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.

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251 - 300 de un total de 1035


27/03/2014 - 13:30
New findings on the X-ray emission from Wolf-Rayet nebulae
We present the most recent results of XMM-Newton and Chandra observations on the only four Wolf-Rayet (WR) nebulae observed to date. Given the limited number of observations and the different morphological and spectral characteristics of these nebulae, it has been difficult to understand the physics behind the plasma emission. Numerical and analytical models can not explain the 'soft' nature and low plasma temperatures (T~106 K)...
Jesús A. Toalá
20/03/2014 - 13:29
The Nature of the IR Emission in Low-Luminosity AGN at Parsec Scales
The vast majority of AGN belong to the low-luminosity class (LLAGN): they exhibit a low radiation efficiency (L/Ledd < 10^-3) and the absence of the big blue bump in their spectra, a signature of the accretion disk. The study of LLAGN is a complex task due to the contribution of the host galaxy, whose light outshines these faint nuclei. As a consequence, numerical models are usually compared with relatively poorly defined spectral energy...
Juan Antonio Fernández Ontiveros
13/03/2014 - 13:30
Quasars and their emission lines as cosmological probes
Quasars are the most luminous stable sources in the Universe. They are currently observed out to redshift z ~ 7 when the Universe was less than one tenth of its present age. Since their discovery 50 years ago astronomers have dreamed of using them as standard candles. Unfortunately quasars cover a very large range (8 dex) of luminosity making them far from standard. I briefly review several methods that can potentially exploit quasars...
Dr. Paola Marziani
Univ. Padova
06/03/2014 - 13:30
La Asociación de Mujeres Investigadoras y Tecnólogas (AMIT)
La incorporación de la mujer a la investigación, la docencia o la gestión de la Ciencia y las Humanidades supone un progreso social. La participación de las mujeres en estas esferas, sin embargo, no es igualitaria respecto a los hombres en la España de comienzos del siglo XXI. La presencia de la mujer es dramáticamente decreciente a medida que se sube en los escalones profesionales. AMIT es una...
J. Masegosa
20/02/2014 - 13:30
The AGN nature of LINER nuclear sources
The origin of the main excitation mechanisms in LINER (Low Ionization Emission Line Region) nuclei are still controversial, with nonstellar photoionization, fast shocks or hot stars as the principal candidates. In the AGN scenario, LINERs could represent the link between more powerful AGN and normal galaxies as suggested by their low X-ray luminosities. Their interest increases as they would be the dominant population of active...
Dr. I. Márquez
13/02/2014 - 13:30
A powerful new method to measure the atmospheric water vapour column.
We have developed a reliable powerful method to measure the atmospheric column of water vapour (PWV) down to very low levels. For this purpose we use and off-the-shelf cheap spectrometer to measure the equivalent width of the H2O bands at 940nm. In order to calibrate the measurements we use the radiative transfer model included in the package SCIATRAN to produce theoretical solar spectra as observed on the ground, based on simultaneous...
Prof. E. Pérez
06/02/2014 - 13:30
The bricks of the Very Large Telescope Interferometer
In this talk we will perform a review of the basic principles of the optical/near-infrared interferometry and of the current European facilities to use this observational technique. Particularly, we will describe the interferometric observables used at near-infrared wavelengths. We will provide a review of the current (and future) instruments available at the ESO Very Large Telescope Interferometer (VLTI), their advantages and limitations as...
Lic. Joel Sánchez Bermúdez
30/01/2014 - 13:30
The CHESS survey of the protostellar shock L1157-B1
Outflows generated by protostars heavily affect the kinematics and chemistry of the hosting molecular cloud due to strong shocks. These shocks heat and compress the ambient dense gas switching on a complex chemistry that leads to an enhancement of the abundance of several species, as reported in "chemically active" outflows, whose archetype is the outflow of the low-mass Class 0 protostar L1157. I'll present the results of...
Dr. Gemma Busquet
23/01/2014 - 13:30
Nucleosynthesis and molecular processes in evolved stars
Most of the stars (M < 8 solar masses) in the Universe end their lives with a phase of strong mass loss and experience thermal pulses (TP) on the Asymptotic Giant Branch (AGB), just before they form Planetary Nebulae (PNe). They are one of the main contributors to the enrichment of the interstellar medium and thus to the chemical evolution of galaxies. More specifically, the more massive AGB stars form very different isotopes (such as...
Dr. Anibal García Hernández
16/01/2014 - 13:30
Bar parameter evolution over the last 7 Gyr
The tumbling pattern of a bar is the main parameter characterising  its dynamics. This bar pattern speed, the bar ellipticity and its  length are the three observational parameters that fully characterize  bars. From numerical simulations, their evolution since bar formation  is tightly linked to the dark halo in which the bar is formed through  dynamical friction and angular momentum exchange. Observational ...
Dr. Isabel Pérez
05/12/2013 - 13:30
Stellar water fountains: planetary nebulae in the making
Planetary nebulae (PN) are one of the final phases in the evolution of low and intermediate mass stars (<8 Msun). They display a great variety of shapes, although in their previous phases (Asymptotic giant branch =AGB) they have a spherical geometry. The transition from spherical symmetry to asymmetry must occur during the short post-AGB phase or in the early PN phase. Here we present a special type of evolved stars, called "...
Dr. JFrancisco Gómez
28/11/2013 - 13:30
Galaxy clusters: galaxy laboratories and cosmological probes. A see you later seminar.
In this talk -my last one in the IAA for the moment- I will talk about the largest structures in the Universe: galaxy clusters. The first part of the talk will be focused on galaxy clusters embedded in the large scale structure: how we detect them and how we can use them to provide estimations of cosmological parameters. In the second part, I will talk about the galaxies living in clusters, in particular, about the brightest cluster...
Dr. Begoña Ascaso
07/11/2013 - 13:30
Proposing observations with the European VLBI Network
The European VLBI Network (EVN) is currently the most sensitive VLBI array in the world (its collecting area is about a hundred thousand square meters, or 1/10 of the planned Square Kilometer Array). I will give an overview of the EVN and the kind of science being done with this radio interferometric array, which essentially goes from Solar System studies up to quasars at high redshift. As a member of the EVN Programme Committee, I will...
Dr. Miguel Angel Pérez-Torres
31/10/2013 - 13:30
Digital Science: towards the executable paper
The science performed in Astronomy is digital science. This fact does not prevent the final outcome of an experiment is still difficult to reproduce. 
J. E. Ruiz
24/10/2013 - 14:30
AGN feedback and accretion in Perseus A
The Perseus Cluster is known as a famous observational example of (radio-mode) AGN feedback driven by the radio jet of the central galaxy Perseus A (NGC 1275, 3C 84). The feedback process is evident from observations of the intra-cluster medium showing X-ray bubbles filled with radio plasma. The radio jet generating these bubbles is powered by accretion onto the supermassive black hole in Perseus A. In this talk, I will present our results...
Dr. Julia Scharwächter
Observatoire de Paris, LERMA
17/10/2013 - 14:30
The Martian ionosphere
The ionospheres of the planets (those regions with a significant fraction of free electrons and ions) provide interesting clues about the interaction of the solar radiation and the solar energetic particles with the planetary atmospheres.They can also be used to gain information about the density and temperature of the neutral upper atmospheres, a region that in the Martian case has traditionally eluded observation. In this talk I will sketch...
Dr. Francisco González Galindo
10/10/2013 - 14:30
Hot potatoes: the compact obscured nuclei of dusty IR galaxies
Evidence is now mounting that most of the activity in some luminous infrared galaxies takes place in their compact obscured nuclei (CONs), regions of less than 100~pc in diameter, which harbor large amounts of warm (T$>$100~K) molecular material (N(H$_2$)$>10^{24}$~cm$^{-2}$). The combined effect of warm, shielded gas and intense infrared radiation produce rich molecular spectra, which make these objects unique laboratories to study...
Dr. Francesco Costagliola
IAA-CSIC, Radioastronomy and galactic structure group
03/10/2013 - 14:30
Spectroscopy of the short GRB 130603B: The host galaxy and environment of a compact object merger
The nature of short duration gamma-ray bursts (GRBs) remains a central problem of modern astrophysics. They are thought to be related to the violent merger of compact objects, such as neutron stars or black holes, which would make them promising sources of gravitational waves. The absence of supernovae signatures clearly indicates that SGRB progenitors differ from their long duration cousins, but constraints to-date arise almost entirely from...
Dr. Antonio de Ugarte Postigo
26/09/2013 - 14:30
Main-Belt Comets
Since the discovery of 133P/Elst-Pizarro in 1996, an object moving in a typical Main Asteroid Belt orbit, but displaying a comet-like tail, nine more of those objects have been identified. They constitute a new class of small Solar System bodies, the ``missing link'' between asteroids and comets. Three of those objects fall into the ``disrupted asteroids'' subgroup, where the activity is suspected to be driven by either a...
Dr. Fernando Moreno
12/09/2013 - 14:30
Cosmological Simulations of Galaxy Formation
We present a suite of simulated galaxies, that match a wide range of scaling relations over a large mass range at z=0, and follow the evolution of these relations and confront them with observational constraints. We then make connections to "galactic archaeology" by examining the nature of the major structural components of the discs, highlighting that far and near field cosmology can be combined using these types of simulations. We...
Dr. Chris Brook
Universidad Autónoma de Madrid
05/09/2013 - 14:30
SN 1993J and M81: a fruitful astrophysical collaboration
SN1993J, a powerful radio supernova high in the northern sky, has been monitored with VLBI though its lifetime. The VLBI observations have been phase-referenced to the core of M81. We will highlight the main results obtained: its extremely circular shell-like radio structure has expanded over 15 years in a rather self-similar way; the expansion is wavelength dependent, a result which can be mainly explained by a combination of a varying free-...
Prof. A. Alberdi
18/07/2013 - 14:30
Can we solve by solar magneto-seismology one of astrophysics great problems: Coronal heating enigma?
The latest satellite and ground-based observations have provided us a wealth of evidence of waves and oscillations present in the solar atmosphere from the low photosphere to the upper corona. Our understanding of the magnetically dominated structures and their dynamics in the solar atmosphere has been considerably enhanced in light of the latest high spatial and temporal resolution observations (e.g. DST/ROSA, IBIS, CoMP, SST/CRISP; SOHO,...
Prof. Robertus von Fay-Siebenberg
Univ. Sheffield
04/07/2013 - 14:30
The ALHAMBRA survey: First Data Release.
The ALHAMBRA (Advance Large Homogeneous Area Medium Band Redshift Astronomical; Moles et al. 2008) survey has observed 8 different regions of the sky, including sections of the COSMOS, DEEP2, ELAIS, GOODS-N, SDSS and Groth fields using a new photometric system with 20 contiguous, ~300A width, filters covering the optical range, plus deep JHKs imaging. The observations, carried out with the Calar Alto 3.5m telescope using the wide field...
Alberto Molino
27/06/2013 - 14:30
Dr. Sebastián Sánchez
20/06/2013 - 14:30
El Universo de Planck
Recientemente se han presentado los resultados cosmológicos de la misión espacial Planck. Es un buen momento para poner al día el valor de los parámetros del Universo. La nueva composición se resume en 26.8% materia oscura, 4.9% materia visible, 68.3% energía oscura. El valor de la constante de Hubble ha resultado también muy inferior a lo esperado: 67.5 km/(s Mpc). La conclusión m...
Prof. E. Battaner
13/06/2013 - 14:30
Love for Science or 'Academic Prostitution'?
Note: This is a seminar given at the European Research Council Headquarter some weeks ago. It was focused on the expected audience, members of the ERC directly involved in setting the rules for Grants evaluation and/or participate in all steps of the process, mainly Scientific Officers, but also Agency staff. I have decided to present the talk as it was presented there. Abstract: In a recent Special issue of Nature concerning Science...
Dr. Lourdes Verdes-Montenegro
06/06/2013 - 14:30
PAH's in Titan's Upper Atmosphere
Observations of Titan's atmosphere made with the VIMS instrument on board the Cassini satellite show a strong limb emission around 3.3 µm at high atmospheric altitudes (above 700 km). This emission exhibits the typical spectral signatures of the strong CH4 bands. A detailed analysis of the spectra reveals, however, an additional strong emission centered at 3.28 µm and peaking at about 950 km. We have untangled this spectral...
Prof. Manuel López-Puertas
23/05/2013 - 14:30
Extreme emission-line galaxies: New light on the mass assembly and chemical enrichment of low-mass galaxies
Galaxies showing early and significant stages of mass assembling are key objects for understanding galaxy evolution. However, young starbursts like these are extremely rare in the local Universe. In this context, a unique population of compact, low-mass galaxies forming stars at unusually high rates - also known as the "green peas" - emerge now as ideal laboratories to study the details of massive star formation, feedback and...
Dr. R. Amorin
16/05/2013 - 14:30
Hall motions and star escape in galactic dynamics in the Hill approach
The motion of a galactic cluster is approximately described by those equations in a co-moving frame, introduced by Hill in the XIXth century. Individual motions can only studied numerically, but  for the center of mass interstellar gravitational forces drop out and one is left with a simply system analogous to those considered by Hall for a planar electron in crossed electric and magnetic fields. In both cases, the motion of the COM is...
Dr. P. Horvathy
Lab. Math. Phys. Theor. Univ. Tours (France)
09/05/2013 - 14:30
The IAA COsmic DUst LABoratory, a lab next door (building).
MAIN GOALS of this talk: 1. Let you know/remind you that the IAA has a worldwide reference light scattering laboratory for experimentally studying the angular dependence of the scattering matrices of dust samples of astrophysical interest. 2. Convince the audience of: - Polarization is highly valuable tool for retrieving information on the physical properties of small cosmic dust particles. - How useful laboratory measurements...
Dr. O. Muñoz
25/04/2013 - 14:30
X-raying born-again planetary nebulae
Planetary nebulae have been a addition to the zoo of X-ray-emitting sources. Here I present results on a the very particular class of born-again planetary nebulae, those whose central star has experienced a helium shell flash during the lifetime of the planetary nebula. The interaction of the fast stellar wind of the central star with hydrogen-poor material ejected during the born-again episode provides a unique case to study...
Dr. M. Guerrero
18/04/2013 - 14:30
The Shortest-Known–Period Star Orbiting Our Galaxy’s Supermassive Black Hole
Stars with short orbital periods  at the centre of our Galaxy offer a powerful and unique probe of the nearest supermassive black hole. Observing these stars is a long-term astrophysical experiment that has been going on for two decades. In this talk I will outline this project and discuss the observational challenges and the strategies to overcome them. Steady technological and methodological advances allow us to improve...
Dr. Rainer Schoedel
11/04/2013 - 14:30
CALIFA: The spatially resolved Star Formation History of Galaxies
The Calar Alto Legacy Integral Field Area (CALIFA) is an ongoing 3D spectroscopic survey of 600 nearby galaxies of all kinds. This pioneer survey is providing valuable clues on how galaxies form and evolve. Processed through spectral synthesis techniques, CALIFA datacubes allow us to, for the first time, spatially resolve the star formation history of galaxies spread across the color-magnitude diagram. The richness of this approach is already...
Dr. R. González Delgado
04/04/2013 - 14:30
Probing Galaxy-Scale Halos and Large-Scale Structure with Weak Gravitational Lensing
The presence of dark matter in the Universe is well-established and contributes significantly to structures ranging from galaxies to superclusters. However, the details of the connection between luminous galaxies and the dark matter halos in which they reside are not particularly well-characterised. Weak gravitational lensing is the only direct probe that can measure the total mass profile associated with galaxies over a wide range of radii...
Dr. Ami Choi
Royal Observatory, Edinburgh
21/03/2013 - 13:30
The Javalambre-PAU Astrophysical Survey
  The Javalambre-PAU Astrophysical Survey (J-PAS) is a very wide field Cosmological Survey to be carried out from the Javalambre Observatory in Spain with a purpose-built, dedicated 2.5m telescope, using a set of 54 narrow band and 5 broad band filters over a 1.3Gpix, 5deg2 FOV camera. Starting in early 2015,  J-PAS will image 8500deg2 of Northern Sky and obtain 0.003(1 + z) precision photometric...
Dr. N. Benitez
14/03/2013 - 13:30
Towards a general classification of atmospheric waves on Venus
The atmospheric superrotation of Venus goes on being a puzzling phenomenon in the Solar system and is still considered an open problem in geophysicalfluid dynamics. A general agreement exists among numerous works concerning the main role that atmospheric waves should have in the generation and maintenance of the superrotation, although most of them try to study the impact of the waves with complex GCMs or using adapted terrestrial dispersion...
Dr. Javier Peralta Calvillo
06/03/2013 - 13:30
Hot Intergalactic Gas in Clusters of Galaxies
Clusters of galaxies are the most massive objects in our Universe. Each of them contains dark matter, thousands of galaxies and is filled with hot intergalactic gas radiating in X-rays. Unusual method to detect clusters of galaxies is possible due to presence of extremely isotropic Cosmic Microwave Background Radiation (CMB) filling our Universe. Interaction of hot electrons with CMB photons changes the CMB spectrum in the...
Prof. Rashid Sunyaev
Max-Planck-Institut für Astrophysik
27/02/2013 - 13:30
Mysteries and Discoveries from the Chandra Planetary Nebulae Suvery (ChanPlaNS)
Chandra observations of planetary nebulae (PNe) have ushered in a new wave of discoveries and mysteries in this class of evolved stars. The X-ray emission from PNe comes in two flavors: compact sources in the vicinity of the central star and extended sources that fill the nebular cavities generated during the PN formation process. The latter variety, called hot bubbles, are chemically-enriched with helium shell burning products (C, O, and Ne...
Dr. Rodolfo Montez
Bridge Post-Doctoral Fellow Vanderbilt University in Nashville, TN
21/02/2013 - 13:30
Local tadpole galaxies and cold-flows
Extremely metal poor galaxies are primitive objects attending to their chemical evolution. For reasons not well understood, they tend to have cometary or 'tadpole' morphology, with a bright peripheral clump ('the head') on a faint tail. Tadpole galaxies are rare in the nearby universe but turn out to be very common at high redshift, where they are usually interpreted as disk galaxies in early stages of assembling. If this...
Dr. Jorge Sánchez Almeida
Instituto de Astrofísica de Canarias
14/02/2013 - 13:30
Our Central Organization: Structure and Duties
More than 130 research centres and institutes, the IAA among them, belong to the Spanish Research Council (CSIC). The management of the Council is carried out by the Central Organization, in Madrid. With this talk I want to give an overview of the structure of our Central Organization and of the duties of its members.
Matilde Fernández Hernández
07/02/2013 - 13:30
Bajo un mismo cielo
"Bajo un mismo cielo” (“Under the same sky”) tells the story of the trip undertaken in 2009 by GalileoMobile. In a road trip that lasted two months and traveled around seven thousand kilometers, GalileoMobile visited schools and communities in Chile, Bolivia, and Peru to perform science activities and organize astronomical observations. Through children's eyes, an encounter from different visions and...
William Schoenell
31/01/2013 - 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
24/01/2013 - 13:30
Magnetic Effects and ovsersized M Dwarfs in the Young Open Cluster NGC 2516
By combining rotation periods with spectroscopic determinations of projected rotation velocity, Jackson, Jeffries & Maxted (2009) have found that the mean radii for low-mass M-dwarfs in the young, open cluster NGC 2516 are larger than model predictions at a given absolute I magnitude or I - K color and also larger than measured radii of magnetically inactive M-dwarfs. The relative radius difference is correlated with magnitude, increasing...
James MacDonald
University of Delaware
17/01/2013 - 13:30
Results from a stellar occultation by the dwarf planet Makemake
Pluto and Eris are icy dwarf planets with nearly identical accurately measured sizes, comparable densities, and similar surface compositions. Their different albedos and current distances from the Sun are likely reasons why Pluto possesses an atmosphere whereas Eris does not. Makemake, another icy dwarf planet with a similar spectrum to Eris and Pluto is currently at intermediate distance to the Sun between the two. Makemake’s size and...
José Luis Ortiz
13/12/2012 - 18:00
The P91 ESO OPC Meeting - What Matters in an ESO Proposal
I will give a brief summary of information obtained during my participation in the 91st meeting of the ESO Observing Programmes Committee, including the current and future availability of ESO instruments and telescopes and pending changes in ESO instrumentation. I will also briefly explain the proposal evaluation procedure and give you some tipps on how to write proposals for ESO time.
Rainer Schoedel
29/11/2012 - 13:30
Searches for young stars in the central region of our Galaxy
Star formation processes at the Galactic Center (GC) could differ significantly from the rest of the Milky Way because of factors like the high pressure and turbulence of the ISM, strong magnetic fields, and the presence of the supermassive black hole (SMBH). Understanding star formation in this region is interesting not only in it own right, but also as a  template for other galactic nuclei. Here I present results of three different...
Shogo Nishiyama
National Astronomical Observatory, Japan
26/10/2012 - 14:00
QSO outflows
The study of AGN feedback processes on the evolution of their host galaxies and their environments is a field of growing importance in the past years. One of the feedback mechanisms identified is high-velocity outflows in QSOs. In this talk, some results are presented based on observations of several QSOs, aimed to determine the importance of these outflows as feedback mechanisms.
J.Ignacio González Serrano
Dpto. de Física Moderna and IFCA, Universidad de Cantabria.
18/10/2012 - 14:30
Cosmological Challenges of Dwarf Galaxies
A prime challenge to our understanding of galaxy formation concerns the scarcity of dwarf galaxies compared with the numerous low-mass halos expected in the current ΛCDM paradigm. This is usually accounted for by assuming that energetic feedback from evolving stars confines dwarf galaxy formation to relatively massive halos spanning a narrow mass range. I will highlight a number of observations that may be used to test this assumption...
Julio Navarro
University of Victoria, Canada
04/10/2012 - 14:30
Hydrodynamical Models of Core-Collapse Supernovae
A set of hydrodynamical models applied to stellar evolutionary progenitors is used to study the nature of core-collapse supernovae (SNe).  For the type IIb SN 2011dh, our modeling suggests that a large progenitor star---with R ~200 R_sol--- is needed to reproduce the early light curves. This is consistent with the suggestion that a yellow super-giant star detected at the location of the SN in deep pre-explosion images is the progenitor...
Melina Bersten
IMPU, Tokyo University
27/09/2012 - 14:30
ASTRONET, a comprehensive long-term planning for the development of European astronomy
ASTRONET was created by a group of European funding agencies, including the Spanish ministry, in order to establish a strategic planning mechanism for all of European astronomy. It covers the whole astronomical domain, from the Sun and Solar System to the limits of the observable Universe, and from radioastronomy to gamma-rays and particles, on the ground as well as in space. ASTRONET aims to engage all astronomical communities...
Jesús Gallego
Universidad Complutense