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.

Para más información contactar con duffard (at)

301 - 350 de un total de 1035


19/07/2012 - 14:00
A deeper look on thick discs using data from the Spitzer Survey of Stellar Structure in Galaxies (S4G)
Thick discs are disc-like components with a scale height larger than that of the classical discs. They are  most easily detected in close to edge-on galaxies in which they appear as a roughly exponential excess of light which appears a few thin disc scale heights above the midplane. Their origin has been considered mysterious until recently and several formation theories have been proposed. Unveiling the origin of thick discs is...
Sébastien Comerón
University of Oulu, Finland
13/07/2012 - 14:00
Jets de Estrellas Jóvenes: Teoría
En los últimos años ha habido un gran esfuerzo en la construcción de modelos teóricos que nos permitan entender y explicar distintos aspectos de los jets producidos por estrellas en su vida temprana. Algunos de estos aspectos son: su mecanismo de producción y colimación, la generación de nudos en su interior y la interacción con el medio circundante. En este trabajo se...
Jorge Cantó
UNAM, México
05/07/2012 - 14:00
Infraestructuras de cálculo en el Instituto de Astrofísica de Andalucía (IAA): pasado, presente y futuro.
Actualmente el IAA dispone de una gran infraestructura de cálculo, la conocida Sala Grid, que alberga 32 nodos IBM x3950M2 con un total de 128 procesadores Intel Xeon Quad Core 2.93GHz (512 cores), 4 TeraBytes de memoria RAM, y una capacidad de almacenamiento total de 315 TeraBytes, todo ello interconectado con tecnología de red Infiniband a 20Gbps. Hasta ahora esta infraestructura se ha utilizado dentro del marco del...
José Ramón Rodón
21/06/2012 - 14:00
The AGN-Starburst connection in nearby (U)LIRGs: a radio view
I review the main results obtained by our team in the last few years, on studies of nearby Luminous and Ultra-Luminous Infrared Galaxies (LIRGs and ULIRGs, respectively). These galaxies are expected to form stars at rates as large as (10-100) Msolar/yr, or even higher, and constitute excellent laboratories for studies of star-formation. They are also expected to be bright at radio wavelengths.  Among other results, I will present...
Miguel Ángel Pérez Torres
The dark side of (U)LIRGs
14/06/2012 - 14:00
Holographic imaging of dense fields: the amazing poor man's MCAO
Being able to image large fields at the diffraction limit of large telescopes is one of Astronomy's  oldest dreams. The standard way toward achieving this goal is to throw lots of money at it and build ever more sophisticated adaptive optics (AO) systems. As an alternative way, I present an algorithm for speckle holography that has been optimised for diffraction limited imaging of crowded fields.  I will present the exciting...
Rainer Schoedel
31/05/2012 - 14:00
Nitrogen is one of the most abundant metals in the ISM and thus emitting strong emission-lines in the optical spectrum of ionized gaseous nebulae. Its nucleosynthetic origin is quite different to that of oxygen as it is produced both by massive stars and by intermediate- and low-mass stars. Thus, the study of the nitrogen-to -oxygen ratio by means of especially defined strong-line methods offers a powerful tool to inspect with...
Enrique Pérez Montero
24/05/2012 - 14:00
Development of a miniaturized real time attitude controller for micro and nanosatellites
In last years low cost space missions have become an instrument for many research institutes to test new technologies and perform low-orbit Earth science using commercial components. Cubesat represent the most popular standard for microsatellites, but due to low cost components and reduced size, there are no complete attitude controllers available for the smallest versions. This talk will describe the development of a control system...
Gian Paolo Candini
17/05/2012 - 14:00
Ice Rocks in the Solar System
The study of the minor bodies in the Solar System has historically been a major source of information. The term "Minor Body" covers objects exhibiting very different dynamical and compositional characteristics, in fact, every object in the Solar System that is not a planet or a star, is a minor body. All these objects share a common link, they were the building blocks of the Solar System that we observe today and are considered to...
Noemi Pinilla Alonso
10/05/2012 - 14:00
The thirteen billion year history of the most massive black holes
Super-massive black holes (BHs) that are found in the centers of most galaxies started their growth when the universe was about 300 million years old. Some of these "seed black holes" were probably the remnants of the earliest stars. The largest BHs, that are some 10^10 times more massive than the sun, accumulated most of their mass during the first 3 billion years after the big bang. The less massive ones are still growing today. I...
Hagai Netzer
Tel Aviv University
03/05/2012 - 13:00
Detecting substructure in the galactic stellar halo with Gaia
We present a Gaia mock catalogue we have created to test various approaches to detect the presence of past mergers in the Galactic halo. We propose an extension of the great circle cell method of Johnston et al. (1996), which is optimized to identify tidal debris along great circles in the sky. We have added the proper motion information that will be supplied by Gaia to add a kinematical restriction to the original method. We test our...
Luis A. Aguilar
Inst. de Astronomia, UNAM/México
26/04/2012 - 14:00
The Hubble Space Telescope's Wide Field Camera 3
The Wide Field Camera 3 (WFC3) was installed in 2009 and is now the primary science instrument on HST. Under development since 1998, WFC3 expanded Hubble's ultraviolet and infrared imaging capabilities by factors of more than 20. WFC3 also provides an unparalleled capability for low resolution infrared spectroscopy of very faint sources. This talk will discuss the scientific goals for WFC3, its basic design and technological...
John Mackenty
Space Telescope Science Institute
12/04/2012 - 14:00
Oxygen in the Universe: a historic introduction
We briefly review the main steps that led to the discovery of oxygen in the Universe and to the understanding of its  production and cosmic evolution. We highlight some of the problems that still need an explanation.
Grażyna Stasińska
Observatoire de Paris
28/03/2012 - 14:00
A new golden age in Spanish Astronomy: the GTC
Spanish Astronomy  has experienced a great development during the last 20-30 years, which can be, in part, associated to the available technological resources.  Extragalactic astronomy  started in Spain due to the agreement  for the development of the Observatory of the Roque de los Muchachos, with the installation of the INT 2.5m and WHT 4.2m telescopes and their associated instrumentation.  Of course the CAHA...
Josefa Masegosa
15/03/2012 - 13:00
What can we learn from gamma-ray anisotropies?
Over the last two decades the study of angular anisotropies provided a huge amount of information, when used to analyze the Cosmic Microwave Radiation. The same approach can be extended also to higher energies, studying angular fluctuations in the gamma-ray emission. In this talk I will refer in particular to the data of the Fermi-LAT telescope that has recently presented its measurement of the angular power spectrum (APS) of anisotropies at...
Mattia Fornasa
05/03/2012 - 13:00
MIRADAS: The Next-Generation Infrared Spectrograph for the GTC
MIRADAS is a near-infrared multi-object R=20,000 echelle spectrograph for the 10.4-meter Gran Telescopio Canarias. It is the most powerful astronomical instrument of its kind ever envisioned, with an observing efficiency more than an order of magnitude greater than current capabilities for 10-meter-class telescopes. The (still-growing) MIRADAS science team includes more than 40 scientists from 8 institutions in the GTC community. In this talk...
Stephen Eikenberry
University of Florida, USA
23/02/2012 - 13:00
Seeking and Mocking Non-thermal Emission in Galaxy Clusters
Diffuse synchrotron radio emission is observed in many clusters of galaxies probing the presence of high energy cosmic ray (CR) electrons. This emission can be explained by the hadronic model where the electron population originates from the interactions between CR protons and the cluster ambient gas. Additionally, a very high energy gamma-ray emission is also expected. I will briefly review the current knowledge on the non-thermal emission...
Fabio Zandanel
16/02/2012 - 13:00
Modelos teóricos de las nebulosas de Eta Carinae
En esta plática se presentan modelos teóricos de los eventos eruptivos de 1840 (la gran erupción) y de 1890 (la menor erupción) de la estrella masiva Eta Car. Las nebulosas bipolares en torno a la estrella se formaron de la interacción del material eyectado durante estas erupciones con el viento estándar de la estrella. En nuestros modelos, se supone un escenario de colisión de...
Ricardo Francisco González Domínguez
UNAM, México
02/02/2012 - 13:00
Efectos de los cúmulos ionizantes de baja masa en el espectro de regiones HII y galaxias
En este seminario presentaré mi trabajo de tesis sobre el modelado del espectro de líneas de emisión de regiones H II y galaxias con formación estelar. Primero hablaré sobre la influencia de los efectos de muestreo de la función inicial de masas estelares (IMF)  en el continuo ionizante de los cúmulos y en el espectro de regiones H II,  centrando la atención en los cú...
Marcos Villaverde
26/01/2012 - 13:00
Maser emission in evolved stars: from AGB to PNe
I will present a review of maser emission in evolved stars from the asymptotic giant branch (AGB) to planetary nebulae (PNe). The circumstellar envelopes of oxygen-rich evolved stars provide optimal conditions to pump different species of masers, emitting at radio wavelengths. Interferometric observations of masers are a powerful tool to study with the highest angular resolution the molecular gas around evolved stars, because...
Lucero Uscanga Aguilera
19/01/2012 - 13:00
Dwarf galaxies as dark matter laboratories
Dwarf spheroidal galaxies are key objects in the current cosmological paradigm: first, they are the least luminous galaxies, likely signaling the minimum halo mass at which gas can be accreted and converted into stars. Second, they all have ancient stellar populations, providing clues on star formation/feedback processes at early stages of the Universe. Third, they are the most numerous satellites about the Milky Way and M31,...
Jorge Peñarrubia
17/01/2012 - 13:30
Albedo and atmospheric constraints of dwarf planet Makemake from a stellar occultation
Makemake is an icy dwarf planet with a spectrum similar to Eris and Pluto, and is currently at a distance to the Sun intermediate between the two. Although Makemake’s size (1,420 ± 60 km) and albedo are roughly known, there has been no constraint on its density and there were expectations that it could have a Pluto-like atmosphere. Here we report the results from a stellar occultation by Makemake on 2011...
José Luis Ortiz
12/01/2012 - 13:00
Everything you always wanted to know about extinction but were afraid to ask
Twenty two years ago Cardelli et al. published their seminal paper on Galactic extinction laws. In the first part of my talk I will explore that (often quoted but also often misunderstood) paper and detail its strengths and weaknesses. In the second part I will describe the two datasets that have finally allowed the Cardelli et al. laws to be tested to their limit and I will present a new family of extinction laws derived from the new data...
Jesús Maíz Apellániz
10/01/2012 - 13:30
IAA: its structure, failures, and potential
 In this talk I will first show the structure of our Institute, the task division and the people responsible for these taks. I will also analyse all the procedures, customs and usages that drift us apart from the dream IAA. Finally, I will make some remarks about the (underestimated? disregarded?) potential of our Institute.
Matilde Fernández Hernández
22/12/2011 - 12:34
Dynamical Modeling of Luminous Infrared Galaxy Mergers
It is widely accepted that galaxy mergers can have a significant effect on galaxy properties and may be an important part of galaxy evolution. Enhanced star formation is one frequently observed property of (gas rich) mergers and theoretical prescriptions for star formation can generally reproduce the observed behavior. However a detailed study comparison of these prescriptions with individual galaxy merger events has not been...
George C. Privon
University of Virginia
15/12/2011 - 13:00
X-ray properties of nearby luminous infrared galaxies
I present results of X-ray observations of a complete sample of luminous infrared galaxies (LIRGs) from the GOALS, a multi-wavelength project to study the most luminous IR-selected galaxies in the local Universe. X-ray imaging at an arc-second resolution obtained with the Chandra X-ray Observatory provides locations of an active nucleus, if present, and extended morphology of starburst-driven winds in those LIRGs. An inspection of their X-ray...
Kazushi Iwasawa
ICREA, Barcelona
01/12/2011 - 13:00
Mass, metallicity and SFR relationships in star forming galaxies using deep surveys
To understand the formation and evolution of galaxies, it is important to have a full comprehension of the role played by Metallicity, Star Formation Rate (SFR), and stellar mass of galaxies. The interplay of these parameters at different redshifts will substantially affect the evolution of galaxies and, as a consequence, the evolution of these parameters provides important constraints for the galaxy evolution models. We studied the...
Maritza A. Lara-Lopez
Australian Astronomical Observatory
24/11/2011 - 13:00
The Bayesian Galaxy Cluster Finder and its Application to Large Surveys
One of the main purposes of Large Surveys is the study of galaxy clusters. However, it is not an easy task to compile a complete sample. In this talk, I will present a new technique for detecting galaxy clusters called the Bayesian Cluster Finder (BCF) which is able to determine the position, redshift and richness of clusters in any survey. I will introduce the simulations that we performed to test the algorithm through realistic mock galaxy...
Begoña Ascaso
17/11/2011 - 13:00
Revealing the hidden supernova population in luminous infrared galaxies
A substantial fraction of star formation (SF) and hence of the core-collapse supernovae (CCSNe) in the Universe is hidden behind dust. At higher-z obscured star formation in luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) actually dominates over SF seen in the UV and optical. These same objects are expected to hide in their nuclear regions large numbers of undetected CCSNe. In this talk I describe our ongoing efforts using...
Seppo Mattila
Academy of Finland/University of Turku, Finland
03/11/2011 - 13:00
Gamma-Ray-Bursts, High-Energy-Cosmic-Rays and Beam-Plasma Instabilities
Gamma-Ray-Bursts and High-Energy-Cosmic-Rays are two of the most intriguing enigmas of astrophysics. A promising scenario solving both problems consists in the Fermi-like acceleration of particles by relativistic collisionless shocks. These shocks could generate the Gamma Burst together with some highly energetic cosmic rays, in the earlier phase of a Supernovae explosion. Later on, the  Supernovae Remnant could still accelerate cosmic...
Antoine Bret
Universidad de Castilla-La Mancha en Ciudad Real
27/10/2011 - 14:00
Locating the gamma-ray emission region in AGN from multi-messenger observations
Relativistic jets in AGN, in general, and in blazars, in particular, are among the most energetic and powerful astrophysical phenomena known so far. Their relativistic nature provides them with the ability to emit profusely at all spectral ranges from radio wavelengths to gamma-rays. They display extreme variability at all time scales (from hours to years). Since the birth of gamma-ray astronomy, locating the origin of gamma-ray emission has...
Iván Agudo
20/10/2011 - 14:00
Mapping star-formation in the Milky Way
In the last few years, it has become possible to measure the distance and the velocity vector of young stars located within 500 pc of the Sun with an accuracy of order 1% using Very Long Baseline Interferometry (VLBI) techniques. This represents an improvement by more than 1 order of magnitude over what was previously possible, and opens the door to some extremely high accuracy astrophysics. In particular, theoretical pre-main sequence...
Laurent Loinard
Universidad Autónoma de México
22/09/2011 - 14:00
Early r-process enrichment in the halo: Process and implications/The future role of the Nordic Optical Telescope
I: Early r-process enrichment in the halo: Process and implications Current thinking suggests that the outer Galactic halo formed first, with stars dominated by fresh C(NO) elements, but soon with increasing amounts of heavier elements. The now appreciable sample of extremely metal-poor (EMP) stars with [Fe/H] ~ -3 trace the transition to this chemically more diversified regime. A small fraction of these EMP giants contain r-process...
Johannes Andersen
NOT/University of Copenhagen
16/09/2011 - 13:00
Early Planet Formation from an Experimentalist’s Point of View
Planet formation starts in gaseous protoplanetary disks. Small grains move around, collide, stick together and grow. However, many collisional roads also lead to destruction of larger bodies. Which ones are prevailing and if this is the basic way to planet formation is still an open question, but there are modes to grow particles to larger size even in ‘high speed’ collisions. This talk will also touch upon processes of transport...
Prof. Gerhard Wurm
University of Duisburg-Essen, Germany
07/07/2011 - 14:00
Coagulation, restructuring and fragmentation of dust grains in the protoplanetary disks: first stages of Solar System formation
The understanding of the formation of the planetary systems is one of the main topics of modern astrophysics and its study requires a synergetic effort of observations, laboratory experiments and theoretical models. It is generally accepted that planets originate in the dust disk that remains around a star after its formation (protoplanetary disk). Nevertheless there are no clear ideas on the physical conditions that are required, neither on...
Walter Sabolo
Instituto de Astrofísica de Andalucía - CSIC
30/06/2011 - 14:00
Quasi-periodicities in the periodograms of Corot Delta Scuti stars
Periodic patterns are not expected to be found in the frequency spectra of delta-Scuti stars, as in solar-like pulsators. However, some efforts have been carried out in order to find any signal of periodicity in this type of stars (Handler et al., 1997; Breger et al., 1999, 2009). These works used ground-base observations and the results have not been conclusive. In our study we have used data from CoRoT of two delta-Scuti stars poorly known. We...
Antonio García Hernández
Instituto de Astrofísica de Andalucía - CSIC
20/06/2011 - 14:00
Simulation of Relativistic Jets with Macroscopic and Microscopic Processes and Associated Self-consistent Radiation
Relativistic jets are ubiquitous in astrophysical systems. In this talk I will present recent research results from RMHD simulations designed to study the CD kink instability of relativistic jets and the magnetic field amplification that occurs in relativistic shocks in an inhomogeneous medium. I will then present the results of RPIC simulations of particle acceleration in relativistic shocks and self-consistent calculation of the radiation at...
Ken Nishikawa
Univ. of Alabama, Huntsville/CSPAR, USA
16/06/2011 - 14:00
Time-Dependent Hamiltonians in Quantum Mechanics and Inflationary Cosmology
We revise the problem which appears in Quantum Mechanics when the Hamiltonian depends explicitly on time and provide a general setting to address such quantum systems. As a paradigmatic example we analyse the case of the damped harmonic oscillator (satisfying the Caldirola-Kanai equation) and extend the system to accomodate the ordinary time translation as a true symmetry (Bateman dual system). This general scheme applies in particular to the...
Julio Guerrero García
Universidad de Murcia
07/06/2011 - 14:00
EST: a large solar telescope for the XXI century
The European Solar Telescope (EST) is a project for a 4-meter class telescope to be located in the Canary Islands. It is promoted by the European Association for Solar Telescopes (EAST). This is a consortium formed by a number of research organizations from fifteen European countries (Austria, Croatia, Czech Republic, France, Germany, Hungary, Italy, the Netherlands, Norway, Poland, Slovak Republic, Spain, Sweden, Switzerland, and United...
Manolo Collados
Instituto de Astrofisica de Canarias (IAC)
02/06/2011 - 14:00
Coronal heating on the Sun: new observations and “realistic” 3D numerical models
The heating of the solar corona is a long standing problem of solar physics, in fact dating back to the time when it was first discovered that the corona was quite hot. In short, the question is how one can find a credible physical mechanism to transport and dissipate a small fraction of the “mechanical” energy contained in the convection zone in(to) the corona. Amusingly, most answers to the question date back to the late 1940...
Prof. Viggo Hansteen
University of Oslo
31/05/2011 - 14:00
Dark Matter and Stars
Under the assumption that Dark Matter (DM) is composed of Weakly Interacting Massive Particles (WIMPs), it can affect the properties of stars. In the local Universe effects are feeble, nonetheless they can in principle be used in order to pose constraints on the nature of DM particles with observations of the Sun, and of compact objects at the Galactic Center, in Globular Clusters and in White Dwarf Galaxies. The first generation of stars to...
Fabio Iocco
Institute d'Astrophysique de Paris
26/05/2011 - 14:00
The BigBOSS dark energy experiment
The BigBOSS experiment is a project designed to unlock the mystery of dark energy using existing ground-based facilities operated by National Optical Astronomy Observatory (NOAO). A new 5000-fiber R=5000 spectrograph covering a 3-degree diameter field will measure clustering properties in the distribution of galaxies and hydrogen gas spanning redshifts from 0.2 < z <3.5. This project will enable an unprecedent multi-object spectroscopic...
F. Prada & M. Azzaro
Instituto de Astrofísica de Andalucía - CSIC
12/05/2011 - 14:00
ALMA Early Science
Stéphane Léon
05/05/2011 - 14:00
Gamma-ray Bursts - what kind of stars do they come from?
Long GRBs are the most luminous objects in the universe and mark the collapse of a very massive star, usually accompanied by a relativistic supernova. Their large distances do not allow us to directly identify the progenitor star as we were able to do with some type of supernova. We therefore rely on indirect methods to derive some information on the kind of progenitor star or system and what makes a massive star to explode in a supernova or...
Christina Thoene
Instituto de Astrofísica de Andalucía - CSIC
28/04/2011 - 14:00
The connection between missing stellar cusps in galactic nuclei and general relativity
One of the most interesting sources of gravitational waves is the inspiral of compact objects on to a massive black hole (MBH), commonly referred to as an extreme-mass ratio inspiral. The small object, typically a stellar black hole, emits significant amounts of GW along each orbit in the detector bandwidth. On the other hand, recent observations of the Galactic center revealed a dearth of giant stars inside the inner parsec relative to the...
Pau Amaro Seoane
Albert-Einstein-Institute (MPG), Potsdam, Germany
14/04/2011 - 14:00
Discos de acreción alrededor de protoestrellas de masa alta e intermedia
Las observaciones directas, que resuelvan angularmente los discos de acreción en torno a estrellas jóvenes de masa alta e intermedia son escasas. Presentaré los resultados de nuevas observaciones radiointerferométricas de alta resolución angular que, junto con nuestros modelos teóricos, revelan la presencia de discos de acreción en torno a dos estrellas en formación. En el caso de la...
Mayra Osorio
Instituto de Astrofísica de Andalucía - CSIC
24/03/2011 - 13:00
The dirty side of astronomy: carbonaceous dust
Since the beginning of modern astronomy, dust has always been considered an obstacle on the path to understanding both nearby and far away phenomena. In this talk I will explain briefly the origin and the life-cycle of carbonaceous dust, introduce to new discoveries and old puzzles and eventually show how dust can be used as a powerful astronomical tool.  
Alessandra Candian
University of Nottingham, UK
22/03/2011 - 13:00
Analysis of chemical and dynamical processes in the Earth's Atmosphere with MIPAS data
MIPAS is a Fourier transform limb emission mid-infrared spectrometer in Earth orbit. It provides spectrally resolved radiance profiles in the 4.15 to 14.6 mum spectral region from about 5 km up to 70 km (in its nominal mode) and up to 150 km in special observation modes. At IMK and IAA, we retrieve temperature and the distributions of up to 30 trace species from these data, which then are used to study chemistry and dynamics of the atmosphere...
Gabi Stiller
IMK, Germany
17/03/2011 - 13:00
Star formation at high-z: a stacking approach applied to mm-data
Star formation is a key ingredient of the formation and evolution of galaxies. The associated dust emission has been observed up to very high-z. At mm wavelengths, this can be done thanks to the negative k-correction, which compensates the increasing luminosity distance. However, only the brightest sources can be detected with the present instruments, even with the early ALMA capabilities. Here we present a routine to perform stacking analysis...
Roberto Decarli
MPIA, Heidelberg, Germany
10/03/2011 - 13:00
El Centro Astronómico Hispano-Alemán: 2014-2018 y más allá
El Observatorio de Calar Alto cuenta en estos momentos con tres telescopios opticos-infrarrojos y un conjunto de 11 instrumentos que cubren un gran rango de necesidades en distintos campos científicos, con una demanda desigual por parte de la comunidad astronómica. Comenzando con los datos adquiridos durante segundo semestre del 2010, a lo largo del 2011 se procederá a la apertura del archivo público del observatorio, con el objetivo de...
David Barrado
German-Spanish Astronomical Center at Calar Alto (CAHA)
03/03/2011 - 13:00
A 2D Spectroscopy view of NGC 588
Most of today's stars were formed in high intensity episodes about 7-10 Gyr ago. However, at these redshifts both resolution and dimming effects make it difficult to study in detail the interaction of the gas, dust and newly formed stars. Giant H II regions in very nearby galaxies constitute their best local counterpart to address such a study. Here, I present an analysis of NGC 588, a GHIIR in M33, based on optical Integral Field Spectroscopy...
Ana Monreal Ibero
Instituto de Astrofísica de Andalucía - CSIC