Tomography of high-redshift clusters with OSIRIS

High-redshift clusters of galaxies are amongst the largest cosmic structures. Their properties and evolution are key ingredients to our understanding of cosmology: to study the growth of structure from the inhomogeneities of the cosmic microwave background; the processes of galaxy formation, evolution, and differentiation; and to measure the cosmological parameters (through their interaction with the geometry of the universe, the age estimates of their component galaxies, or the measurement of the amount of matter locked in their potential wells). However, not much is yet known about the properties of clusters at redshifts of cosmological interest. We propose here a radically new method to study large samples of cluster galaxies using microslits to perform spectroscopy of huge numbers of objects in single fields in a narrow spectral range-chosen to fit an emission line at the cluster redshift. Our objective is to obtain spectroscopy in a very restricted wavelength range (~100 A in width) of several thousands of objects for each single 8x8 square arcmin field. Approximately 100 of them will be identified as cluster emission-line objects and will yield basic measurements of the dynamics and the star formation in the cluster (that figure applies to a cluster at z~0.50, and becomes ~40 and ~20 for clusters at z~0.75 and z~1.00 respectively). This is a pioneering approach that, once proven, will be followed in combination with photometric redshift techniques and applied to other astrophysical problems.Comment: 4 pages, 3 figures. Proceedings of "Science with the GTC", Granada (Spain), February 2002, RMxAA in pres

Electron and Phonon Temperature Relaxation in Semiconductors Excited by Thermal Pulse

Electron and phonon transient temperatures are analyzed in the case of nondegenerate semiconductors. An analytical solution is obtained for rectangular laser pulse absorption. It is shown that thermal diffusion is the main energy relaxation mechanism in the phonon subsystem. The mechanism depends on the correlation between the sample length and the electron cooling length in an electron subsystem. Energy relaxation occurs by means of the electron thermal diffusion in thin samples (), and by means of the electron-phonon energy interaction in thick samples (). Characteristic relaxation times are obtained for all the cases, and analysis of these times is made. Electron and phonon temperature distributions in short and long samples are qualitatively and quantitatively analyzed for different correlations between the laser pulse duration and characteristic times.Comment: 33 pages, 16 figure

A not so massive cluster hosting a very massive star

We present the first physical characterization of the young open cluster VVV CL041. We spectroscopically observed the cluster main-sequence stellar population and a very-massive star candidate: WR62-2. CMFGEN modeling to our near-infrared spectra indicates that WR62-2 is a very luminous (10$^{6.4\pm0.2} L_{\odot}$) and massive ($\sim80 M_{\odot}$) star.Comment: 1 page, 1 figure, to be published in the "International Workshop on Wolf-Rayet Stars conference proceedings" by Universit\"atsverlag Potsdam (editors: W.-R. Hamann, A. Sander, and H. Todt

Flux-cutting and flux-transport effects in type-II superconductor slabs in a parallel rotating magnetic field

The magnetic response of irreversible type-II superconductor slabs subjected to in-plane rotating magnetic field is investigated by applying the circular, elliptic, extended-elliptic, and rectangular flux-line-cutting critical-state models. Specifically, the models have been applied to explain experiments on a PbBi rotating disk in a fixed magnetic field ${\bm H}_a$, parallel to the flat surfaces. Here, we have exploited the equivalency of the experimental situation with that of a fixed disk under the action of a parallel magnetic field, rotating in the opposite sense. The effect of both the magnitude $H_a$ of the applied magnetic field and its angle of rotation $\alpha_s$ upon the magnetization of the superconductor sample is analyzed. When $H_a$ is smaller than the penetration field $H_P$, the magnetization components, parallel and perpendicular to ${\bm H_a}$, oscillate with increasing the rotation angle. On the other hand, if the magnitude of the applied field, $H_a$, is larger than $H_P$, both magnetization components become constant functions of $\alpha_s$ at large rotation angles. The evolution of the magnetic induction profiles inside the superconductor is also studied.Comment: 12 pages, 29 figure

Blue outliers among intermediate redshift quasars

[Oiii]{\lambda}{\lambda}4959,5007 "blue outliers" -- that are suggestive of outflows in the narrow line region of quasars -- appear to be much more common at intermediate z (high luminosity) than at low z. About 40% of quasars in a Hamburg ESO intermediate-z sample of 52 sources qualify as blue outliers (i.e., quasars with [OIII] {\lambda}{\lambda}4959,5007 lines showing large systematic blueshifts with respect to rest frame). We discuss major findings on what has become an intriguing field in active galactic nuclei research and stress the relevance of blue outliers to feedback and host galaxy evolution.Comment: Accepted for publication in Astrophysics and Space Science, Special Issue on Line Shifts in Astrophysics and Laboratory Plasm

Anger and hardy personality in racket and endurance sportsman

Los objetivos del presente trabajo de investigación fueron, conocer cuáles son las diferencias en los niveles de personalidad resistente en función del tipo de deporte (raqueta o resistencia) y comprobar cuáles son las diferencias en los niveles de ira en función del tipo de deporte (raqueta o resistencia). La muestra total se compuso de 121 deportistas, de los cuales 58 practican deportes de resistencia y 63 deportes de raqueta. Se utilizó un cuestionario sociodemográfico ad hoc, la Escala de Personalidad Resistente en Maratonianos (EPRM), el Inventario de Expresión de la Ira Estado-Rasgo STAXI-2 y la escala de Oviedo de Infrecuencia de Respuesta (INF-OV). Los resultados mostraron diferencias significativas en el control y compromiso en favor de los deportistas de resistencia. A su vez, el control se relacionó con el deporte de resistencia. Por otro lado, los deportistas de raqueta presentaron más expresión interna de la ira y la expresión interna de la ira se relacionó con la práctica de deporte de raqueta. Se concluyó que los deportistas de resistencia presentan mayores niveles de control y compromiso que los deportistas de raqueta. Además, los deportistas de resistencia obtuvieron menores niveles de expresión interna de la ira que los deportistas de raqueta

Parental education styles as a predictor of sport success and competition level

Los objetivos de este trabajo fueron comprobar cuáles son las diferencias en el nivel de competición deportivo en función de los estilos educativos de los padres, y conocer cuáles son las diferencias en los éxitos deportivos en función de los estilos educativos de los padres. Se administró un Cuestionario Sociodemográfico ad hoc, el Test Autoevaluativo Multifactorial de Adaptación Infantil (TAMAI) y la Escala de Oviedo de Infrecuencia de Respuesta (INF-OV). La muestra se compuso de 502 deportistas españoles. Los resultados mostraron que los deportistas sin éxitos internacionales obtuvieron diferencias significativas y mayores puntuaciones de restricción de la madre. Por otro lado, la educación asistencial próxima al proteccionismo de la madre obtuvo diferencias significativas y mayores puntuaciones en los deportistas que no compiten a nivel internacional. Se concluyó que las madres protectoras no se relacionan con tener hijos que compiten a nivel internacional y las madres restrictivas no se relacionan con tener hijos con éxitos a nivel internacionalThe objectives of this research were to check the differences in the level of sport competition depending on parental education styles, and to know what the differences are in parental education styles in terms of sport success. In order to measure the different variables an ad hoc sociodemographic questionnaire, the Multifactor Self-Assessment Test of Child Adjustment (TAMAI) and the Oviedo Scale of Infrequency of Response (INF-OV) were carried out. The sample consisted of 502 Spanish athletes. The results showed that athletes without international success obtained higher scores and significant differences in mother´s restriction. Moreover, the mother’s care education close to protectionism showed significant differences in benefit of athletes who do not compete internationally. It was concluded that protective mothers are not related to having children who compete internationally and restrictive mothers are not related to having children who achieve international succes