The evidence for jet-cloud interactions in a sample of high/intermediate-redshift radio galaxies

We present the result obtained from a study, based on long-slit spectroscopy, of the kinematics and ionization mechanisms of the line-emitting gas for a sample of four high/intermediate-redshift radio galaxies. In two of the galaxies (3C352 and 3C435A) the radio sources are of the same scale as the emission-line regions, whereas in the other two (3C34 and 3C330) the radio sources are extended on a larger scale than the emission-line structures. We see evidence for shock-acceleration of the emission-line gas in the extended regions of all the galaxies, even in the largest radio sources of our sample, in which the radio hot spots have passed the extended gas of the galaxies. The extended regions present highly disturbed kinematics (line-splitting and/or underlying broad components), which are difficult to explain if we do not consider a strong interaction between the radio-emitting components and the ambient gas. However, the dominant ionization mechanism of the line-emitting gas remains uncertain. We have compared the optical diagnostic line ratios of the galaxies in our sample with both AGN-photoionization and shock-ionization models. We find a lack of consistency in explaining the main ionization mechanism of the emission-line gas. This suggest that, if the extended regions are shock-ionized, some of the assumptions implicit in the shock models may need to be reconsidered. In addition, we have investigated the nebular continuum cointribution to the UV excess in the galaxies of our sample. We find a substantial nebular emission contribution to the UV continuum in all the cases. However, after the subtraction iof the nebular component, a significant UV excess remains in the extended nebulae of most of the objects.Comment: 33 pages, 24 figures, accepted for publication in MNRAS. (Abstract shortened for astro-ph

INTEGRAL spectroscopy of three powerful radio galaxies: Jet-cloud interactions seen in 3-D

Integral-field spectroscopic observations are presented for three powerful radio galaxies, namely 3C277.3 (Coma A; z=0.0857), 3C171 (z=0.2384) and 3C265 (z=0.811), which are known to be undergoing jet-cloud interactions. The morphology, kinematics and ionization of the gas in the emission-line structure of these sources are mapped and analysed. One-dimensional spectra are also extracted and integrated over the different emission-line regions in each galaxy. In two of the galaxies (3C277.3 and 3C171) the radio sizes are of similar extent to the emission-line structure. For these, enhanced emission-line regions are found associated with the radio structures, in addition to complex kinematics and low ionization states close to the radio hotspots, indicating that jet-induced shocks disturb and ionize the gas. Interestingly, the bright -- presumably shock-ionized -- emission-line region coincident with the radio jet knot in 3C277.3 shows quiescent kinematics and high ionization state. Possible explanations for this puzzling result are proposed. The images of 3C171 and 3C265 indicate that the lateral expansion of the cocoon has a significant effect on the kinematics and ionization of the gas, showing for the first time that the effects of the radio source are felt far from the jet axis. In addition, the presence of a stellar-photoionized HII region is detected in the extended emission-line nebula of the radio galaxy 3C277.3.Comment: 19 pages, including 16 figures (4 in colour), MNRAS accepte

Numerical simulation of slurry flows in heterogeneous and saltation regimes in horizontal pipelines

In this work, the simulation of a two-phase liquid-particles flow is performed using an Eulerian- Eulerian model to predict the complex flow behavior where both particle concentration and particle velocity profile are shown and compared with experimental data. One of the main concerns during implementation of pipeline transportation of multiphase mixtures the is assurance of the flow, where the formation of particle fixed beds should be strongly avoided due to its disadvantageous and damaging effects on the flow, which mostly occur at the bottom sides of the pipeline walls

CFD study of an oil catch can

Oil catch cans are devices used in some internal combustion engines to prevent oil droplets from entering into the exhaust manifold of the engine. The main purpose of this paper is to study the design of a typical oil catch can used in regular vehicles and analyze the effects caused by varying the length of its inner tube and the relative position of the outlet: either radial or tangential to the can body

Numerical simulation of slurry flows in heterogeneous and saltation regimes in horizontal pipelines

In this work, the simulation of a two-phase liquid-particles flow is performed using an Eulerian- Eulerian model to predict the complex flow behavior where both particle concentration and particle velocity profile are shown and compared with experimental data. One of the main concerns during implementation of pipeline transportation of multiphase mixtures the is assurance of the flow, where the formation of particle fixed beds should be strongly avoided due to its disadvantageous and damaging effects on the flow, which mostly occur at the bottom sides of the pipeline walls

Modeling and optimazation of energetic system in a hybrid smart house

The project objectives are to model the energetic configuration of a Smart House in a numerical platform (e.g., HOMER Energy™ software), to validate the numerical predictions of technical performance with experimental facilities at NU-Technopark and to predict the optimal energetic configuration of the Smart House. This case study will be implemented particularly in Astana, but once the model is validated, configurations can be obtained for other cities with a small extra modeling effort

Modeling and optimazation of energetic system in a hybrid smart house

The project objectives are to model the energetic configuration of a Smart House in a numerical platform (e.g., HOMER Energy™ software), to validate the numerical predictions of technical performance with experimental facilities at NU-Technopark and to predict the optimal energetic configuration of the Smart House. This case study will be implemented particularly in Astana, but once the model is validated, configurations can be obtained for other cities with a small extra modeling effort

First results of the ROSEBUD Dark Matter experiment

Rare Objects SEarch with Bolometers UndergrounD) is an experiment which attempts to detect low mass Weak Interacting Massive Particles (WIMPs) through their elastic scattering off Al and O nuclei. It consists of three small sapphire bolometers (of a total mass of 100 g) with NTD-Ge sensors in a dilution refrigerator operating at 20 mK in the Canfranc Underground Laboratory. We report in this paper the results of several runs (of about 10 days each) with successively improved energy thresholds, and the progressive background reduction obtained by improvement of the radiopurity of the components and subsequent modifications in the experimental assembly, including the addition of old lead shields. Mid-term plans and perspectives of the experiment are also presented.Comment: 14 pages, 8 figures, submitted to Astroparticle Physic