We describe an SPH model for chemical enrichment and radiative cooling in cosmological simulations of structure formation. This includes: i) the delayed gas restitution from stars by means a probabilistic approach designed to reduce statistical noise and, hence, allow study inner objects with moderately high numbers particles; ii) full dependence metal production on detailed composition stellar particles using, first time codes, Qij matrix formalism that relates each nucleosynthetic product...

As traditionally cold areas become warmer due to climate change, temperature could no longer be a barrier the establishment of non-native insects. This is particularly relevant for pest insects from warm and tropical areas, mainly those with some tolerance moderately low temperatures, which expand their range into these new locations. From this perspective, in work we studied morphological biochemical responses Neotropical Paysandisia archon as part possible strategy colonize areas. To that...

We analyze and compare the bulges of a sample L* spiral galaxies in hydrodynamical simulations cosmological context, using two different codes, P-DEVA GASOLINE. The codes regulate star formation very ways, with inputing low efficiency under assumption that feedback occurs on subgrid scales, while GASOLINE have which drives large scale outflows. In all cases, marked knee-shape mass aggregation tracks, corresponding to transition from an early phase rapid assembly later slower one, separates...

In this work we present a detailed analysis of the global and fine structure four middle-mass disc galaxies obtained from hydrodynamic simulations in Λcold dark matter (ΛCDM) scenario. These objects have photometric disc-to-total ratios good agreement with those observed for late-type spirals, as well kinematic properties observational I-band Tully–Fisher relation. We identify different dynamical components at redshift zero on basis both orbital parameters binding energy stars galaxy. way,...

We analyze the qualitative behavior of scalar-tensor cosmologies with an arbitrary monotonic \ensuremath{\omega}(\ensuremath{\Phi}) function. In particular, we are interested in theories distinguishable at early epochs from general relativity (GR) but leading to predictions compatible solar-system experiments. After extending method developed by Lorentz-Petzold and Barrow, establish conditions required for convergence towards GR t\ensuremath{\rightarrow}\ensuremath{\infty}. Then, obtain all...

We present smoothed particle hydrodynamics cosmological simulations of the formation three disk galaxies with a detailed treatment chemical evolution and cooling. The resulting have properties compatible observations: relatively high disk-to-total ratios, thin stellar disks, good agreement Tully–Fisher luminosity–size relations. They break in luminosity profile at 3.0 ± 0.5 scale lengths while showing an exponential mass without any apparent breaks, which is line recent observational...

We introduce a new model for the spectral energy distribution of galaxies, GRASIL-3D, which includes careful modelling dust component interstellar medium. GRASIL-3D is an entirely based on formalism existing and widely applied spectrophotometric model, GRASIL, but specifically designed to be interfaced with galaxies any arbitrarily given geometry, such as calculated by theoretical hydrodynamical galaxy formation codes. separately treat radiative transfer in molecular clouds diffuse cirrus...

We present a detailed calculation of the light element production in framework scalar-tensor theories gravitation. The coupling function \ensuremath{\omega} is described by an appropriate form which reproduces all possible asymptotic behaviors at early times viable cosmological models with monotonic \ensuremath{\omega}(\ensuremath{\Phi}). This gives exact representation for most particular proposed literature, but also first-order approximation to many other theories. In theories, comparison...

In this paper, we analyse the conditions for convergence towards general relativity of scalar–tensor gravity theories defined by an arbitrary coupling function α (in Einstein frame). We show that, in general, evolution scalar field (φ) is governed two opposite mechanisms: attraction mechanism which tends to drive models Einstein's theory, and a repulsion has contrary effect. The dominates recent epochs universe if, only its derivative satisfy certain boundary conditions. Since these depend...

We have analysed the mass and velocity distributions of two samples relaxed elliptical-like objects (ELOs) identified, at z= 0, in a set self-consistent hydrodynamical simulations operating context concordance cosmological model. ELOs been identified as those virtual galaxies having prominent, dynamically stellar spheroidal component, with no extended discs very low gas content. Our analysis shows that they are embedded extended, massive dark matter haloes, also an corona hot diffuse gas....

view Abstract Citations (39) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Primordial Nucleosynthesis Bounds on the Brans-Dicke Theory Serna, A. ; Dominguez-Tenreiro, R. Yepes, G. A thorough calculation of light-element production in cosmologies is presented by taking into account most general class these models. The comparison outputs our with current observational data results bounds allowed omega-values. Cosmological models where phi-R...

We address the 'plane of satellites problem' by studying planar configurations around two disc galaxies with no late major mergers, formed in zoom-in hydro-simulations. Due to current lack good quality kinematic data for M31 satellites, we use only positional information. So far, analyses simulations are unable find planes as thin and populated observed ones. Moreover, they miss systematicity detail plane-searching techniques, well study properties planes, both or real data. To fill this...

view Abstract Citations (31) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Adaptive Smooth Particle Hydrodynamics and Particle-Particle Coupled Codes: Energy Entropy Conservation Serna], A. ; Alimi, J. -M. Chieze, -P. We present test a general purpose code, called PPASPR, for evolving self-gravitating fluids in astrophysics, both with without collisionless component. In PPASPH, hydrodynamical properties are computed by using the SPH...

We describe DEVA, a multistep AP3M-like-SPH code particularly designed to study galaxy formation and evolution in connection with the global cosmological model. This uses formulation of SPH equations which ensures both energy entropy conservation by including so-called $\bn h$ terms. Particular attention has also been paid angular momentum accuracy our code. find that, order avoid unphysical solutions, requires that cooling processes must be implemented non-multistep way. detail various...

Combined with other CMB experiments, the WMAP survey provides an accurate estimate of baryon density Universe. In framework standard Big Bang Nucleosynthesis (BBN), such a leads to predictions for primordial abundances $^{4}$He and D in good agreement observations. However, it also significant discrepancy between predicted observed abundance $^{7}$Li. Such is often termed as 'the lithium problem'. this paper, we analyze problem scalar-tensor theories gravity. It shown that expansion Universe...

The red palm weevil (RPW), Rhynchophorus ferrugineus, is one of the worst pests worldwide. In this work, we studied physiological basis underlying its adaptive strategy against low temperatures. Specifically, analyzed main low-molecular-weight biochemical substances acting as possible endogenous cryoprotectants, well their efficiency in reducing cold injury by preserving K+/Na+ homeostasis. Wild pre-pupae were cold-treated (5.0 ± 0.5 °C) or non-treated (23 1 for 7 days. We then determined...

We present the results of a study evolution parameters that characterize structure and dynamics relaxed elliptical-like objects (ELOs) identified at redshifts z = 0, 1, 1.5 in set hydrodynamic, self-consistent simulations operating context concordance cosmological model. The values stellar mass M, half-mass radius r, mean square velocity for stars σ have been measured each ELO found to populate, any z, flattened ellipsoid close plane (the dynamical plane, DP). Our indicate intermediate z's...

[Abridged] We have analysed the parameters characterising mass, size and velocity dispersion both at baryonic scale halo scales of two samples relaxed elliptical-like-objects (ELOs) identified, z=0, in a set self-consistent hydrodynamical simulations operating context concordance cosmological model. At they been found to satisfy virial relations; object (logarithms the) ELO stellar masses, projected half-mass radii, central l.o.s. dispersions define flattened ellipsoid close plane (the...

Abstract We use two zoom-in ΛCDM hydrodynamical simulations of massive disk galaxies to study the possible existence fixed satellite groups showing a kinematically coherent behavior across evolution (angular momentum conservation and clustering). identify three such in simulations, defining persistent planes (KPPs) that last at least from virialization z = 0 (more than 7 Gyr). This proves orbital pole clustering is not necessarily set low redshift, representing long-lived property galaxy...

We present results of an analysis the structural and kinematical properties a sample elliptical-like objects (ELOs) identified in four hydrodynamical self-consistent simulations run with DEVA code (Serna, Domínguez-Tenreiro, & Sáiz). Star formation has been implemented through simple phenomenological parameterization, which takes into account stellar physics processes only implicitly values threshold gas density, ρg, thres, efficiency parameter, c*. The operate context Λ cold dark matter...

We report on a study of the parameters characterizing mass and velocity distributions two samples relaxed elliptical-like objects (ELOs) identified, at z = 0, in set self-consistent hydrodynamical simulations operating context concordance cosmological model. Star formation (SF) has been implemented framework turbulent sequential scenario through phenomenological parameterization that takes into account stellar physics processes implicitly values threshold gas density an efficiency parameter....