Seminarios
Seminarios científicos impartidos por científicos y tecnólogos del IAA y de los muchos centros e instituciones de investigación que nos visitan. Muestra del intenso intercambio científico, se celebra a las 12:30 de cada jueves. Los seminarios se retransmiten en directo en IAA - CSIC Seminars Live.
Instrucciones
Para más información contactar con seminars (at) iaa.es.
851 - 900 de un total de 1243
Pages
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10/11/2003 - 13:00
Expulsiones isotrópicas de gas en objetos jóvenes: Un reto para las teorías sobre formación estelar Un equipo de investigadores pertenecientes al IAA, ICE, LAEFF, UGR, CfA, UNAM y U.Chile hemos descubierto dos objetos jóvenes muy peculiares en la región de formación estelar W75. Estos dos objetos, están separados por sólo 0.7" (1400 Unidades Astronómicas), comparten el mismo núcleo molecular del cual se han formado, tienen un tipo espectral parecido (estrellas tipo B), pero muestran expulsiones de gas con una geometría espacial... José María Torrelles Arnedo ICE(CSIC)-IEEC |
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05/11/2003 - 13:00
Astronomy in Ukraine: science and education In this talk I will present the status of the professional astronomy in Ukraine. The main astronomical observatories of Ukraine (equipments, deparments and corresponding science programmes) will be presented as well as the level of astronomical education in the country (structure and amateur astronomy). Sergei Guziy Instituto de Astrofísica de Andalucía - CSIC & Astronomical Observatory, University of Nikolaev, Ucrania |
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28/10/2003 - 13:00
Problemas típicos de transporte radiativo: método integral implícito Parto de la sensación - que no se cómo he llegado a tenerla, pero de la que me siento totalmente responsable - que al menos para los problemas de transporte radiativo (y creo que en todas las ramas del Cálculo Numérico), la llegada del "Ordenador" ha sido considerada nada más que como una mejora en los útiles de trabajo sin reconocer la posibilidad de que el citado "Ordenador" aporta también nuevos y muy interesantes métodos... Eduardo Simonneau Institut d'Astrophysique de Paris (CNRS), Francia |
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16/10/2003 - 14:00
Differential rotation in intermediate mass stars Rotation constitutes an important element to take into account when modelling A type and hotter Main Sequence stars. Nowadays, despite the progress made in the treatment of rotation, it remains a significant problem for the analysis of observations from this kind of stars. One of the main problems connected to rotation is the transport of angular momentum in stellar interiors. In this work, I am interested in the study of differential rotation... Juan Carlos Suárez Yanes Instituto de Astrofísica de Andalucía - CSIC |
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08/10/2003 - 14:00
Nebulosas gigantes asociadas con radio galaxias lejanas Nuestro trabajo reciente basado en espectros ópticos obtenidos con los telescopios KeckII y VLT, muestra que las radio galaxias lejanas (z>~2) están asociadas con enormes reservas gaseosas que se extienden a menudo >~100 kpc. Estas estructuras, desconocidas hasta ahora, presentan una cinemática relajada consistente con movimientos gravitatorios, quizás rotación. Proponemos que ésta es la acumulación de gas a partir de la cual la galaxia... Montserrat Villar Martín Instituto de Astrofísica de Andalucía - CSIC |
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01/10/2003 - 14:00
Lyman alpha emission from starburst galaxies The Lyman alpha line from starburst galaxies presents a variety of profiles that can be understood within the frame-work of massive feedback from star formation. I shall review the observational evidence for different line profiles emanating from galaxies in the nearby Universe and link these to the various stages of the evolution of superbubbles generated by massive stellar clusters. The application to galaxies at large redshift is also... Guillermo Tenorio-Tagle INAOE, Mejico |
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23/09/2003 - 14:00
Eigenvector 1 Parameter Space: An H-R Diagram for the Quasars? How does one go about finding an H-R Diagram for Quasars? Does it make any sense to search for one? We will review the evidence for phenomenological diversity among the broad-line emitting AGN that highlights the need for such a diagram. In other words, all quasars are not alike. We will then introduce a 4D parameter space that we call Eigenvector 1 which appears to provide optimal phenomenological discrimination between the major classes of AGN... J.W. Sulentic Physics and Astronomy, Univ. of Alabama, USA |
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17/09/2003 - 14:00
Nubes moleculares oscuras 'iluminadas' por objetos Herbig-Haro La fuerte radiación generada por los objetos HH impregna las nubes moleculares en las cuáles están embebidas, alterando significativamente la composición química de las regiones más cercanas a estos objetos. El estudio de estas regiones "iluminadas" por los objetos HH no sólo nos permite conocer cuáles son sus propiedades químicas y físicas, sino que también nos proporciona información valiosa de las nubes moleculares oscuras.... J.M. Girart Depto. de Astronomía y Meteorología, Univ. de Barcelona |
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01/07/2003 - 14:00
Probing quantum gravity: Experimental tests of Lorentz and CPT symmetries I review briefly theoretical reasons for possible violations of Lorentz and/or CPT symmetries in some models of quantum gravity. I then proceed to describe experimental tests, ranging from sensitive probes of quantum mechanics, like neutral kaons, and precision measurements in nuclear and atomic physics (clock comparison experiments) and antimatter factories (such as antihydrogen production at CERN), to astrophysical tests (gamma ray bursts etc... N. Mavromatos King's College, Londres, UK |
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11/06/2003 - 14:00
Radio emission from supernovae Observations of recently exploded radio supernovae -a few years to a few tens of years- allow us to obtain valuable information about the nature and evolutionary phase of the progenitor star in the period from a few hundred to several tens-of-thousands of years before its explosion. In particular, high resolution radio observations using very-long-baseline interferometry (VLBI) are the only ones that permit to trace the presupernova mass loss... Miguel Ángel Pérez Torres Instituto de Astrofísica de Andalucía - CSIC |
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05/06/2003 - 14:00
Poincaré-gauged theory of gravity: new aspects Tbd Prof. Boris N. Frolov Depto. de Matemáticas de la Univ. Estatal Pedagógica de Moscú, Rusia |
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23/05/2003 - 14:00
ACS observations of Abell 1689 A1689 is one of the most powerful gravitational lenses in the sky. In June 2002 we observed the center of A1689 with the ACS WFC for 20 orbits in the g,r,i,z bands, plus 3 orbits of grism observations. The resulting images are close to the depth of the HDFN over an area of 3.4'x3.4'. Combined with the magnification from the cluster, this offers an unprecedented view of the high redshift universe. The multicolor coverage, complemented with... Narciso Benítez John Hopkins University, Baltimore, MD, USA |
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19/05/2003 - 14:00
Physical conditions in luminous AGN The phenomenon of active galactic nuclei (AGN) has been one of the most intriguing subjects of astrophysical studies in the past several decades. Radio astronomy and very long baseline interferometry (VLBI) have played a crucial role in these studies, particularly in investigations of reltavistic outflows (jets) commonly observed in luminous AGN. For the past 30 years, radio interferometry has yielded an impressive amount of information about... A.P. Lobanov Max-Planck Institute fuer Radioastronomie, Bonn, Alemania |
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16/05/2003 - 14:00
La primera luz de LIRIS Tbd Arturo Manchado Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife |
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14/05/2003 - 14:00
El escenario de acreción en la formación de estrellas masivas Actualmente hay un gran debate acerca de como ocurre la formación de una estrella masiva. Algunos autores creen que debe ser por colisió de estrellas de baja masa formadas previamente, mientras que otros creen que ocurre mediante un proceso de acreció muy similar al de las estrellas de baja masa. Debido a la dificultad de observar protoestrellas masivas no es fácil favorecer uno u otro escenario. Sin embargo, el descubrimiento de los llamados... Mayra Osorio Instituto de Astrofísica de Andalucía - CSIC |
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30/04/2003 - 14:00
A Study of circumstellar interaction of Extragalactic Supernovae Circumstellar interaction of the shocked ejecta gives rise to emission in radio and X-ray bands. Observations of young supernovae in these wave bands unravel the aspects of circumstellar interaction such as the mass loss rate from the pre-explosion progenitor star and the structure of the outer region of the supernova, between the blast wave shock and the reverse shock. I present here the observations of few young extragalactic supernovae... Poonam Chandra Tata Institute of Fundamental Research Mumbai, India |
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22/04/2003 - 14:00
Astrosismología no adiabática en estrellas Delta Scuti y fotometría multicolor La astrosismología es una de las herramientas más potentes que tenemos para el estudio de la estuctura interna de estrellas aisladas. Esta se ha basado hasta ahora en la observación de las frecuencias de oscilación estelar y en el ajuste e identificación de estas observaciones mediante modelos teóricos. Pero para la mayor parte de las estrellas el solo ajuste de las frecuencias no es suficiente. Recientemente se ha puesto al dia otro método... Andrés Moya Bedón Instituto de Astrofísica de Andalucía - CSIC |
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04/04/2003 - 14:00
Basic ingredients for the biggest blasts in the cosmos There is now general agreement that gamma-ray bursts involve extraordinary power outputs, posing a severe theoretical challenge and - irrespective of which detailed model proves correct - involving some fascinating and extreme physical processes. I shall focus on some of the key issues relating the modeling of the trigger and the formation of the ultra relativistic outflow which has been proven to be a formidable challenge to computational... Enrico Ramírez Ruiz IoA, Cambridge, UK |
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28/03/2003 - 13:00
Cinemática y dinámica de pares aislados de galaxias: observaciones Fabry-Perot La interacción de galaxias es un fenómeno común en el Universo. Los efectos que tienen este tipo de encuentros sobre cada galaxia van desde la formación y/o supresión de estructura, la inducción de episodios de formación estelar y eventual actividad nuclear, hasta la transformación del tipo morfológico de las mismas. A través del estudio de su cinemática, la interacción entre galaxias nos da además la oportunidad de estudiar características como... I. Fuentes Carrera Instituto de Astronomía, UNAM, México |
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14/03/2003 - 13:00
Stellar population synthesis as an inverse problem. Application to nearby galaxies. The problem of ``stellar population synthesis'' is to derive the stellar population of an unresolved stellar system using a database of stars or clusters. In this talk I will set out the two different approaches adopted since the 60s in order to solve this problem and will discuss the connected drawbacks. Then I will expose an inverse stellar population synthesis method that I developped with Didier Pelat from the ``Observatoire de Meudon'' (... J. Moultaka Universidad de Colonia, Alemania |
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10/03/2003 - 13:00
Metallicity in Photon Dominated Regions Dense molecular ISM is the site of star formation. FUV radiation from hot stars heat the nearby molecular gas establishing a region called Photon Dominated Regions (PDRs), where the physical and the chemical processes are dominated by the FUV field. The UV radiation not only heats the molecular gas but also regulates the star formation process itself. In low metallicity systems, such as LMC, SMC and dwarf galaxies, a reduced number of dust... S. Jekayumar Universidad de Colonia, Alemania |
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10/02/2003 - 13:00
El papel de los archivos en la investigación astronómica Aunque durante mucho tiempo no ha sido así, hoy se encuentra ampliamente aceptado el hecho de que los archivos juegan un papel fundamental en la investigación astronómica. Basta mirar las estadísticas de uso de archivos de misiones como HST para darse cuenta de que este hecho es una realidad innnegable. El objetivo de esta presentación es el de, tras una breve introducción histórica de los archivos en Astronomía, definir de forma precisa qué se... Enrique Solano LAEFF, Madrid |
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06/02/2003 - 13:00
Peculiar Star Complexes Tbd Yuri Efremov Sternberg Astronomica Institute, Moscow State University |
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24/01/2003 - 13:30
A new H alpha survey of star formation in field spiral and irregular galaxies I will discuss results from the recently-completed H-alpha Galaxy Survey (HaGS), which resulted in H alpha and broad-band R imaging of 334 star-forming galaxies out to 3000 km/s, selected as an unbiassed subset of the Uppsala Galaxy Catalogue. Initial results from this survey include measuring the type dependence of star formation activity, determination of the effect of the group environment on star formation, normalised to activity in isolated... Phil James Astrophysics Research Institute, Liverpool John Moores University, UK |
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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 Astrophysics Research Institute, Liverpool John Moores University, UK |
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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 Instituto de Astrofísica de Andalucía - CSIC |
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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 IMAFF (CSIC), Madrid |
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20/11/2002 - 13:00
Supervientos Galácticos Tbd Guillermo Tenorio Tagle INAOE, Puebla, México |
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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 Department of Physics, Lancaster University |
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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 Max-Planck Institute fuer Radioastronomie, Bonn, Germany |
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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 New Mexico State University, USA |
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04/10/2002 - 14:30
Modelization of the giant HII regions NGC588 and NGC595 Tbd Luc Jamet Observatoire de Meudon, Paris |
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04/10/2002 - 14:00
Investigating the Starburst-AGN connection Tbd Lucimara Martins Univ. Federal de Santa Catarina (Brasil) |
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03/10/2002 - 14:00
The evolution of stars and gas in Starburst galaxies Tbd Roberto Cid Fernandes Univ. Federal de Santa Catarina (Brasil) |
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02/10/2002 - 14:00
Dust: a solution to the temperature fluctuation problem in photoionized nebula? Tbd Grazyna Stasinska Observatoire de Meudon, Paris |
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01/10/2002 - 14:00
Mass accretion to supermassive blackholes in the nuclei of galaxies Tbd Thaisa Storchi-Bergmann Instituto de Física- UFRGS (Brasil) |
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30/09/2002 - 14:00
Jet directions in AGNs Tbd Henrique Schmit NRAO (USA) |
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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 Indian Institute of Astrophysics, Bangalore, India |
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17/09/2002 - 14:00
Remanente de supernovas, estrellas de neutrones y el medio interestelar Tbd Gloria Dubner IAFE, Buenos Aires, Argentina |
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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 University of Cologne, Germany |
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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 Research School of Astronomy and Astrophysics, Mt. Stromlo and Siding Spring Obs., Australia |
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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 Observatoire de Bordeaux, France |
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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 Instituto de Astrofísica de Andalucía - CSIC |
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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 UNAM, México |
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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 Institute of Theoretical Physics and Astrophysics, Univ. of Kiel, Germany |
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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 ESA & STScI, USA |
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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 Universidad de Oxford, UK |
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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 Instituto de Astrofísica de Andalucía - CSIC |
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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 Space Telescope Science Institute (Baltimore, USA) |
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24/04/2002 - 14:00
New results from Plateau de Bure Tbd Michel Guelin IRAM (Grenoble, Francia) |