Recent Talks

List of all the talks in the archive, sorted by date.


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Thursday March 17, 2022
Dr. Alis Deason
ICC Durham

Abstract

 

The hierarchical nature of structure formation predicts that haloes grow by the aggregation of several lower-mass "clumps". A natural consequence of this process is the existence of an extended halo of stars surrounding galaxies, which is built up from the debris of destroyed lower mass objects. The nature of these haloes has been studied extensively from Milky Way to cluster-mass systems. However, the stellar haloes of dwarf galaxies have been given relatively little attention.  In this talk, I will discuss recent work using N-body cosmological simulations and empirical galaxy models to study the  build-up of stellar haloes surrounding dwarf galaxies. We find that the galaxy formation model parameters, namely the stellar mass-halo mass relation and the galaxy occupation fraction, strongly influence the stellar mass accreted onto dwarf galaxies. Moreover, the type of dark matter can also be important, as minor mergers are greatly suppressed in warm dark matter models. Finally, I will discuss the observational implications of these results, and the future prospects for constraining small-scale models with observational probes.

 

 

Youtube:

https://youtu.be/61vvPaHQft4

 


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Friday March 11, 2022
Manuel Luis Aznar
Instituto de Astrofísica de Canarias

Abstract

En este seminario se dará una pequeña introducción al desarrollo de interfaces gráficas para GTC


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Thursday March 10, 2022
Dr. Nushkia Chamba
The Oskar Klein Centre, Stockholm University

Abstract

In this seminar, we will explore how the development of imaging techniques, from the use of photographic plates in the 1930s to current CCD imaging, impacted the definition and measurement of galaxy size. We then propose an alternative, new physically motivated size definition based on the gas density threshold required for star formation that challenges our current understanding of the concept of galaxy size. The new physically motivated size measure can be adopted in upcoming deep, wide imaging surveys such as the LSST and ongoing efforts in preparation for this era will also be discussed.

 

Zoom:

https://rediris.zoom.us/j/87538068288?pwd=TGRWL1NYM1JlSXVpV1g2enphV3lCZz09

Meeting ID: 875 3806 8288

Passcode: 393134

 

 

Youtube:

https://youtu.be/Jv4lTY1wtU4

 

Youtube:


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Tuesday March 8, 2022
Prof. Antonio Córdoba
ICM

Abstract

Mathematics of atmospheric fronts: S.Q.G.(Surface Quasigeostrophic Equation) is a relevant model to understand the evolution of atmospheric fronts. It represents also a mathematical challenge, because of its non-linear and non-local character, which illustrates the rôle of mathematics in the development of science.

This colloquium will be held in person in the Aula


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Friday March 4, 2022
Georg Schitter
ACIN, TU Wien, Austria

Abstract

Mechatronic imaging systems, used in scientific applications as well as in the high-tech industry, demand a continuous improvement of precision, range, as well as system bandwidth and speed. These challenging goals can be achieved only by a proper system integration, which requires an advanced mechatronic system design and highly sophisticated motion control. Example applications for the discussed mechatronic imaging systems are atomic force microscopes (AFM), wafer scanners, scanning laser and LIDAR systems, as well as adaptive optics and satellite ranging.

A proper system integration that utilizes the interplay between mechatronic system design and control design is key for achieving maximum performance of mechatronic systems in high-tech applications. Already at the system design phase all components involved in the specific application have to be considered. Examples for these components are the mechanical structure of the device, the power amplifier, the actuators, the sensors, electronics, and the real-time control system. To meet the demanding specifications, the final system, including all hard- and software components, has to be tailored to and optimized for each specific application.

https://youtu.be/cHljnHRpJAQ


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Friday February 25, 2022
Esther Soria Hernández
IAC/ULL

Abstract

La construcción de grandes telescopios requiere el desarrollo de sistemas de Óptica Adaptativa (AO) cada vez más sensibles y rápidos. Sin embargo, todo el esfuerzo invertido en estos desarrollos deja atrás la gran cantidad de telescopios de menor tamaño que aún son cruciales en las campañas de observación y a los que se les podría sacar un mayor rendimiento.

A lo largo de esta presentación hablaremos del prototipado de un sistema real de AO en visible, diseñado para el Telescopio Carlos Sánchez (TCS, 1.5m) y compatible con el Telescopio Óptico Nórdico (NOT, 2.5m), que puede mejorar las capacidades de fotometría y espectroscopía de estos telescopios, lo que nos permitirá trabajar en visible e IR.

El instrumento a desarrollar tiene por nombre ALIOLI (Adaptive and Lucky Imaging Optics in a Lightweight Instrument) y es una evolución del instrumento AOLI (Adaptive Optics y Lucky Imager) buscando un instrumento ligero y portátil que pueda ser instalado en diferentes telescopios.

Para este enfoque se concentraron los esfuerzos en seleccionar el sensor de frente de onda (WFS) más adecuado para el instrumento, realizando estudios comparativos de la sensibilidad, la linealidad y el rango dinámico de cada uno de los sensores propuestos. Además, se propone un estudio de la respuesta de cada sensor en función del telescopio, las condiciones atmosféricas y del instrumento de ciencia que se vaya a colocar a posterior. El estudio comparativo incluye resultados de simulación, test en laboratorio utilizando un simulador de telescopio y atmósfera, así como pruebas en telescopio.

 

Enlace YouTube

https://youtu.be/hcpDCb4u3Y0

 


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Thursday February 24, 2022
Dr. Diego Godoy-Rivera
IAC

Abstract

Rotation plays an important role in the life of stars and offers a potential diagnostic to infer their ages and that of their planets. This idea is known as gyrochronology, and if properly calibrated, its applications to Galactic, stellar, and exoplanetary astrophysics would be far-reaching. Nevertheless, while potentially fruitful over a wide range of ages and masses, recent results have raised concerns regarding gyrochronology’s applicability. In this talk, I will present the opportunities that the Gaia astrometry has opened to address these issues. First, regarding rotation’s classical calibrators, I will illustrate the impact that removing the non-member contamination has on the rotational sequences of open clusters. Second, I will present a novel method that tests the state-of-the-art gyrochronology relations in under-explore domains using wide binary stars. Finally, I will discuss the prospects for expanding the existing rotational constraints in unprecedented regimes using data from the TESS mission.


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Friday February 18, 2022
Mary Barreto Cabrera
IAC

Abstract

 

El Proyecto del telescopio solar europeo EST, de cuatro metros, está en su fase de diseño preliminar, previa a la fase de construcción. En esta charla presentaré la Oficina de Proyecto de EST y el estado de los trabajos de diseño del telescopio que se realizan y/o gestionan desde la Oficina de proyecto, con el objetivo claro de hacer realidad EST en el Observatorio del Roque de los Muchachos en la Palma.

 

Unirse a la reunión Zoom

https://rediris.zoom.us/j/83477510350

 

https://youtu.be/s_uaVhtzY8M


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Thursday February 17, 2022
Dr. Else Starkenburg
Kayptern institute

Abstract

The lowest metallicity stars that still exist today represent a window into the early Universe. Studying these stars gives us a local avenue to guide our understanding of star formation and supernova feedback in the early Universe, the early build-up of galaxies like our Milky Way, and the epoch of reionization. In this talk I will present recent results of the Pristine survey, a narrow-band photometric survey of the Milky Way designed to get metallicity information for millions of stars very efficiently. I will discuss what we have learned from our analysis of the most metal-poor stars about the early formation of the Milky Way. Moreover, I will highlight the bright future for this type of study in synergy with the upcoming highly-multiplexed spectroscopic surveys.


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Friday February 11, 2022
Dr. Álex Oscoz Abad
IAC

Abstract

El IAC puso en marcha hace cinco años una iniciativa pionera para impulsar y promover la transferencia de tecnología a la industria espacial, IACTEC-Espacio, dedicada al diseño e integración de cargas útiles para pequeños satélites y al desarrollo de algoritmos para extraer información de imágenes de observación de la Tierra.

En enero de 2021 se lanzó con éxito nuestro primer instrumento, DRAGO, una cámara para observar la Tierra en dos bandas en infrarrojo de onda corta (SWIR). Además un diseño compacto, DRAGO incorpora una tecnología innovadora: un sensor InGaAs sin refrigeración. Tras un año de funcionamiento, DRAGO ha demostrado su utilidad en muchas de las aplicaciones para las que fue diseñado, como el control de la humedad o la detección y seguimiento de focos e incendios.

El próximo hito será ALISIO I, el primer satélite canario con una versión de mayor resolución de DRAGO, que se lanzará en el primer trimestre de 2023. El equipo también está trabajando en dos proyectos con un nivel de complejidad aún mayor: IACSAT-1-TAJINASTE, el primer observatorio espacial astronómico del IAC, y VINIS, una cámara de observación de la Tierra con resolución inferior a 10 m y capacidad de observación simultánea en los rangos visible y SWIR.





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Recent Talks