Seminars
Scientific seminars exposed by scientists and technologists of the IAA and the many centers and research institutions who visit us. They show the intense scientific exchange, they are held at 12:30 every Thursday. Seminars are broadcasted live at IAA - CSIC Seminars Live.
For further information, please contact seminars (at) iaa.es.
Displaying 601 - 650 of 1243
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16/02/2010 - 12:00
Extragalactic research with the Virtual Observatory Nowadays, following years of technological development, Virtual Observatory standards, resources, and services became powerful enough to help astronomers making real science on everyday basis. An astronomer is able to combine ``online'' VO-enabled parts with ``offline'' research stages including dedicated data processing and analysis, observations, numerical simulations. I will present three VO-science projects combining VO and non-VO blocks,... Igor Chilingarian |
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11/02/2010 - 13:00
Observational constrains to galaxy evolution from the distribution of integrated stellar ages and metallicities in spiral galaxies I will present new results on the integrated stellar populations of bulges, bars and disks of spiral galaxies from long-slit spectroscopic observations. We have derived the ages and metallicities using both the whole spectra and stellar line-strength indices along the bar and bulges for a sample of 20 disk galaxies and derived the populations in the disks of four galaxies using GEMINI spectroscopic data. We find, in the distribution of stellar... Isabel Pérez Martín |
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04/02/2010 - 13:00
First results of the Fermi Large Area Telescope The Fermi Large Area Telescope (Fermi LAT) is a pair conversion telescope sensitive to photons in the energy range 30 MeV to >300 GeV. It was launched on June 11th 2008 and has now been successfully operating for over a year and made breakthrough discoveries in high energy astrophysics. In this seminar I will give an overview of the results from Fermi LAT and the implication it has had in astrophysics and astro-particle physics. Gudlaugur Johannesson |
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28/01/2010 - 13:00
The Galactic O-Star Spectral Survey (GOSSS) I present a large-scale spectral survey that is currently obtaining spectra of all known Galactic O stars down to B=13 with R=3000. The project includes additional observations of subsamples with [a] multi-epoch spectroscopy with R=40000, [b] flux-calibrated optical spectroscopy, and [c] high-spatial-resolution imaging. The main part of GOSSS is based on data from OSN, CAHA, and LCO. I will describe the current status of the survey and present... Jesús Maíz Apellániz |
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21/01/2010 - 13:00
The First 3mm Polarimetric Survey of Radio Loud AGN Relativistic jets in AGN are the most energetic and among the most powerful astrophysical objects known so far. Their relativistic nature provides them the ability to emit profusely in all spectral ranges from radio wavelengths to TeV gamma-rays, as well as abrupt variability in all time scales (from hours to years). After an extended review of the present knowledge of these objects, but paying particular attention to blazars, the main results... Iván Agudo Rodríguez |
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14/01/2010 - 13:00
Radio Supernovae: A Window into the Heart of Starburst Galaxies High-resolution radio observations of the nuclear regions of Luminous and Ultraluminous Infrared Galaxies (ULIRGs) have shown that their radio structure consists of a compact high surface-brightness central radio source inmersed in a diffuse low brightness circumnuclear halo. While the central components could be associated with AGNs or compact star-forming regions, where radio supernovae are exploding, it is well known that the circumnuclear... Antxón Alberdi |
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10/12/2009 - 13:00
eXtreme Multiplex Spectrograph for the 3.5m Calar Alto telescope We'll describe the design and science case for the XMS spectrograph at the prime focus of the 3.5-m Calar Alto telescope that can deliver at least 4000 MOS slits simultaneously over a 1-deg field. This extreme multiplex capability means that 25000 galaxy redshifts can be measured in a single night, opening up the possibilities for large galaxy redshift surveys out to z~1 to study galaxy evolution by estimating galaxy group and cluster masses,... Francisco Prada & Santiago Becerril |
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03/12/2009 - 13:00
Tracing dust at the edge of destruction: NIR observations of YSO transitional disks and nearby AGN with the Keck interferometer After a short introduction to modern infrared long baseline interferometry, I will present the results of two actual projects of mine, dealing with dust around stars and AGN. Based on observations with the Keck interferometer, we could show that the infrared-excess in transitional YSO class II disks typically derives from circumstellar disk material, and not from a close companion star. Disk dissipation induced by planet formation now appears to... Jörg-Uwe Pott |
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26/11/2009 - 13:00
GROND: A multi-channel imager on La Silla GROND stands for Gamma-Ray Burst Optical/Near-Infrared Detector. It is a 7-channel imager developed by the Max-Planck-Institut for extraterrestrial Physics in Garching, Germany, with contributions from the Thueringer Landessternwarte Tautenburg, Germany. GROND is mounted at the 2.2m telescope on La Silla since mid 2007. A short overview is given about the instrument, its operation, and its scientific achievements. Sylvio Klose |
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19/11/2009 - 13:00
CARMENES, a next-generation instrument for the CAHA 3.5-m telescope CARMENES is a study for a next-generation instrument for the 3.5m telescope at the Calar Alto Observatory that will be built by an international consortium. CARMENES stands for Calar Alto high-Resolution search for M dwarfs with Exo-Earths with a Near-infrared Echelle Spectrograph. Since M dwarfs have low effective temperatures (Teff < 4000 K), our spectrograph is designed to operate in the optical red and the near infrared, where they emit... Pedro J. Amado |
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12/11/2009 - 13:00
An extremely prolific supernova factory in the buried nucleus of a starburst galaxy Tbd Miguel Ángel Pérez Torres |
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05/11/2009 - 13:00
ESO: a brief overview Based on talks presented at the "Jornada ESO 2009", held on 22 September 2009, I will provide a brief overview of some statistical data related to ESO and particularly the role of Spain within ESO. I will also provide a brief overview of the current status of ESO telescopes and available instruments as well as upcoming developments, like ALMA/E-ELT. Rainer Schoedel |
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29/10/2009 - 13:00
PANIC: current status We will present the current status of the PANIC project. This instrument will be the first to be built inside the Spanish-German consortium signed between MPIA and IAA for the development of new instrumentation for the Calar Alto Observatory. PANIC is a wide-field infrared imager for the Ritchey-Chrétien focus of the Calar Alto 2.2m and 3.5m telescopes. The camera optical design is a folded single optical train that images the sky onto the focal... Matilde Fernández, Julio F. Rodríguez, Conchi Cárdenas y José M. Ibáñez |
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22/10/2009 - 14:00
Light Scattering in the Solar System A concise survey of light scattering by small dust particles in the atmospheres and surface layers of various Solar System bodies, comets, the interplanetary medium, and in planetary rings is presented. Current issues and recent developments are emphasized. Special attention is given to experimental and numerical approaches for solving problems of light scattering by non-spherical dust particles. Key areas for further research are pointed out... Prof. J.W. Hovenier |
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15/10/2009 - 14:00
Las variables luminosas azules de la Gran Nube de Magallanes en acción: La evolución estelar masiva en tiempo real Las dos estrellas mas brillantes de la LMC en este momento son dos VLA en estado de erupción. Radcliffe 127 (R127) había sido una estrella de tipo Ofpe antes de 1980. En 1982 se descubrió que estaba entrando en una erupción de VLA, enseñándonos por primera vez la relación entre esos dos tipos de objetos peculiares. Estos eventos consisten en una expansión de la estrella y/o un eyección de una capa que reprocesa la luz ultravioleta hacia el rango... Nolan Walborn |
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24/09/2009 - 14:00
he central parsec of the Milky Way: shocks, outflows and young stars Both a dense stellar cluster and streamers of gas and dust coexist within the central parsec of the Milky Way Galaxy, in the deep potential well of the 4 million MSun black hole at the position of the radio source SgrA*. A number of features in the local interstellar medium (ISM) reveal that there is a great deal of interaction going on at the Galactic Center (GC), building up evidence for the existence of outflow(s) in the central 0.5 pc. The... Koraljka Muzic |
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17/09/2009 - 14:00
Oscurecimiento en LINERs Tbd. Josefa Masegosa Gallego |
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10/09/2009 - 14:00
8 meses del Año Internacional de la Astronomía 145 países participantes. En España, más de 2000 actividades ya celebradas y más de 1000 entidades participantes. Tras ocho meses de celebración, y gracias a la implicación de miles de personas, el Año Internacional de la Astronomía ha dado lugar a la mayor red de divulgación científica que ha existido nunca. Hablaré de la evolución que ha seguido esta conmemoración durante este periodo, las principales iniciativas que se han impulsado a nivel... Montserrat Villar Martín |
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02/07/2009 - 14:00
Sunrise: una revisión previa a la ciencia En esta charla pretendo dar una visión global de la misión Sunrise, de sus propósitos científicos y de su desarrollo tecnológico. En particular me centraré en IMaX, el magnetógrafo solar en el cual ha participado con éxito el IAA (CSIC), tanto en su definición científica como siendo responsable de toda la electrónica y software del instrumento. Describiré aspectos del diseño y fabricación, así como presentaré abundante material gráfico de la... José Carlos del Toro Iniesta |
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25/06/2009 - 14:00
Asteroids as the parent bodies of meteorites: compositional differences and size-dependent transport mechanisms Asteroids that come close to the Earth´s orbit (near-Earth asteroids, or NEAs) are targets of different sample-return space missions, providing us with material from their surfaces. Besides, we can also analyze the composition of meteorites in the laboratory, and run dynamical models that give us information about the source regions of NEAs and, consequently, the meteorites. By means of mineralogical analysis of their reflectance spectra,... Julia de León Cruz |
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18/06/2009 - 14:00
25/20: The 25 greatest discoveries in astronomy and astrophysics of the 20th century I will present my personal list of the 25 most important and influential discoveries in astronomy of the 20th century. I will analyse the papers that reported these discoveries by the year they occurred, the age of the discoverers and the country where the people worked. The decades 1911-20 and 1960s were the most productive of the 20th century, in spite of the arrival of computers and observatories in space. I suggest reasons for the decline in... Prof. John Hearnshaw |
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21/05/2009 - 14:00
Comparing High and Low Redshift Quasar Properties: Black Hole Masses and Eddington Ratios Black hole mass and Eddington ratio estimates for quasars are of fundamental interest to astrophysicists and cosmologists. Comparisons of high and low redshift quasar properties are of special interest. Past comparisons have been unreliable because estimates are based upon measures of different emission lines in different redshift ranges. Are all broad emission lines valid virial estimators? Evidence suggests not motivating us to follow Hbeta... Jack Sulentic |
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30/04/2009 - 14:00
PINGS: the PPAK IFS Nearby Galaxies Survey I will present the PPAK Integral Field Spectroscopy (IFS) Nearby Galaxies Survey: PINGS, a 2-dimensional spectroscopic mosaicking of 17 nearby disk galaxies in the optical wavelength range. This project represents the first attempt to obtain continuous coverage spectra of the whole surface of a galaxy in the nearby universe. The final data set comprises more than 44000 individual spectra, covering an observed area of nearly 80 arcmin squared.... F. Rosales-Ortega |
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23/04/2009 - 14:00
CdC-SF: A precise proper motion catalogue from 'Carte du Ciel' plates, San Fernando Zone I will present an astrometric catalogue of positions and proper motions derived from the "Carte du Ciel" plates, San Fernando zone, which has a mean epoch 1901.4 and a limiting magnitude V~15. Digitization has been made using a conventional flatbed scanner. Special techniques have been developed to handle the combination of plate material and the large distortion introduced by the scanner. A variety of post-scan corrections are shown... Belén Vicente |
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16/04/2009 - 14:00
Can we find Earth-mass planets orbiting our nearest star, alpha centauri? I will describe a new program at Mt John that aims to find Earth-mass planets orbiting either alpha Cen A or B, which are solar type stars in a well known binary. We are measuring precise radial velocities using the Hercules spectrograph, which I will describe. At least 10000 spectra at S/N ~ 500:1 giving 1 m/s precision will be needed. Theoretical studies show that Earth mass planets can have stable orbits to 3 AU and that such planets will... Prof. John B. Hearnshaw |
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31/03/2009 - 14:00
Extended Emission Line Regions around radio-quiet QSOs It was noted soon after the discovery of the first quasars that some of them were surrounded by a nebulosity. Narrow-band imaging surveys and spectroscopic studies of quasars by Stockton et al. and Boroson et al. in the 1980s revealed that these nebulosities originated from extended emission-line regions (EELRs) where gaseous material is kept photoionized by the quasar. Since most of these quasars are radio-loud ones, it has been thought that... Bernd Husemann |
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26/03/2009 - 13:00
Misión espacial Kepler. Planetas y Estrellas: Oferta 2x1 En los últimos años se han lanzado dos misiones espaciales CoRoT (CNES, ESA) y Kepler (NASA) que presentan objetivos científicos. Por un lado, buscar exoplanetas, i.e. planetas fuera del Sistema Solar, aquellos que se encuentran en la zona habitable (planetas en lo que pueda haber agua en estado líquido). Y por otro lado, observar estrellas para estudiar su estructura interna y evolución, haciendo uso de la Astrosismología. En esta charla... Juan Carlos Suárez |
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19/03/2009 - 13:00
Spacetime and Noncommutative Geometry This talk, which is intended for non-specialists and makes particular emphasis on astrophysical/cosmological implications, will review the underlying physical motivations for the suggestions that spacetime is noncommutative. Causality violations are implied by such noncommutativity and that leads to physical effects. It also leads to Pauli principle violations and forbidden transitions, and to observable effects in CMB temperature spectrum.... A. P. Balachandran |
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12/03/2009 - 13:00
El Universo visto por las Astrónomas La Astronomía moderna no se puede concebir sin el trabajo realizado por todas aquellas mujeres que con su dedicación y amor a la ciencia nos han dejado su legado. A pesar de la práctica inexistencia de documentación bien estructurada sobre su papel en la historia de la Astronomía, los datos existentes muestran que ha existido un buen número de mujeres que con sus trabajo de investigación han contribuido a la concepción que hoy tenemos del... Josefa Masegosa Gallego |
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11/03/2009 - 13:00
SpIOMM: An imaging Fourier transform spectrometer in the visible for astronomical observations Attached to the 1.6-meter telescope of the Observatoire du Mont Mégantic in southern Québec, SpIOMM is an imaging Fourier transform spectrometer designed to obtain the visible range (350 – 850 nm) spectrum of every astronomical light source in a circular field of view of 12 arcminutes in diameter. I will present some results of four recent successful observing runs, which highlight SpIOMM’s capabilities to map emission line objects... Gaetan Perron |
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26/02/2009 - 13:00
Very High Energy Gamma-Ray Astrophysics with MAGIC The MAGIC-I telescope is currently the largest single-dish Imaging Atmospheric Cherenkov telescope in the world. A second telescope, MAGIC-II, will upgrade MAGIC-I in sensitivity, angular and spectral resolution from this year on. I shall describe the Cherenkov telescope detection technique, the astrophysical topics of interest in this brand new astronomical window and the results of the last four years of observation with the MAGIC telescope... Juan Cortina |
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19/02/2009 - 13:00
Panchromatic analysis of the star formation processes in M33 The spiral galaxy M33 belongs to the local group and allows us to study star formation processes with great accuracy. The Spitzer telescope reaches spatial resolutions of the order of some parsecs and reveals the interactions between young stars and the interstellar medium. A detail analysis focussed on the typical colours of discrete sources such as HII regions, planetary nebulae and supernovae remnants. Also, we estimated the star formation... Simon Verley |
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29/01/2009 - 13:00
Charlas DEA / TIT En el camino hacia ALMA: técnicas de calibración de fase y gas molecular en grupos compactos de galaxias Vicent Martínez i Badenes (IAA-CSIC) En esta charla presentaré la preparación que llevo a cabo desde un punto de vista tanto científico como técnico de cara a ALMA. Las turbulencias en el vapor de agua en la troposfera producen decorrelación en la señal en los interferómetros milimétricos/submilimétricos. Aun habiendo varias técnicas de... Vicent Martínez y Walter Savolo |
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22/01/2009 - 13:00
What can we learn from synthetic emission maps for the jet of M87? We present a self-consistent MHD model for the jet of M87. The model consist of two distinct zones: an inner relativistic outflow and an outer cold disk-wind. While the former does not self-collimate efficiently due to its high effective inertia, the latter fulfils all the conditions for efficient collimation by the magneto-centrifugal mechanism. The relativistic flow is thus magnetically confined into a well collimated beam for a wide range of... José Gracia |
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15/01/2009 - 13:00
The retired galaxies Tbd. Roberto Cid Fernandes |
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08/01/2009 - 13:00
Modelisation of the variability of TeV blazars with a stratified jet model We present a new time-dependent inhomogeneous jet model of non-thermal blazar emission, which reproduces the entire spectral energy distribution together with the rapid gamma-ray variability. Ultra-relativistic leptons are injected at the base of a jet and propagate along the jet structure. We assume continuous reacceleration and cooling, producing a relativistic quasi-maxwellian (or "pile-up") particle energy distribution. The... Timothe Boutelier |
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18/12/2008 - 13:00
Las edades relativas de los cúmulos globulares: consecuencias sobre la escala temporal de la formación de la Vía Láctea Nuestro grupo ha utilizado 130 órbitas del HST/ACS para obtener diagramas color-magnitud profundos de 65 cúmulos globulares de la Vía Láctea ("Treasury Project on Galactic Globular Clusters"). Estos datos nos han permitido obtener las edades relativas de estos objetos con una precisión superior a la que disponíamos hasta ahora y deducir información relevante sobre el proceso de formación de la Vía Láctea y la escala temporal en que se... Antonio Aparicio |
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11/12/2008 - 13:00
The interplay of gas and stars in nearby galaxies To understand the evolution and appearance of galaxies it is crucial to study the interplay between stars and the interstellar gas and dust. I will present results and plans to study the ISM and star formation in the nearby galaxies M51 and M33. For M51, we combined maps of the molecular and atomic gas to derive the total gas surface density. Taking into account the velocity dispersions of the molecular and atomic gas, and the stellar surface... Carsten Kramer |
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04/12/2008 - 13:00
Fulguraciones en una nueva fuente galáctica: ¿el eslabón perdido entre los magnetares y las estrellas de neutrones aisladas? Las apariencias engañan. El 10 de junio de 2007 el satélite SWIFT descubrió lo que aparentemente era otro estallido de rayos gamma en la dirección de la Via Láctea. El comportamiento observado horas después apuntaba a una naturaleza bien distinta, observándose 40 fulguraciones ópticas durante los tres días siguientes antes de desaparecer. Observaciones multirrango realizadas durante meses han confirmado su origen en nuestra Galaxia, siendo... Alberto Castro Tirado |
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27/11/2008 - 13:00
Simulating Reionization: Yesterday, Today, and Tomorrow Cosmic reionization - the process of ionization of the bulk of cosmic gas by ultra-violet radiation from primeval galaxies - is by far the most dramatic event that occurred in the universe since the formation of the first star. I will give a very personal and highly biased view on the recent progress in modeling reionization with numerical simulations, and will discuss a possible avenue for catching the next big prize in numerical cosmology.... Nick Gnedin |
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20/11/2008 - 13:00
Physical parameters of T dwarfs derived from high-resolution near-infrared spectroscopy I present a study aimed at determining the effective temperature and surface gravity of a sample of nine T-type field T dwarfs from the comparison of high-resolution near-infrared spectra and synthetic models. The spectra were obtained with NIRSPEC, using ten echelle orders to cover part of the J-band with a resolving power R~20,000. The AMES-COND cloudless solar metallicity models used here were obtained using the PHOENIX code. The modelled... Carlos del Burgo |
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30/10/2008 - 13:00
AMIGAs sin amigas Aunque es bien conocido que la historia evolutiva de las galaxias está fuertemente condicionada por el entorno, la evidencia observacional no es siempre suficientemente clara o concluyente. Por ello la definición de galaxia aislada es crucial para poder comprender la historia y propiedades de las que no lo están. En 2003 comenzamos en el IAA el proyecto AMIGA (Analisis del Medio Interestelar de Galaxias Aisladas) centrado en la construcción y... Lourdes Verdes Montenegro |
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16/10/2008 - 14:00
The hub of the wheel - the nuclear star cluster of the Milky Way Nuclear star clusters (NSCs) are present at the photometric and dynamical centers of the vast majority of galaxies. They are the densest known clusters in the Universe. Unfortunately, extragalactic NSCs can be barely resolved, even by the HST or ground based adaptive optics observations. This makes the NSC at the center of the Milky Way is a unique target because it can be resolved into tens of thousands of individual stars using current... Rainer Schödel |
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09/10/2008 - 14:00
Fulguraciones en una nueva fuente galáctica: ¿el eslabón perdido entre los magnetares y las estrellas de neutrones aisladas? Tbd. Alberto Castro-Tirado |
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02/10/2008 - 14:00
Por determinar Tbd. Almudena Alonso-Herrero |
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25/09/2008 - 14:00
Gamma-Ray Bursts and Puzzles of Core-Collapse Supernovae Discovery of relation between long-duration gamma-ray bursts (GRBs) and supernovae (SNe) is the most important progress in this domain during recent 10 years. Now the search for SNe signs in photometry and spectra of GRB aftrdglows became the main observational direction both for large ground-based telescopes and space platforms. In particular, in the process of study, a new branch of observational cosmology has arisen as a result of... V. V. Sokolov |
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18/09/2008 - 14:00
'Hinode' A New Solar Observatory in Space Since its launch in September 2006, Japan-US-UK solar physics satellite, the Hinode, has continued its observation of the sun, sending back solar images of unprecedented clarity every day. The Hinode is equipped with three telescopes, visible light telescope, X-ray telescope, and extreme ultraviolet imaging spectrometer. The optical telescope has a large primary mirror measuring 50 centimeters in diameter, and is the world’s largest space... Dr. Saku Tsuneta |
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04/09/2008 - 14:00
Final Optical Design of PANIC, a Wide-Field Infrared Camera for CAHA Se presentará el estado actual en que se encuentra PANIC (PAnoramic Near Infrared camera for Calar Alto), la nueva cámara infrarroja de gran campo para el telescopio de 2.2 m de CAHA. Este instrumento será el primero que se construya dentro del consorcio Hispano-Alemán firmado entre el MPIA y el IAA para el desarrollo de nueva instrumentación para el Observatorio de Calar Alto. El diseño óptico final es un monobrazo, totalmente refractivo, que... Conchi Cárdenas |
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24/07/2008 - 14:00
Espectros multifrecuencia, multiplicidades y ambientes de las estrellas más masivas Se repasarán las tendencias y correlaciones entre los espectros de tipo O normales en los rangos visible, ultravioleta y rayos X. El último de éstos es una sorpresa reciente para muchos especialistas, al establecer importantes condiciones de contorno sobre el origen físico de las emisiones de rayos X. También se presentarán algunas categorías peculiares, incluyendo [a] la Of?p, dos de cuyos miembros son de las pocas estrellas de tipo O con campo... Nolan Walborn |
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17/07/2008 - 14:00
The dynamical state of brightest cluster galaxies and the formation of clusters A large sample of Abell cluster of galaxies, selected for its likely presence of a dominant galaxy, is used to study the dynamical properties of their brightest cluster members (BCMs). From visual inspection of Digitized Sky Survey images combined with redshift information we identify 1430 candidate BCMs located in 1223 different redshift components associated with 1171 different Abell clusters. This is the largest sample published so far of... Roger Coziol |