Seminars
Scientific seminars exposed by scientists and technologists of the IAA and the many centers and research institutions who visit us. They show the intense scientific exchange, they are held at 12:30 every Thursday. Seminars are broadcasted live at IAA - CSIC Seminars Live.
For further information, please contact seminars (at) iaa.es.
Displaying 851 - 900 of 1219
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24/01/2003 - 13:00
H-alpha survey of low-redshift cluster galaxies: Contributions to an understanding of cluster galaxy evolution Results of an extensive H alpha survey of 8 low-redshift clusters to compare cluster and field galaxy star formation will be reviewed. It will be shown how these results indicate the importance of tidal interactions on in-falling spiral galaxies for the evolution of the cluster disk galaxy population. Chris Moss |
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15/01/2003 - 13:00
IMaX: un magnetógrafo para SUNRISE El globo estratosférico antártico SUNRISE es una colaboración entre Alemania, Estados Unidos y España y llevará a bordo un telescopio solar de nueva tecnología de C/Si C (el primario tiene 1 m de abertura y tan sólo 60 kg de peso). El telescopio lleva tres instrumentos posfocales principales: un espectropolarímetro, una cámara con un filtro universal birrefringente y un magnetógrafo. El magnetógrafo IMaX es enteramente español y basado en... José Carlos del Toro Iniesta |
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26/11/2002 - 13:00
Presente y Futuro de la Relatividad General Se revisan aspectos fundamentales de la Relatividad General y de sus aplicaciones, prestando un énfasis especial a los problemas cosmológicos actuales tanto teóricos como observacionales y, sobre todo, a la astrofísica de altas energías, en particular a aspectos presentes y futuros relativos a agujeros negros y ondas gravitatorias. El objetivo esencial de esta charla es poner de manifiesto el excelente estado de salud del que goza la relatividad... Pedro González |
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20/11/2002 - 13:00
Supervientos Galácticos Tbd Guillermo Tenorio Tagle |
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11/11/2002 - 13:00
A Cosserat Detector for Dynamic Geometry It is proposed to explore the interaction of weak gravitational fields with slender elastic materials in order to assess the viability of achieving enhanced laser interferometric sensitivities for the detection of gravitational waves with frequencies between 1e-4 and 1 Hz. The aim is the design of novel gravitational antennae in interplanetary orbit. The implementation of these ideas would be complimentary to existing programmes of gravitational... Robin Tucker |
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07/11/2002 - 13:00
Molecular outflows in high-mass star-forming regions: the extreme case of IRAS 20126+4104 As part of an outflow study in high-mass star-forming regions we observed the outflow in 20126+4104. It molecular outflow shows extremely high-velocity gas that extends in velocity more than +/- 50 km/s from the LSR. Comparing the different velocity components with the previously observed SiO jet, we found different orientation between the jet and the outflow that we interpret due to a precessing jet. The energetic of the outflow and it effects... Mayra Lebron |
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09/10/2002 - 14:00
The Legacy of the HST for Studies of Stellar Populations in the Local Group Over the past 10 years, most of the galaxies in the Local Group have been observed by the HST for the purpose of studying their stellar populations. I will present a summary of some of these observations, and describe some of the key scientific questions that have been addressed with these data. I will focus on the issue of derived star formation histories of Local Group galaxies, giving my perspective of the important issues, some of the... Prof. Jon Holtzman |
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04/10/2002 - 14:30
Modelization of the giant HII regions NGC588 and NGC595 Tbd Luc Jamet |
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04/10/2002 - 14:00
Investigating the Starburst-AGN connection Tbd Lucimara Martins |
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03/10/2002 - 14:00
The evolution of stars and gas in Starburst galaxies Tbd Roberto Cid Fernandes |
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02/10/2002 - 14:00
Dust: a solution to the temperature fluctuation problem in photoionized nebula? Tbd Grazyna Stasinska |
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01/10/2002 - 14:00
Mass accretion to supermassive blackholes in the nuclei of galaxies Tbd Thaisa Storchi-Bergmann |
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30/09/2002 - 14:00
Jet directions in AGNs Tbd Henrique Schmit |
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26/09/2002 - 14:00
Afterglows of gamma-ray bursts Ever since the first fading counterpart of Gamma Ray Burst (GRB) was discovered in 1997 there had been tremendous progress in our understanding of GRBs both in observation and theory. In this talk I will summarize the various aspects we learnt from multi-band observations of GRBs as well as the open issues. I will mention the contribution fron Indian observatories and particularly the observations I carried out at Vainu. S.G. Bhargavi |
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17/09/2002 - 14:00
Remanente de supernovas, estrellas de neutrones y el medio interestelar Tbd Gloria Dubner |
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15/07/2002 - 14:00
The feeding of monsters - a study of nearby active galaxies The understanding of the nature of AGNs and the galaxies hosting them belongs to one of the most interesting topics of modern astrophysical research. Especially the fueling mechanisms of the central black hole - supposed to be responsible for the enormous activity in these objects - raise a wealth of unanswered questions. The so called NUGA (NUclei of GAlaxies) survey an international collaboration and the Cologne Nearby QSO sample aim at... Melanie Krips |
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03/07/2002 - 14:00
Luminous Vs. dark matter in the inner parts of bright spiral galaxies The inner part of the rotation curve is crucial in determining the nature of the dark matter. The shape of the dark spherical halo is determined by the central density and the core radius. Haloes built up by hierarchical merging in dark matter cosmogonies are cusped and dominated by dark matter at the very centre. These characteristics seem to disagree with a number of observations. The number of subhaloes around typical galaxies, as identified... Isabel Pérez |
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25/06/2002 - 14:00
Everything you always wanted to know about the isolated galaxy NGC 4414 but were afraid to ask. Tbd Jonathan Braine |
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12/06/2002 - 14:00
A review of the fundamental problem of galactic dynamics The dynamics of stellars systems is fully specified by its distribution function - the phase density of its consistuent stars - and the form of the gravitational potential that binds it together. The so-called fundamental problem of galactic dynamics is the recovery of this information from the observable properties of a galaxy. I will review past results concerning this problem in the spherical and axisymmetric geometry. Finally I will show my... Anne Mathieu |
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27/05/2002 - 14:00
Evolución química en galaxias enanas esferoidales y su importancia en el medio intergaláctico del Grupo Local Se han modelado quimicamente 4 galaxias enanas esferoidales (dSph) satelites locales a partir de historias de formacion estelar obtenidas de sus diagramas HR. Se encuentran restricciones sobre la cantidad de materia oscura en estas galaxias, los tipos de vientos galacticos acontecidos y detalles de la tasa de la formacion estelar en los primeros tiempos evolutivos. Basandose en el material expulsado por el bulbo Galactico y por las galaxias... Leticia Carigi |
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24/05/2002 - 14:00
Star formation, gas cycles and the chemical evolution of dwarf irregular galaxies Because of their low gravitational energies dwarf galaxies are greatly exposed to energetical influences from internal and external sources. In gas-rich dwarf irregular galaxies not only that star formation regulates itself due to the stellar energy release, but also supernova-driven galactic winds are accepted as a general explanation for their low metallicities. Chemodynamical models of dIrrs that take the dynamics of different gas phases and... Gerhard Hensler |
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17/05/2002 - 14:00
Hipparcos y la población estelar temprana de la vecindad solar: Estructura vertical galáctica, la burbuja local y extinciones masivas. The availability of Hipparcos data has revolutionized astrometry. The impact has been felt more strongly in those fields where there is a significant number of objects within 200 pc, which corresponds to the maximum distance at which individual Hipparcos parallaxes can be considered accurate. However, objects located further away can still be analyzed with Hipparcos when one considers the measurements in a statistical sense. Here I discuss some... Jesús Maíz Apellániz |
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14/05/2002 - 14:00
La compleja vida de las galaxias elípticas We present a simple phenomenological model of feedback in early-type galaxies that tracks the evolution of the gas content, metallicity and temperature. Modeling the star formation rate as a Schmidt law with a temperature-dependent efficiency, we find that intermittent episodes of star formation are common in moderate-size ellipticals. This departure from a standard scenario of passive evolution implies significantly younger luminosity-weighted... Ignacio Ferreras |
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10/05/2002 - 14:00
Gas molecular y formación estelar en galaxias enanas de marea Tidal Dwarf Galaxies (TDGs) are created during a violent interaction of galaxies containing at least one spiral. Atomic hydrogen is torn off a spiral and star formation takes place in this gas which accumulates at the ends of tidal tails. TDGs typically contain two main stellar components: young stars recently formed by collapse of expelled HI clouds, and an older stellar population, at least 1 Gyr old, which was pulled out from the disk of the... Ute Lisenfeld |
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25/04/2002 - 14:00
Nuclear star clusters in late-type spirals I will summarize the results of our recently completed HST/WFPC2 I-band survey of a sample of 77 nearby, late-type spiral galaxies with low inclination. The main purpose of this catalog is to study the frequency and properties of nuclear star clusters in this class of galaxies. We find that at least 75% of late-type spirals harbor a distinct, compact (but resolved), and dominant star cluster at their photocenter. From an isophotal analysis, we... Torsten Boeker |
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24/04/2002 - 14:00
New results from Plateau de Bure Tbd Michel Guelin |
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17/04/2002 - 14:00
Solar Terrestrial Physics Laboratory at CRESS, York University, Canada Tbd Stoyan Sargoytchev |
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16/04/2002 - 14:00
La calibración de ALMA: Efectos atmosféricos, su modelización, medida y estrategias de corrección El proyecto ALMA exigirá grandes esfuerzos tanto en el dominio técnico como en el de la modelización que deberá simular o tratar ciertos efectos. Uno de los problemas a abordar es el de los efectos atmosféricos sobre las observaciones: atenuación, contribución a la temperatura de sistema, fluctuaciones de la fase... Disponer de un modelo lo más preciso posible de dichos efectos atmosféricos y trabajar sobre las estrategias más convenientes para... Juan Ramón Pardo |
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02/04/2002 - 14:00
Dwarf Galaxies: the building blocks of the Milky Way? In hierarchical clustering scenarios of galaxy formation, such as cold dark matter-dominated cosmologies (White and Rees 1978), dwarf galaxies should have formed prior to the epoch of giant galaxy formation and would be the building blocks of larger galaxies. The picture of building the Galactic halo from merging ``fragments'', which Searle and Zinn (1978) proposed on the basis of the properties of the Milky Way globular clusters, is regarded as... David Martínez Delgado |
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20/03/2002 - 13:00
Astronomy in Egypt Tbd Anas Osman |
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13/03/2002 - 13:00
La evolución del He4 y del Helio primordial En esta charla voy a revisar la evolución del 4He en el Universo, con un énfasis particular en la determinación de la abundancia de Helio primordial Y_P y sus implicaciones cosmológicas. Discutiré las determinaciones más recientes de Y_P, y las incertidumbres que las afectan. Valentina Luridiana |
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04/03/2002 - 13:00
Proyecto ALMA Tbd José Cernicharo |
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29/01/2002 - 13:00
Los cometas y el agua terrestre Resultados de observaciones cometarias recientes han estimulado varias hipotesis nuevas sobre el origen de la materia volatil terrestre, incluyendo el agua, moleculas organicas y gases nobles. Se ha sugerido (por ejemplo, Owen and Bar-Nun 1995 y 2000, Delsemme 1999) que los cometas son la fuente principal del agua y de las primeras moleculas organicas terrestres. Por otro lado, Swindle y Kring (2001) se basan en la abundacia de Argon observada... Humberto Campins |
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15/01/2002 - 13:00
Estrellas, emisión multirango y estadística: hacia una nueva generación de modelos de síntesis Los modelos de sintesis evolutiva son una herramienta que se aplica para determinar las propiedades fisicas de un amplico rango de objetos, desde cumulos estelares a galaxias a distancias cosmologicas. Su principal ventaja es la capacidad de obtener las propiedades promedio de sistemas estelares en funcion de cierto numero de parametros y la capacidad de comprobar nuestro conocimiento sobre la teoria de evolucion estelar mediante la comparacion... Miguel Cerviño Saavedra |
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09/01/2002 - 13:00
El gas más caliente en nebulosas planetarias: revelaciones en rayos X y UV Las nebulosas planetarias son el resultado de la evolucion de estrellas de masa baja e intermedia. El modelo mas aceptado para explicar la formacion de las nebulosas planetarias es el de la interaccion entre el viento estelar rapido y tenue que emana de la estrella central con el viento lento y denso que se eyecto en fases anteriores de la evolucion estelar. Una de las predicciones basicas de este modelo es que el viento estelar en el interior... Martin A. Guerrero |
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18/12/2001 - 13:00
The Martian atmospheric evolution: implications for the planetary water inventory The study of Mars and its planetary water inventory is particularly interesting because this planet is similar to Earth in many ways. Observations by various spacecraft in the past and more recently by Mars Global Surveyor showed the probable existence, at least in the past, of large quantities of liquid water on the Martian surface or in subsurface layers. Surface features resembling massive outflow channels provide evidence that the Martian... Helmut Lammer |
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17/12/2001 - 13:00
Searching for signatures of life on extra-solar plantes The direct detection of terrestrial extra-solar planned should be possible in the next 10 or 20 years. It is the main purpose of two space missions: Darwin (ESA) and TPF (NASA). Moreover, assuming a detection of such a planet, these telescopes should also be able to perform low-resolution spectra of this new world and therefore to infer the presence of atmospheric compounds. I will discuss the exobiological implications of these extrasolar... Franck Selsis |
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22/11/2001 - 13:00
Cúmulos estelares en regiones de HII extragalácticas This talk deals with properties of very young (< 10-20 Myr) stellar clusters which are in the nebular phase and are embedded in photoionized regions (classical extragalactic HII regions (RHIIs) or starburst galaxies). Based on the analysis of the integrated light of these clusters at the UV and optical wavelengths, different techniques are discussed that allow to estimate in consistent the stellar content and the evolutionary state of the... Rosa González Delgado |
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16/11/2001 - 13:00
The Rayleigh ellipsoid approximation. A poor man's approach to the extinction of electrogmanetic radiation by small particles. Tbd Andrzej Jurewicz |
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14/11/2001 - 13:00
Non-adiabatic eigenfunctions in the atmosphere of pulsation stars: a tool for better mode identification. In this seminar, an overview of the utility of studying non-radial non-adiabatic oscillations of stars such as $\delta$ Scuti, $\beta$ Cephei and Slowly Pulsating B stars will be given, with a particular attention on the problem of mode identification. Then I will present in more details the particularities of the non-adiabatic code I have written, which is mainly the special care given to the modelling of the pulsation in the atmosphere. Antoine Dupret |
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07/11/2001 - 13:00
Enigmática expulsión esférica de materia en un embrión estelar. ALMA, una gran espectativa. Tbd José María Torrelles Arnedo |
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06/11/2001 - 13:00
The Hamburg/SAO survey for low metallicity BCGs (HSS-LM) The description and the first results of the new project will be presented. It is devoted to the search for the most metal-deficient blue compact galaxies. The first goal is to extend the sample of the most interesting candidates to truly young galaxies in the local Universe, and study them in detail. The second goal of the project is to create a large, clearly selected sample of BCGs with reliably measured O/H. The data will be used for the... Simon Pustilnik |
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24/10/2001 - 14:00
Acreción y pérdida de masa cerca del límite subestelar LS-RCrA 1 es una estrella de tipo espectral muy tardío (M6.5-M7) cuyo espectro muestra líneas de emisión muy intensas, tanto prohibidas como permitidas. La estrella parece encontrarse en una región de formación estelar, lo que explicaría la presencia de las líneas, pero su posición en el diagrama HR, teniendo en cuenta las trazas evolutivas calculadas para estrellas de muy baja masa, difiere de la esperada. Matilde Fernández |
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02/10/2001 - 14:00
The evolution of galaxies in different cosmological environment According to the hierarchical scenario, galaxies form via merging and accretion of small objects. Within a series of high resolution simulations we have studied the formation and evolution of dark matter halos hosting galaxies. First halos have been formed at z > 10. We have studied the evolution of isolated halos (field galaxies) as well as of halos in dense regions (galaxies in groups or clusters and galaxies with satellites) and of small... Stefan Gottloeber |
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26/09/2001 - 14:00
Perspectivas científicas con VLBI a longitudes de onda milimétricas Tbd Antxon Alberdi |
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12/09/2001 - 14:00
Interacción de meteoroides con las atmóferas de Marte y Titán Tbd Gregorio Molina |
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04/07/2001 - 14:00
El instrumento OSIRIS de la misión Rosetta Tbd Rafael Rodrigo |
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28/06/2001 - 14:00
The problem of stability of internal spaces in multidimensional cosmology We investigate effective 4-dimensional theories which were obtained under dimensional reduction of multidimensional cosmological models. We show that for warped product spacetimes the conformal (geometrical moduli) excitations of the internal spaces should be observable as massive scalar fields in the external (our) spacetime. These scalar fields (gravitational excitons) describe weakly interacting particles and can be considered as dark matter... Prof. Alexander Zhuk |
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27/06/2001 - 14:00
High-Energy Emission from Relativistic Jets in Blazars We have been observing a number of blazars with the Very Long Baseline Array in concert with monitoring at other wavebands, including X-rays and gamma-rays. Observations over several years demonstrate that there is an intimate connection between the ejection of apparent superluminal knots in the relativistic jets and X-ray or gamma-ray flares in blazars. The high-energy emission tends to be simultaneous with or even to follow the radio event,... Prof. Alan Marscher |
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26/06/2001 - 14:00
Some aspects of the upper atmosphere of Mars: ionosphere, airglow, meteors. The comparative study of the planetary atmospheres is a young and interesting science, because of the diversity of the situations. As part of this programme, the exploration of Mars is very challenging. This talk concerns more particularly the modeling of the Martian ionosphere, in the context of the future missions to Mars (Mars-Express, Nozomi, Netlander, Mars 2007). The ionospheric model is based on a terrestrial coupled kinetic and fluid... Olivier Witasse |