Eventos

Fractal and multi-fractal properties have been found both in fluid mechanics and geophysical related geometrical objects, as the convective boundary layer of cumulus cloud fields, ripple-wave turbulence, topographic and river networks patterns, solar granulation patterns, and in observational ast

The discrepancy between chemical abundances computed using optical recombination lines (ORLs) and collisionally excited lines (CELs) is a major unresolved problem in nebular astrophysics, with significant implications for the determination of chemical abundances throughout the Universe.

The idea of detecting gravitational waves from space has been under consideration for more than 25 years. In 2012, the advisory bodies of ESA decided that the next-but-one "large mission", L3, will be devoted to this. Launch is scheduled for 2034.

Alone amongst the space agencies, ESA made its entry into space astrometry with the adoption of the Hipparcos mission in 1981. Outside of the astrometric community, it was viewed at the time as fundamental if not particularly exciting, although Freeman Dyson described it as "...

It is well known that there is little star formation activity in early-type galaxies. By cross-matching SDSS DR 7 with RC3 catalog and visually checking the SDSS images, we derive a sample of 583 S0 galaxies with the central spectrophotometric information.

Supermassive black holes, weighing between millions to billions times the mass of the Sun, are believed to power quasars and other energetic activity in the centers of galaxies.  With the help of advanced telescopes from the ground and in space, operating across the electromagnetic spectrum, astr

Future galaxy surveys of the large-scale structure in the Universe will provide a wealth of new data and make it possible to use higher-order statistics beyond the power spectrum, such as the bispectrum (or 3-point correlation function), to constrain galaxy clustering, the standard LCDM cosmology

The HI galaxy mass function represents a fundamental component of our understanding of the gas content of galaxies. How its form varies throughout the local Universe and as a function of redshift is key to developing a complete picture of galaxy evolution.

Esta charla pretende dar una visión general del estado actual del observatorio de Calar Alto mostrando los principales hitos conseguidos en los últimos años.

Metal-poor, star-forming, dwarf galaxies play a fundamental role in galaxy formation and evolution, and according to LambdaCDM models may be the building blocks of most of the galaxies in the universe today.

Magnetic reconnection is a fundamental plasma process that permits the exchange of energy and mass between colliding plasmas, e.g., between the Solar Wind and the Earth's magnetosphere.

Superthin galaxies are bulgeless, late-type spiral galaxies seen edge-on.  HI synthesis observations probe the kinematic structure of their interstellar medium.  Observations of these isolated, quiescent galaxies have reached column densities as low as few x 1018 atoms .

Primitive extraterrestrial materials, such as meteorites and dust collected by sample return missions, are characterized by a large compositional heterogeneity at different scales. This heterogeneity has been observed in the laboratory by different techniques.

The abundance of Lithium observed in very young stellar populations is ~ 4 times larger than the primordial one estimated by recent Planck measurements.

Planetary nebulae are one of the last stages of evolution of stars like our Sun. The beginning of photoionization, giving rise to a new planetary nebula, will certainly produce dramatic changes in the object, but this instant is difficult to observe, since it will only take a few decades.

Es conocido que el Sol presenta un ciclo de once años, a lo largo del cual su actividad magnética (que se manifiesta en forma de manchas, explosiones que liberan energía y eyecciones de materia al espacio interplanetario) oscila desde un mínimo hasta un máximo.

Nuclear activity as is observed in active galactic nuclei (AGN) might be a phase occurring in all galaxies, and this activity could be recurrent. A perfect laboratory to test these scenarios are the giant radio galaxies, since their emission can be as old as 10⁷-10⁸ years.

The main goal of this talk is to promote Big Data at the IAA.

A brief description of the Big Data problem is presented and how to solve it, minimizing the technical details, reviewing previous work at IAA and showing a practical case demonstration.

Active  galactic  nuclei  (AGN)  show  a  great  diversity  of  optical  and  UV  emission  line properties. Dynamical  and  physical  models should  be built  accordingly.

Only around 60 AGNs have been detected so far at Very High Energy (VHE, E>100 GeV) gamma rays, most of them being blazars (AGNs which relativistic jet point in the direction to the Earth).

The environment of Sgr A* provides a window to the close-up study of star formation under extreme physical conditions.

In the last decade, large surveys drawn a detailed picture of fundamental properties of galaxies increasing our understanding of the formation and evolution of galaxies.

Space VLBI observations with RadioAstron provide an extraordinary improvement of angular resolution. In this talk, I will present the results obtained from RadioAstron imaging of the relativistic jet in the quasar 0836+710 at L, C, and K bands.

I shall comment on the difficulties faced today by the so called "Unified Model" (UM) for AGN. According to this model,  type1 and type 2 AGN are the same except for a combined effect of orientation and obscuration in the line of sight.

The first phases of galaxy formation and evolution remain poorly understood and improved observational constraints are needed to test the theoretical picture and simulations.