chandra (ECDF-S). use photometric information calculate projected-angular correlation function, ω(σ), which we infer projected function Ξ(σ). demonstrate that this technique delivers accurate measurements even when large measurement errors affect data. To aim mock MUSYC fields extracted Λ-cold dark...
We present a study on the variations of luminosity function galaxies around clusters in numerical simulation with semi-analytic galaxies, attempting to detect these 2dF Galaxy Redshift Survey. subdivide box equal-density regions clusters, which we assume can be achieved by selecting objects at given normalised distance ($r/r_{rms}$, where $r_{rms}$ is an estimate halo radius) from group centre. The model predicts important out $r/r_{rms}\simeq5$. In brief, mass haloes (large dark-matter...
We study the stellar populations of bulges Milky Way-like (MW-like) galaxies with aim identifying physical processes involved in formation bulge our Galaxy. use semi-analytic model galaxy and evolution SAG adapted to this aim; kind models can trace properties their components like discs, halos, but resolution limits prevent them from reaching scale (SPs). Properties groups stars formed during single star events are stored tracked results compared observations galactic bulge. MW-like selected...