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)

251 - 300 de un total de 1135


18/05/2017 - 12:30
Bombs and flares at the Surface and Lower Atmosphere of the Sun
A spectacular manifestation of solar activity, is the appearance of transient brightenings in the far wings of the H(alpha) line, originally known as "Hydrogen bombs” but now as "Ellerman bombs" (EBs) after their discoverer. Recent observations obtained by the Interface Region Imaging Spectrograph (IRIS) have revealed another type of plasma ``bombs'' (UV bursts) with high temperatures of perhaps up to 80 000 K within the cooler lower solar...
Prof. Viggo Hansteen
Institute for Theoretical Astrophysics, University of Oslo & IAA-CSIC
11/05/2017 - 12:30
The Early History of Gamma-ray Bursts
The discovery of Gamma-Ray Bursts (GRBs), and the subsequent realization that they are the result of the largest and most distant explosions in the Universe, represents one of the most surprising and fundamental discoveries in astronomy in the past century. Several space-borne and ground-based breakthrough observations in GRBs that led to this realization occurred during the 1990’s. This discovery resulted in the award of the 2011 Shaw Prize...
Prof. Gerald J. Fishman
NASA – Marshall Space Flight Center (Ret.) Huntsville AL, USA
09/05/2017 - 12:30
Blender 3D, el programa definitivo
Blender es un potente programa multiplataforma que se distribuye libremente y es de código abierto. Entre sus aplicaciones más inmediatas está el modelado y la animación 3D, pero es un programa muy versátil que se puede usar para muchos otros propósitos. En esta charla presentaremos ejemplos de uso de Blender para la visualización de datos científicos y divulgación de la Ciencia; para la creación de diseños y piezas tridimensionales que pueden...
Dr. Francisco M. Gómez Campos
Departamento de Electrónica y Tecnología de los Computadores, UGR
28/04/2017 - 12:30
Gravitational waves: the "other light" from Cosmos
First direct detections of gravitational waves were reported in the first half of 2016. These observations represented: i) a confirmation of a fundamental prediction of General Relativity dynamics, and ii) a demonstration of the existence of binaries of stellar-mass black holes capable of merging in a timescale shorter than the Universe's age. This talk will review the basic elements needed to frame the two statements above. The presentation...
Prof. J.L. Jaramillo
Institut de Mathématiques de Bourgogne (IMB) Université de Bourgogne
27/04/2017 - 12:30
The large abundance discrepancy phenomenon in planetary nebulae
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. In planetary nebulae (PNe), a common explanation of this discrepancy is that two different gas phases coexist: a hot component with standard metallicity, and a...
Dr. Jorge García Rojas
20/04/2017 - 12:30
Spatially resolved star formation history of CALIFA galaxies: Implications for galaxy formation
One year after the final data release of the CALIFA survey, I will revise the results obtained from the analysis of the spatially resolved stellar population properties of galaxies and their impact on our knowledge on galaxy formation and their evolution. I will do special emphasis in the more recent results on the spatially resolved star formation histories of galaxies obtained for our group at the IAA. I will show, in my opinion, the...
Prof. Rosa González Delgado
06/04/2017 - 12:30
Fractal analysis in pulsating stars: what is and what we can learn from it
I will describe the basic ideas of my line of research, concerning the develop of classification criteria and algorithms for the identification of delta Scuti, gamma Doradus and Solar-like pulsating stars, based on chaos analysis and multi-fractal analysis. In fact multi-fractal behaviour in light curves, which emerges at the onset of chaos, could be the fingerprint of the stochastic mechanism of modes excitation, due to an outer convective...
Dr. Sebastiano de Franciscis
30/03/2017 - 12:30
Star formation in nearby early-type galaxies
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. In order to separate nebular emission lines from the underlying stellar contribution, we fit the stellar population model to the SDSS spectra of these S0 galaxies. According to the BPT diagram...
Dr. Qiusheng Gu
Universidad de Nanjing, China
23/03/2017 - 12:30
Detection of gravitational waves from space: the LISA mission
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. In 2015, the Director of Science of ESA appointed an external committee, with Michael Perryman as chair, to advise on the technical feasibility of the LISA mission, and the technology development...
Prof. M. Perryman
European Space Agency
16/03/2017 - 12:30
Space astrometry: the Hipparcos and Gaia missions
The talk will provide a short historical context and describe the scientific motivation for these missions, outline the essential experimental principles which underpin their measurements, and give an overview of the science objectives, including Gaia's expected yield of many thousands of astrometrically-detected exoplanets.
Prof. M. Perryman
European Space Agency
09/03/2017 - 12:30
Recovering information beyond the power spectrum of large-scale structure
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, and many of its possible extensions. However, it may be possible and preferable to use recently devised alternative statistics, such as the line...
Dr. Joyce Byun
Sussex University (UK)
02/03/2017 - 12:00
Supermassive Black Holes: Impact on Galaxy Formation and Evolution
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, astronomers have now discovered that supermassive black holes not only exist, but that they are very common and play a critical role in the formation and...
Prof. Luis Ho
Kavli Institute for Astronomy and Astrophysics, Peking University
23/02/2017 - 12:30
The impact of environment and confusion of the observed HI galaxy population
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. We use the ALFALFA 70% catalogue, the largest uniform catalogue of extragalactic HI sources to date, to explore the environmental dependence of the HI mass function based on the projected...
Michael Jones
16/02/2017 - 12:30
Cold plasma and magnetic reconnection at the magnetopause boundary layer
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. Several studies have reported the presence of cold plasma of ionospheric origin at the magnetospheric side of the magnetopause boundary layer. As a result, the particle distribution functions involved in reconnection are far from equilibrium, exhibiting a cold...
Dr. Sergio Toledo Redondo
European Space Agency (ESAC), Madrid, Spain
09/02/2017 - 12:30
Molecular gas and dust in low-metallicity starbursts
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. Although the interstellar medium (ISM) in such galaxies was thought to be virtually dust-free, over the last decade, observations have shown that dust can be an important constituent of even a low-metallicity ISM. However, the molecular...
Dr. Leslie Hunt
INAF-Osservatorio Astrofisico di Arcetri, Florencia
02/02/2017 - 12:00
Living on the Edge: Superthin Galaxies and the Cosmic UV Background
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 . cm-2 . The simple structure of the superthins makes them ideal cosmological laboratories (Uson and Matthews, Astron. J. 125, 2455, 2003). I shall present the results of high-...
Prof. Juan Usón
31/01/2017 - 12:30
Asteroid surfaces: irradiation and VIS-IR micro-spectroscopy in the laboratory
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. Among these, micro-IR spectroscopy has the advantage of being totally non-destructive and allowing direct comparison with astronomical observations. With the development of Focal Plan...
Dr. Rosario Brunetto
Institut d'Astrophysique Spatiale, CNRS/Université Paris Sud, Orsay, France
26/01/2017 - 12:30
Novae as Lithium factories in the Milky Way
The abundance of Lithium observed in very young stellar populations is ~4 times larger than the primordial one estimated by recent Planck measurements. Since Lithium is easily destroyed in stellar interiors, the search for astrophysical sources responsible for of the observed Lithium over-abundance was a mystery for decades. In this seminar I'll discuss the recent detection of Lithium in the spectra of two slow novae, V1369 Cen and V5668 Sgr,...
Dr. Luca Izzo
19/01/2017 - 12:30
Witnessing the birth of a planetary nebula
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. During of a long-time study of water masers in post-AGB stars and planetary nebulae, we identified an object (IRAS 15103-5754) in which we believe...
Dr. Jose Francisco Gómez
12/01/2017 - 12:00
Calar Alto, presente y futuro
Esta charla pretende dar una visión general del estado actual del observatorio de Calar Alto mostrando los principales hitos conseguidos en los últimos años. La re-apertura de instalaciones, la concesión de nuevas ayudas del MINECO para mejoras de infraestructuras y la celebración del workshop de instrumentación en Granada, ha abierto un nuevo escenario que el observatorio va a afrontar en los próximos años.
Dr. Jesús Aceituno, director de CAHA
02/12/2016 - 12:30
Multiwavelength analysis of PBC J2333.9-2343
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. In the present work we focus on the nucleus of PBC J2333.9-2343, which called our attention because it is a giant radio galaxy that shows different and incompatible...
Dr. Lorena Hernández García
IAPS-INAF, Rome, Italia
01/12/2016 - 12:30
History of solar activity recorded in polar ice
Un equipo de investigación internacional en el que participa el conferenciante ha reconstruido la actividad magnética solar de los últimos diez mil años analizando para ello la concentración de isótopos cosmogénicos.
Dr. Antonio Ferriz
Universidad de Vigo
24/11/2016 - 12:30
Big Data at the IAA: main ideas and how to run a real application at the IAA computation cluster
A brief description of the Big Data paradigm is presented minimizing the technical details, reviewing previous work at IAA and showing a practical case demonstration.
Dr. Rafael Morales
17/11/2016 - 12:30
The CaII triplet in Quasars: from the accretion disk to the star formation
Active galactic nuclei (AGN) show a great diversity of optical and UV emission line properties. Dynamical and physical models should be built accordingly. The presence of strong FeII emission suggested the existence of a region shielded from high energy photons, where the low ionization lines are emitted.
Mary Loli Martínez Aldama
10/11/2016 - 12:30
Very High Energy gamma rays from AGNs: key for AGN structure and cosmological studies
The key for AGN structure and cosmological studies.
Dr. Josefa Becerra
NASA Goddard Space Flight Center / U. of Maryland
09/11/2016 - 12:00
Star Formation Close to and Accretion onto the Supermassive Black Hole Sgr A*
The environment of Sgr A* provides a window to the close-up study of star formation under extreme physical conditions
Prof. Farhad Yusef-Zadeh
Northwestern University
03/11/2016 - 12:30
A search for neutral gas outflows in nearby (U)LIRGs
I will present a search for outflows in a sample of 38 local (U)LIRG systems (51 individual galaxies) observed with VIMOS/VLT and SINFONI/VLT integral field units.
Dr. Sara Cazzoli
24/10/2016 - 12:30
RadioAstron observations in the jet in 0836+710
Space VLBI observations with RadioAstron provide an extraordinary improvement of angular resolution.
Laura Vega
MPIfR (Bonn)
20/10/2016 - 12:30
The Unfied Model for AGN 30 years after, and recent support for an Evolutionary Model of AGN
I shall comment on the difficulties faced today by the so called "Unified Model" (UM) for AGN.
Prof. Deborah Dultzin Kessler
IA-UNAM, Mexico
04/10/2016 - 12:30
The VIMOS Ultra Deep Survey: galaxy formation and evolution, 13Gyr back in cosmic time
The first phases of galaxy formation and evolution remain poorly understood and improved observational constraints are needed to test the theoretical picture and simulations. I will present the results from the VIMOS Ultra-Deep Survey (VUDS)
Prof. Olivier Lefevre
Laboratoire d'Astrophysique de Marseille
29/09/2016 - 12:30
Presentation of the HETH group (High Energy Transients and their Hosts)
HETH (High Energy Transients and their Hosts) is one of the youngest groups at IAA, founded in 2012, and belongs to both the extragalactic and stellar department. Thanks to recent success in funding applications, both by the group and by external researchers, HETH has now grown to a group of 7 young researchers.
Dr. Cristina Thöne
22/09/2016 - 12:30
Delving into the gas-phase of CALIFA galaxies to trace O and N gradients
CALIFA (Calar Alto Legacy Integral Field Area survey) has provided spatially resolved optical spectra of thousands of HII regions in spiral galaxies of the Local Universe whose properties can be linked with the integrated properties of the host galaxies...
Dr. Enrique Pérez Montero
15/09/2016 - 12:30
Proxima b: What could I say you already do not know about it?
This august, we have published clear evidence of a planet orbiting the nearest star to Earth, Proxima Centauri, at a distance of 1.295 parsecs (4.2 ly) and one of the best-studied low-mass star.
Dr. Pedro Amado
23/06/2016 - 12:30
Using the local gas-phase oxygen abundances to explore a metallicity-dependence in SNe~Ia luminosities
In this talk I present an analysis of the gas-phase oxygen abundances of a sample of 28 galaxies in the local Universe (z<0.02) hosting Type Ia Supernovae (SNe Ia). The data were obtained with the 4.2m William Herschel Telescope (WHT).
Manuel Moreno Raya
CIEMAT, Madrid
16/06/2016 - 12:30
Space VLB interferometer RadioAstron: status and results
The RadioAstron Space VLBI mission utilizes the 10-m radio telescope on-board the dedicated Spektr-R spacecraft to observe cosmic radio sources with an unprecedented angular resolution at 92, 18, 6 and 1.3 cm.
Yuri Kovalev
Lebedev Physical Institute, Moscow, Russia
09/06/2016 - 12:30
Blazars: Order and Disorder
Blazars are the most luminous persistent objects in the sky. They emit light across the entire electromagnetic spectrum, from low-energy radio waves to high-energy gamma-rays, and they exhibit variability on timescales that range from years down to minutes. The launch of the Fermi Large Area Telescope (LAT) in 2008 has ushered in a new era of high-energy astrophysics.
Prof. Nicholas Macdonald
Boston University, USA
02/06/2016 - 12:30
Star formation and AGN activity in the most luminous LINERs in the local universe
In this talk I will focus on the most luminous LINERs in the local universe, where we studied their SF and AGN activity in order to understand the LINER phenomenon in relation to star-forming galaxies and to compare their properties with those of the LINERs at z ~ 0.3.
Dr. Mirjana Povic
25/05/2016 - 12:30
ECS: Diseño y construcción de Observatorios Astronómicos
ECS es una empresa de ingeniería especializada en Observatorios Astronómicos. Realiza los pertinentes estudios y evaluaciones de calidad de cielo, logística y necesidades específicas, para ubicar y diseñar el observatorio.
Francisco Ángel Espartero Briceño
Administrador ECS
19/05/2016 - 12:30
The magnetic field vector in solar chromospheric structures: the diagnostic potential of the near infrared He I 1083nm triplet
The solar chromosphere is permeated by solar structures such as sunspots, surges, flare ribbons, prominences (filaments) or spicules, where non-local thermodynamic equilibrium effects dominate the state of the plasma and where the magnetic fields are expected to be much lower in intensity than in the photosphere underneath.
Dr. David Orozco
12/05/2016 - 12:30
Sgr A* and its environment: insights from X-ray observations
Almost every massive galaxy has at least one super-massive black hole (SMBH) at its center. Most (>90%) of those SMBHs are quiet. Understanding the accretion of low-luminosity SMBHs represents a very important and fundamental problem in astronomy.
Dr. Daniel Wang
University of Massachusetts
05/05/2016 - 12:30
Formación Estelar: ¿podemos acotar el problema?
Mientras que la evolución estelar conforma un cuerpo teórico bien estructurado, incluyendo aquí las últimas fases de la misma, la formación estelar está lejos de admitir una formulación teórica predictiva que permita, conociendo las propiedades físicas de la nube molecular, pergeñar las propiedades de la futura población estelar naciente.
Dr. Emilio Alfaro
28/04/2016 - 12:30
The lifetime dilemma of evaporating black holes
The standard view is that black holes exist, maybe not with all the properties of strict black holes in classical General Relativity, but sufficiently close to them that one does not need worrying in the astrophysical practice.
Dr. Carlos Barceló
21/04/2016 - 12:30
Colloquium on ERC's proposals
Colloquium on ERC's proposals
Drs. Alejandro Luque & Rainer Schoedel
18/04/2016 - 12:30
Issues in star and cluster formation
The upper mass stellar initial mass function is similar to the mass function of young star clusters. I argue that this is a basic result expected when gravitational focusing on scales much larger than the Jeans length operate. I will also present recent VLBI studies of Orion which yield new distance estimates.
Prof. Lee Hartmann
University of Michigan
13/04/2016 - 12:30
Young brown dwarfs: exploring the bottom of the Initial Mass Function
Brown dwarfs are the objects that bridge the realms of stars and planets, making them important benchmarks for testing star and planet formation theories. In particular, studies of brown dwarfs at young ages are crucial for understanding the mass dependence in the formation and early evolution of stars.
Lda. Koraljka Muzic
Universidad Diego Portales, Chile
07/04/2016 - 12:30
CARMENES as a precursor for HIRES@E-ELT: First results at the telescope
CARMENES (Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Échelle Spectrographs) is the next generation instrument built for the 3.5m telescope at the Centro Astronómico Hispano-Alemán (Calar Alto Observatory; CAHA, Almería, Spain).
Dr. Pedro Amado
31/03/2016 - 12:30
Are LIGO data connected?
The analysis of ultra-precise data of stellar light variations observed with satellites (CoRoT, Kepler, SoHO, etc.) has revealed some unexpected results that cannot be explained by theory.
Prof. Rafael Garrido/Dr. Javier Pascual
17/03/2016 - 12:30
OCTOCAM: A fast multi-channel imager and spectrograph proposed for the Gemini Observatory
OCTOCAM has been proposed to the Gemini observatory as a workhorse imager and spectrograph that will fulfill the needs of a large number of research areas in the 2020s.
Dr. Antonio de Ugarte
10/03/2016 - 12:30
Shaking the grounds of unification: are type 1 and type 2 AGN intrinsically different?
The simplest standard unified models of Active Galactic Nuclei (AGN), put forward more than 30 years ago, postulate that the diversity of observed properties of AGN can be largely explained as a viewing angle effect resulting in anisotropic nuclear obscuration. A key ingredient of these models is a homogeneous distribution of dust and gas located at tens of parsecs that obscures the AGN nuclear region from certain lines-of-sight (the ‘torus’)....
Dr. Silvia Mateos
04/03/2016 - 12:30
Multiwavelength studies of massive stars
We will review the importance of multi-wavelength studies of massive stars and how each of the wavelength ranges may provide crucial and complementary information to characterize these objects. We will discuss the consistency of UV through radio studies of O stars, LBVs and WRs as well as the reliability of analyses based on a limited wavelength region.
Dr. Francisco Najarro
Departamento de Astrofísica, Centro de Astrobiología, CSIC-INTA