Seminars
Displaying 51 - 100 of 1222
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16/11/2023 - 12:30
SO Colloquium: The evolution of the accretion process: investigating the protostellar phase to constraints planet formation The accretion process is responsible for the mass building during the star formation phase, but our knowledge of this phenomenon is still not totally understood. On one side, the magnetospheric accretion scenario describes the accretion on pre-main sequence (Class II/III) low-mass stars. However, most of the material is supposed to be accreted during the earliest stages, i.e. the protostellar phase (Class 0/I), when the forming star and its disk... Dr. Fiorellino, Eleonora |
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09/11/2023 - 12:00
Studying magnetic fields, dynamics, and fundamental physics near a black hole with current and future mm-VLBI instruments The Event Horizon Telescope (EHT) has imaged the black hole shadows of the supermassive black hole at the center of the galaxy M87 (M87*) and at the center of the Milky Way (Sgr A*). Polarimetric imaging of M87* with the EHT enabled significantly stronger inferences on the black hole and accretion parameters than total intensity data alone. Geometric modeling was a central tool for studying the structure of M87* and Sgr A* in total intensity. In... Dr. Freek Roelofs |
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31/10/2023 - 12:30
Outflows from low to high luminous AGNs Outflows are believed to play a major role in the evolution of galaxies and are said to be ubiquitous within the active galactic nuclei (AGN) population. However, we still lack a comprehensive view of their properties and impact in their host galaxies and the surrounding medium. If we focus on the low luminosity part of the AGN family, in particular in low ionisation nuclear emission-line regions (LINERs), the impact of outflows is still largely... Laura Hermosa Muñoz |
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26/10/2023 - 12:30
SO Colloquium: Multi-fluid solar chromosphere The solar chromosphere is the boundary layer between the interior and exterior of the Sun, routing the origins of the coronal heating. New large-aperture solar telescopes, such as the future 4-meter European Solar Telescope or American DKIST, have among their primary focus observations of chromospheric magnetic fields. The correct interpretation of solar data requires sophisticated theories. The solar chromosphere is made of strongly stratified... Dr. Elena Khomenko |
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24/10/2023 - 13:00
The Galactic Center seen with MeerKAT During its inauguration, the MeerKAT released, to date, the most detailed image of the centre of the Galaxy at L-band (1.28 GHz). Since then, the data have been exploited for various scientific research. One such exploitation was to produce a high resolution mosaic of the Galactic centre. From this mosaic came a catalogue of newly discovered unresolved point sources. Over 1500 sources were identified, of which 20 are steep spectrum point... Dr. Isabella Rammala |
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19/10/2023 - 17:00
SO Webloquium: Feeding and Feedback: How to Make a Starburst and What that Means for the Host Galaxy The cycle of star formation governs the evolution of galaxies. In some local galaxies, the star formation rate in their centers are much higher than other normally star-forming galaxies and may be more similar to galaxies at earlier cosmic times. I present observational results from two archetypal nearby starburst galaxies: NGC253 and M82. First, I will discuss how gas flows to the center of NGC253 along its bar to fuel the extreme burst of... Dr. Rebecca C. Levy |
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09/10/2023 - 12:30
SO Colloquium: The demographics of small exoplanets The diversity of the exoplanet population is beyond our imagination. The more than 5000 known exoplanets vastly differ in mass, size, orbital period, dynamics, and host type. Demographic studies, however, aim to find patterns in the population that inform us about their origin, composition, and evolution. Among these features, perhaps the most surprising is the abundance of planets with no analog in the solar system, also known as sub-Neptunes.... Dr. Rafael Luque |
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05/10/2023 - 12:30
SO colloquium: A Light in the Dark - Massive Star Birth Through Cosmic Time Massive stars are important throughout the universe, but their formation remains poorly understood. I review current understanding of how massive stars form in our Galaxy, in particular examining observational tests of various predictions of Core Accretion and Competitive Accretion theories. Finally, I discuss how massive star formation may have been different in the very early universe and how the first stars may have become supermassive... Dr. Jonathan C. Tan |
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03/10/2023 - 12:30
Young massive clusters in the Gaia era After the detection of gravitational waves and the realisation of the wide diversity among core-collapse supernova explosions, Interest in massive stars has been rekindled. Young open clusters are our natural laboratories to explore the lives and deaths of massive stars, and most of our current understanding comes from their study. Until recently, we have been strongly limited by practical difficulties and small number statistics. Most open... Dr. Ignacio Negueruela |
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28/09/2023 - 12:30
A VLTI view of Massive Young Stellar Objects (MYSOs) The formation of massive stars, objects with masses larger than 8 times solar, is central to both stellar astronomy and galactic evolution. In recent years, significant progress has been made in understanding the formation of high-mass young stellar objects (MYSOs; i.e. M∗ ≥ 8 M⊙, Lbol ≥ 5 x 103 L⊙. The latest observational and theoretical studies present evidence that HMYSOs are born in the same way as their low-mass counterparts, via disc... Dr. Maria Koutoulaki |
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26/09/2023 - 12:30
Coloquio SO: Extracting stellar populations and (mainly) emission line information out of S-PLUS photometry We present tests of a new method to simultaneously estimate stellar population and emission line (EL) properties of galaxies out of S-PLUS photometry. The technique uses the AlStar code, updated with an empirical prior which greatly improves its ability to estimate ELs using only the survey's 12 bands. The tests compare the output of (noise-perturbed) synthetic photometry of SDSS galaxies to properties derived from previous (STARLIGHT-based)... Dr. Roberto Cid Fernandes |
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21/09/2023 - 12:30
SO Colloquium: Testing black hole structure with very-long-baseline interferometry Black holes hold a tremendous discovery potential, and experiments such as the Event Horizon Telescope and its next generation upgrade could provide important cues about their structure. New physics beyond general relativity can modify the structure of black holes and leave imprints on image features, for instance changing the separation between photon rings or generating additional sets of photon rings. Both cases motivate the study of the... Dr. Raul Carballo |
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14/09/2023 - 12:30
X-ray emission from Symbiotic Stars: a stellar window to the Astrophysics of AGN Symbiotic stars (SySts) are binary systems in which a white dwarf (WD) accretes material from a red giant star. X-ray studies of SySts reveal an apparent variety of processes which would suggest different origins. In this talk I will briefly review our current knowledge of the X-ray properties of SySts (their classification and physical parameters), in particular I will describe the iconic systems R Aqr and CH Cyg. Finally I will present our... Dr. Jesús Toalá |
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20/07/2023 - 12:30
Near-Infrared Observations of Clustered Massive Star Formation in Outflowing Region AFGL 5180 Massive stars are significant throughout the universe, as they impact their surroundings from the early stages of their formation until they die in the form of supernova. Observations in the near-infrared (NIR) of the bright and large-scale (~pc) jets which young stars ubiquitously produce during their formation process can place important constraints on the phenomenon of massive star formation. Here, we present a detailed NIR view of the star-... Sam Crowe |
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13/07/2023 - 11:00
Solar Orbiter: An example of an international collaboration Solar Orbiter is a space mission of international collaboration between ESA (European Space Agency) and NASA. Solar Orbiter was launched on February 9th 2020 from Cape Canaveral, FL onboard of an Atlas V 411 rocket. This event signified the success of the diplomatic, economical, technological, and scientific effort of many countries and two space agencies to achieve a common goal. The outcomes from this mission will aid to the scientific... Dr. Teresa Nieves Chinchilla |
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06/07/2023 - 13:00
La acreditación Severo Ochoa-IAA 2023-2027 To be provided Dr. Isabel Márquez |
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28/06/2023 - 12:30
Un universo de diversidad: historias LGTBI en el mundo de la razón y la ciencia El neurólogo Ben Barres, que murió hace unos pocos años, escribió un texto en Nature muy interesante sobre ciencia y género y en él decía: "The progress of science increasingly depends on the global community, but only 10% of the world’s population is male and caucasian. To paraphrase Martin Luther King, a first-class scientific enterprise cannot be built upon a foundation of second-class citizens." Él era transexual. El mundo de la ciencia,... Dr. Javier Armentia |
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22/06/2023 - 12:30
SO colloquium: X-ray Polarimetry: a New Window to the Universe Polarimetry is a very important technique for understanding magnetic fields and high-energy processes in the Universe. While we have been studying polarization in the radio and optical side of the electromagnetic spectrum for decades, what happens at higher energies has, until recently, eluded us. In 2021 NASA finally launched the first X-ray polarimeter, the Imaging X-ray Polarimetry Explorer - IXPE, offering us a completely new window to the... Dr. Yannis Liodakis |
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20/06/2023 - 12:30
Radio continuum halos in nearby galaxies and the CHANG-ES project About a decade ago, the upgrade from the classic Very Large Array into the EVLA, i.e. the Karl G. Jansky Very Large Array (VLA), made it possible to observe fainter radio continuum emission than ever before. The project Continuum Halos in Nearby Galaxies - an EVLA Survey (CHANG-ES, PI: J. Irwin) has allowed us to probe gaseous halos of 35 edge-on galaxies with arcsecond details and faint microJansky/beam sensitivities, and to begin answering... Theresa Wiegert |
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06/06/2023 - 12:30
Aperture Masking Interferometry with the JWST In this talk, I will present how the aperture masking interferometric (AMI) mode of the JWST works. I will describe the main characteristics of this mode. In particular, I will show some of the advantages of the mode complementary to standard imaging and coronagraphic observations. I will also introduce the basic principles of the AMI data analysis, including the extraction of the interferometric observables and their interpretation with... Dr. Joel Sanchez Bermudez |
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01/06/2023 - 12:30
SO webloquio: The impact of stellar composition: from galactic chemical evolution to planet formation The characterization of solar-type stars is fundamental for various fields in astrophysics, including exoplanet detection and the chemical evolution of our Galaxy. In particular, the determination of chemical abundances for stars at different metallicities and ages provides us with a key insight on how and when the various chemical elements were formed within the Galaxy. The chemical trends observed in different parts of the Galaxy (thin disk,... Dr. Elisa Delgado Mena |
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25/05/2023 - 12:30
SO colloquio: To be black, or not? Observational tests of strong field gravity are improving rapidly. This allows us to test whether the compact objects observed in the sky are truly black holes as described in general relativity or some other "exotic" objects. These tests, however, require exquisite theoretical modeling of black holes as well as their alternatives. This talk will discuss two such examples: the impact of the astrophysical environment on black holes and the... Dr. Béatrice Bonga |
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16/05/2023 - 12:00
Seminario Centro de Cálculo Nueva infraestructura de cálculo del IAA Centro de Cálculo |
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11/05/2023 - 12:30
Off-centre supermassive black holes in bright central galaxies Supermassive black holes (SMBHs) are believed to reside at the centre of massive galaxies such as brightest cluster galaxies (BCGs), the most massive galaxies which can be found in today's Universe. However, as BCGs experienced numerous galaxy mergers throughout their history, the central BH can be significantly kicked from the central region by these dynamical encounters. By combining the Illustris-TNG300 simulations and orbital integration... Dr. Aline Chu |
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04/05/2023 - 12:30
SO colloquio: Pulsar astrophysics in the era of large surveys History tells us that with new telescopes and new data processing techniques come new discoveries and breakthroughs in pulsar astrophysics. Despite nearly 55 years since their discovery, fundamental open questions remain in almost all areas of research. Examples include the birth properties and environments, the magnetic field configuration and evolution, the interactions of the superfluid interior with the solid crust, the processes of... Dr. Aris Karastergiou |
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27/04/2023 - 12:00
El Futuro de la Astrofísica de muy altas energías a través del Open Science: Oportunidades con el Cherenkov Telescope Array Observatory (CTAO) El jueves 27 de abril a las 12:00 CEST, el Cherenkov Telescope Array Observatory (CTAO) y el Instituto de Astrofísica de Andalucía (IAA-CSIC) celebrarán un evento gratuito y abierto para investigadores interesados en la Ciencia Abierta y posibles sinergias con el CTAO, así como para estudiantes de grado, máster y doctorado que deseen desarrollarse profesionalmente en el campo de la Astrofísica de muy altas energías. El seminario, que tendrá... Dr. Roberta Zanin, Dr. Juan Cortina, Dr. Rubén López Coto y Dr. Francisco Colomer |
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25/04/2023 - 12:30
SO colloquio: Theoretical models for the formation and evolution of Ultra-Cool Dwarf planetary systems Rocky planets located in the habitable zones around very low-mass objects are ideal targets for searching for life outside our Solar System. In order to better understand their formation and evolution, N-body simulations are needed. These simulations are developed assuming a star close to the substellar mass limit as the central object. The simulations include tidal and general relativistic effects that incorporate the contraction and evolution... Dr. Mariana Sánchez |
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21/04/2023 - 12:30
Gamma rays as cosmic ray tracers: how can CTAO contribute to the cosmic ray physics Gamma-ray emission produced by interactions of cosmic rays with interstellar matter and radiation fields is a probe of non-thermal particles in galaxies. After decades of instrumental improvements in the field of gamma-ray astronomy, different scales and environments are now accessible and their gamma-ray observations reveal several properties of cosmic rays, especially in our Galaxy. I will provide a short review of the status of the subject... Roberta Zanin |
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13/04/2023 - 12:30
Coloquio SO: A holistic approach to exoplanet spectroscopy During the last two decades, multiple observation techniques have enabled the study of exoplanet atmospheres, informing us about their chemical composition, thermal distribution and transport processes. The most successful techniques include low-resolution transit and eclipse spectroscopy, phase curves, and high-resolution Doppler spectroscopy. In all cases, the extraction of the atmospheric signal presents a challenge, being comparable to or... Guiseppe Morello |
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30/03/2023 - 12:30
Preparation and Asteroseismic exploitation of the PLATO Mission Thanks to ultra-precise space missions, we are living an era of big scientific discoveries in the stellar and planetary physics fields. PLATO will capitalise on the developments of successful past missions such as CoRoT, Kepler/K2, TESS and CHEOPS that studied stars and their planetary systems. PLATO will detect and characterise terrestrial exoplanets at orbits up to the habitable zone of solar-type stars. Transit measurements and... Dr. Javier Pascual |
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28/03/2023 - 12:30
International Asteroid Impact Defense Collaboration The defense of our planet against asteroid impacts counts on international collaboration. NASA's OSIRIS-REx and Japan's Hyabusa2 spacecraft studied two potentially hazardous asteroids Bennu & Ryugu and bring samples back to Earth. NASA's DART, Italy's LICIACube and ESA's Hera spacecraft test a method of planetary defense against asteroids. Dr. Humberto Campins |
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23/03/2023 - 12:30
SO coloquio: Investigating the impact of quasar feedback on the central kiloparsecs of galaxies Active galactic nuclei (AGN) feedback is the effect that nuclear activity produces in the interstellar and circumgalactic medium of galaxies. Different modes of AGN feedback, which can be broadly divided into radiative/quasar and kinetic/radio, are now considered key processes in the evolution of massive galaxies by regulating black hole and galaxy growth. Indeed, a wealth of observational evidence demonstrates that feedback from supermassive... Dr. Cristina Ramos Almeida |
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16/03/2023 - 12:30
An observational study of massive star forming regions at radio wavelengths In their early stages, massive stars have a profound impact on their hosting cloud as reflected by signposts like shocks, bars and shells of swept material resulting from prominent stellar winds, or photo-ionized (HII) regions produced by energetic irradiance. This activity must be taken into account in the study of the mechanism of formation of either massive stars or nearby lower mass companions affected by such harsh conditions. It is known... Josep Maria Masqué |
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09/03/2023 - 12:30
When accretion is as vital as extreme: from massive young stars to binary black holes Accretion is vital for understanding the properties of a number of astrophysical objects, including massive young stars and black holes. For the former, accretion drives the stellar mass growth and multiplicity through gas fragmentation. It also powers strong outflows that regulate the interstellar medium. For black holes, only accretion allows for electromagnetic detection. Hence, the multi-messenger astronomy, for which the loudest sources of... Dr. Raphael Mignon-Risse |
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07/03/2023 - 12:30
Sub-milliarcsecond astronomy with Imaging Atmospheric Cherenkov Telescopes The angular size of a star is a critical factor in determining its basic properties. Together with the distance, it provides the physical diameter of the star which can be used to yield luminosity and mass estimates. Direct measurement of stellar angular diameters is difficult: at interstellar distances stars are generally too small to resolve by any individual imaging telescope. This fundamental limitation can be overcome by several methods... Dr. Tarek Hassan |
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02/03/2023 - 12:30
J-PAS: a survey for tracing the role that star formation and environment play in galaxy evolution The processes that explain the evolution of galaxies from the blue cloud to the red sequence are still under discussion. Internal processes, named as mass-quenching, because they are linked to the galaxy mass or AGN feedback, could be responsible of the rapid quench of the star formation in galaxies. Besides the stellar mass, the evolution of the galaxy populations is also a function of the environment. Unlike the mass quenching, the... Dr. Rosa González Delgado |
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23/02/2023 - 12:30
ALMA: Planned Sensitivity Upgrades, and Molecular Gas Imaging of a z=0.376 HI-Detected Galaxy This talk will cover two distinct topics in progress, one programmatic and the other science: I will first discuss the ALMA Wideband Sensitivity Upgrade (WSU), and then I'll talk about ALMA followup of the highest redshift HI detection in the COSMOS HI Large Extragalactic Survey (CHILES) made with the first 178 hours of observing. With regard to the WSU, the ALMA Project is embarking on a partner-wide initiative to at least double, and... Dr. Jennifer Donovan Meyer |
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16/02/2023 - 12:00
School visit School visit Sara Garcia. |
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30/01/2023 - 12:30
SO Coloquio: Dirty Dancing: piercing the dusty environment of merging supermassive black holes It is a posit of modern astrophysics that most massive galaxies host a super- massive black hole (millions to billions of times more massive than the Sun). These black holes affect the evolution of galaxies well beyond their gravitational sphere of influence (which does not extend wider than 1/1000th of the typical galaxy linear size). In turn, the evolution of galaxies affects the growth of black holes through, e.g., galaxy merging.... Matteo Guainazzi |
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12/01/2023 - 12:30
CARMENES-PLUS: a technical upgrade for CARMENES and the impact on its science CARMENES is a dual (VIS: 550 to 950 nm; NIR: 950 to 1700 nm) high-resolution spectrograph installed at the 3.5 m telescope at the Calar Alto Observatory (CAHA, Almería, Spain). The NIR channel spectrograph uses the radial-velocity method for detecting exoplanets around low-mass stars. Thus, a high thermal stability is required in the NIR cooling system to achieve a high precision in radial velocities. The cooling system was originally conceived... Roberto Varas González |
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19/12/2022 - 12:30
Fossil groups of galaxies: seeing the future looking at the past The nature of fossil groups of galaxies has been debated for over more than 3 decades. This is in part because of the lack of deep multiwavelength data and also due to the low purity of samples selected using solely magnitude gap criteria. The initial results of a sample of bonafide fossil groups using X-ray/optical observations has clarified many of their characteristics, such as high central metal abundances and concentration measurements.... Dr. Renato Dupke |
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01/12/2022 - 12:30
SO Colloquio: Moving from high to extreme precision in air shower observations: From LOFAR to SKAO Cosmic rays play an interesting role in understanding the most violent objects in the universe. These charged atomic particles reach energies orders of magnitudes higher than achievable in accelerators on Earth, which points towards an origin of the most extreme objects in the universe, with strong magnetic shocks and mass transfer. However, these sources are not firmly identified. Astrophysical interpretations are currently limited by the... Dr. Anna Nelles |
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29/11/2022 - 12:30
TARSIS: the Tetra-Armed IFU at Calar Alto designed for the CATARSIS galaxy cluster exploration In this talk I will present the design of the Integral Field Unit TARSIS, recently selected to be the next generation multi-object spectrograph for the 3.5m telescope at Calar Alto. In addition, I will describe the scientific goals of CATARSIS, the galaxy cluster exploration that will be carried out in the first years of the operation of TARSIS. Dr. Jorge Iglesias |
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24/11/2022 - 12:30
SO webloquio: The Milky Way Nuclear Star Cluster The Milky Way nuclear star cluster (NSC) is located within the nuclear stellar disc (NSD) in the Galactic centre. The NSC and NSD are distinct structures of the Milky Way, but also connected to the larger Milky Way structures, e.g. via the inflow and outflow of gas, and the infall of star clusters. Our knowledge of the larger Milky Way structures, Galactic disc, bulge and halo, has expanded in recent years through surveys and dedicated missions... Dr. Anja Feldmeier |
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17/11/2022 - 12:30
SO colloquio: A conclusive test of the cold dark matter model The ``Lambda cold dark matter'' (LCDM) cosmological model is one of the great achievements in Physics of the past thirty years. Theoretical predictions formulated in the 1980s turned out to agree remarkably well with measurements, performed decades later, of the galaxy distribution and the temperature structure of the cosmic microwave background radiation. Yet, these successes do not inform us directly about the nature of the dark matter. This... Dr. Carlos Frenk |
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15/11/2022 - 12:30
The effect of pre-processing on the stellar population content of early-type dwarf galaxies According to the CDM model, galaxy clusters grow through the accretion of individual galaxies and galaxy groups. Thus, it is a true challenge to distinguish the possible role of the present-day host halo from that of previous ones, in the transformation of accreted galaxies. Dwarf early-type galaxies (dEs) are often regarded as statistically meaningful testbeds for investigating environmental effects mainly due to their high number density and... Dr. Bahar Bidaran |
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10/11/2022 - 12:30
SO Colloquio: The Cherenkov Telescope Array: Status and Prospects The Cherenkov Telescope Array (CTA) will become the reference observatory for Very High Energy (VHE) Gamma Ray Astronomy during the next decades. CTA promises a jump in sensitivity and energy coverage of one order of magnitude over the current instruments, significantly improved energy and angular resolutions and full sky coverage. Over thousand new sources will foreseeably be identified in this range for the first time. VHE gamma rays are... Dr. Juan Cortina |
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08/11/2022 - 12:30
The many “phases” of small bodies Asteroids, comets, and trans-Neptunian objects are collectively known as small bodies. In a way, they are the debris left by the planetary formation in the Solar system, and as such, they carry a lot of information regarding the processes that shaped it. But, small bodies are by no means stationary objects: not only do they move across the sky, but their brightness also changes due to different mechanisms, from rotational variations due to... Dr. Álvaro Alvarez-Candal |
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07/11/2022 - 12:30
The ASTRI Mini-Array and its Science The ASTRI Collaboration is building at the Teide Astronomical Observatory in Tenerife an array of 9 small Cherenkov telescopes capable of observing with good flux sensitivity, energy and angular resolution the gamma-ray sky above an energy threshold of several hundreds of GeV. The ASTRI telescopes adopt a dual-mirror Schwarzschild-Couder optical design. Entrapped amidst the two mirrors the ASTRI camera, based on silicon photon-multipliers... Dr. Giacomo Bonnoli |
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28/10/2022 - 12:30
SO Colloquio: Cosmografía: las aportaciones de al-Ándalus y los reinos ibéricos a la Revolución Científica Si el Señor Todopoderoso me hubiese consultado, antes de embarcarse en la Creación, le habría recomendado algo más simple. Esta frase, supuestamente formulada por Alfonso X "el Sabio", muestra la complejidad del conocimiento cosmográfico en al-Ándalus y en los reinos cristianos que recibieron su acervo científico. La península Ibérica se convirtió a partir del siglo X en puente esencial para que el saber de la civilización grecorromana,... Dr David Barrado Navascués |