Instituto de Astronomía Teórica y Experimental

History

In the 1960s, Dr. José Luis Sérsic (argentinian scientist mainly known for his empirical law for the intensity of a galaxy called Sersic's Law) created the extragalactic astronomy department at the Observatorio Astronómico de Córdoba, where he developed his academic and research activities, forming his first disciples. In 1983, the department became the "Programa de Investigaciones en Astronomía Teórica y Experimental" (IATE), funded by CONICET, under Dr. Sérsic direction. Following the death of Dr. Sérsic on July 19, 1993, the program was discontinued. However, those graduates and PhD who were trained under his tutelage were ordered to continue with the group IATE as research group within the Observatorio Astronómico, under the leadership of Dr. Diego Garcia Lambas, one of the main disciples of Dr. Sérsic. After more than 10 years of hard work forming graduates, PhD and researchers, and to become one of the most numerous research groups within the Observatorio Astronómico, the IATE group has become one of the institutes of CONICET in 2006, with Dr. Diego Garcia Lambas being its first director. The institute then took the name of Instituto de Astronomía Teórica y Experimental, retaining the acronym IATE.

Members

At the IATE, there are 25 Ph.D in the researcher career of CONICET, 37 Ph.D and postdoctoral fellows, 9 members of the support staff career of CONICET, 1 contract staff, and 2 graduates and Ph.D working at the institute.

Scientific Areas

The lines of research are:

Galactic and Extragalactic Astronomy

The 13.8 billion years of the Universe is enough time to form giant objects, being the galaxies one of the most interesting. Galaxies are truly island universes where dark matter, billions of stars and huge amounts of gas and dust coexist in equilibrium, and yet, they are an environment suitable for the formation of new stars. Galaxies also tend to cluster in a network of cosmic proportions which highlights fabulous large structures formed by thousands of galaxies. At the IATE, the study of galaxies has been a constant challenge, which has allowed to consolidate over the years different methods for the study of the formation and evolution of galaxies. Some of the most important are:

These and other tools are used by different scientists at the IATE to perform original and reliable astronomical research.

Large Scale Structure of the Universe

The large-scale structure of the Universe is the field of cosmology that studies the distribution of the matter in the Universe on the largest scales. This field has grown remarkably since the '80s, with the development of three-dimensional maps of galaxies in several bands of the electromagnetic spectrum, and with the observation of the Cosmic Microwave Background (CMB). The increasing flow of information generated by observations has allowed to obtain reliable characterization of the content of the universe comprising

as well as its distribution. The distribution of the structures seems to follow a hierarchical model where the upper level is dominated by a network of clusters and filaments. On top of that, the universe appears to be isotropic and homogeneous in accordance with the cosmological principle. From the analysis of catalogs and the development of numerical simulations, the distribution is characterized through the implementation of different statistics that allow the study of the spatial distribution as well as the dynamics by means of the velocity field of the matter distribution.

Planetary Systems

The question of the existence of other worlds has been present in the history of mankind for centuries, but only recent scientific evidence has confirmed that planets could exist and are common outside the Solar System. Since the first discovery in 1992, over 850 new exoplanets have been cataloged. Contrary to the Solar System, exoplanets' population presents several examples of exoplanets at very small distances from its stars, highly eccentric planetary orbits, and they are frequently found in configurations not previously imagined. This led to the development of new theories and areas of research, which ultimately can help us to better understand the Solar System. Some of the projects that are currently being developed at the IATE include:

Astrophysical Plasmas

The plasma is the most common state of the baryonic matter in the Universe (99%). Most of a star, the interplanetary and interstellar medium, and the ionosphere, are plasmas. The plasma can also be generated in terrestrial laboratories for industrial applications such as producing surface coatings, precision cuts in lamps, micro-motors, and plasma reactors. A plasma is a fluid consisting of a large number of free charged particles (globally neutral and whose kinetic energy is larger than the electrostatic potential energy between them). The charges and currents that conform a plasma are sources of the electromagnetic fields and, in turn, these fields affect the distribution of charges and currents which makes its dynamics highly nonlinear and very different from that of a neutral gas. When the magnetic fields are capable of modifying an individual particle trajectory, it is said that the plasma is magnetized. The corona is highly magnetized and therefore, several structures are observed, some of which can maintain its stability for relatively long times as dark filaments on the surface of the sun. In the group of astrophysical plasmas, our scientist perform studies about the dynamic configuration and structures of the corona through the analysis of magnetic arcs and prominences, the formation of voids that remain in the plasma due to the interaction of nonlinear waves, the formation of very energetic shock wave capable of sweeping the chromosphere along a whole quadrant, etc. The team also analyse the interaction of stellar winds with the magnetosphere of exoplanets, and they model the morphology of supernova remnants affected by instabilities and the influence of the magnetic field.

Site Testing

The IATE also performs site testing for the installation of large astronomical facilities in the Argentinian territory. During the 90's (1989-1998), the IATE began the first work on astronomical site testing performing seeing measurements in the Antarctic Base Belgrano II. In 1998, measurements of seeing were performed in the Llano de Chajnantor, Atacama (Chile), as part of a project aimed at installing a liquid mercury telescope in Toco volcano. This project was not successful but the group learnt the use of the most modern technologies for measuring sky parameters. Through this experience, the IATE made contact with Dr. Marc Sarazin, of the European Southern Observatory (ESO), with whom, since the year 2000, the IATE began the searching and characterization of candidate sites to install the European Extremely Large Telescope (E-ELT), which will be finally installed in Chile, at the Cerro Armazones. During that work, a suitable candidate site was preselected at the Cordón Macón, close to Tolar Grande town. Because of its excellent conditions, the IATE decided to install observational facilities at this site, which is the most important project to date for the instrumentation team. The project also involves the development of a program committed to the educational public outreach in astronomy at the town of Tolar Grande, named Ñawi Puna.

The New Astronomical Complex

The IATE is building an astronomical complex on the Cordón Macón, located at 10 km from the town of Tolar Grande, Salta, Argentina. The site is located at latitude 24.61 South and longitude 67.32 West and at an altitude of 4,650 meters. The location has ideal conditions of humidity and air turbulence, which create almost perfect astronomical seeing. The site infrastructure will enable the development of several observational projects:

FoF meetings

Yearly, the IATE organizes the astronomical meeting named "Friends-of-Friends", usually carried out during the first fortnight of April. The meeting is aimed at stretching the bounds between the astronomers that work at the IATE and their external collaborators, as well as sharing the state-of-the-art of works that are being developed by the IATE members. The talks are split into two different modes: invited speakers present talks of 45+15 minutes, while there are several short talks of 15+5 minutes long.

^♦ This edition was organized jointly with the Observatorio Astronómico de Córdoba