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2020-01-24 Primero resultados del Telescopio de horizonte de eventos: la primera imagen del agujero negro supermasivo en el centro de Messier 87
Area: Astrofísica
Investigador Invitado Loinard Laurent
Filiación Institucional IRYA-Morelia
Resumen: Ver resumen El Telescopio de horizonte de eventos (EHT, por sus siglas en ingles) es un instrumento que combina una decena de telescopios repartidos en toda la Tierra y permite reconstruir imágenes en la banda milimétrica del espectro electromagnético con una resolución angular (del orden de 25 micro-segundos de arco) muy superior a la de cualquier otro instrumento astronómico. El 10 de abril de este año, se anunciaron los primeros resultados de este instrumento: una imagen del entorno del agujero negro supermasivo en el centro de la galaxia Messier 87 que muestra una depresión central interpretada como la sombra producida por al agujero negro mismo. En esta charla, describire el instrumento EHT, la técnica que utiliza, y el tratamiento de datos que permite reconstruir imágenes con este instrumento. Después, describiré la imagen de M87 obtenida, así como su interpretación en términos de modelos de magneto-hidrodinámica en el contexto de la relatividad general (GR-MHD). Terminare con unas perspectivas a futuro.
   
Lugar-Hora Auditorio del Centro de Información - 12:00
   
2020-01-28 FUNDAMENTAL CONSTANTS - THE NEW SI AND GENERAL RELATIVITY
Area: Física
Investigador Invitado Jean-Philippe Uzan
Filiación Institucional CNRS, Francia
Resumen: Ver resumen In the new international system of units to be adopted at the end of
this year, fundamental constants play a central role in the
definitions of the units. This introductory lecture will come back
on this choice as the endpoint on a long historical quest to base
units on the most universal objects we know. It will be discussed the
nature of fundamental constants in the laws of physics in order to
highlight the interplay with theory. To finish, it will be discussed the
hypothesis that these parameters are constant both from a
theoretical and experimental perspective and the link with the
equivalence principle at the heart of general relativity.
   
Lugar-Hora Auditorio del Centro de Información - 12:00
   
2020-02-11 CubeSounder: A Millimeter-Wave Weather Satellite in a Cubesat
Area: Instrumentación
Investigador Invitado Sean Bryan
Filiación Institucional Arizona State University
Resumen: Ver resumen Millimeter waves offer a unique and powerful window onto the universe in sensing applications ranging from airport security and weather satellites to direct imaging of the Big Bang. Passive millimeter-wave sensing systems yield unique and complimentary data to active RF radars or humidity-limited FLIR/optical sensors, and Arizona State University is a world leader in developing and deploying these systems. systems. In this talk, I will describe a low-SWaP-C millimeter-wave weather satellite sensor we developed for cubesat applications. Legacy high-SWaP-C satellites of this type already yield powerful data that is the single leading driver of weather forecast accuracy. Our sensor would bring this capability to the cubesat platform, offering a disruptive opportunity for wider sensor deployment to drive major improvements in weather forecast accuracy as well as improving the forecast lead time.
   
Lugar-Hora Auditorio del Centro de Información - 12:00
   
2020-02-21 On the prevalence of dust-obscured star formation in the early Universe
Area: Astrofísica
Investigador Invitado Jorge Zavala
Filiación Institucional tbd
Resumen: Ver resumen The majority of the star formation activity in the Universe during the past 10-11 Gyr, back to z ~2.5, is primarily enshrouded by dust. However, although
the history of cosmic star-formation has been thoroughly mapped at observed optical and near-infrared wavelengths out to z ~11, submillimeter and millimeter surveys of the early Universe, probing dust-obscured star-formation, have not kept apace. Therefore, our census of the cosmic star formation rate density (SFRD) at the earliest epochs (z>4) is incomplete, In this talk, we will present our 2mm and 3mm ALMA surveys and individual follow-ups of dust-obscured star-forming galaxies at z=4-6, from which the dust-obscured SFRD up to z~6 has been estimated.
   
Lugar-Hora tbd - 12:00
   
2020-03-27 Observing magnetic activity with giant stars: between magnetic braking and revival
Area: Astrofísica
Investigador Invitado Klaus-Peter Schröder
Filiación Institucional Universidad de Guanajuato
Resumen: Ver resumen By contrast to coronal X-ray detections, chromospheric emission measures are a less biased indicator for magnetic activity among cool giant stars. We review the legacy of Mount Wilson "S-index" observations, and together with our own chromospheric activity monitoring data of bright, cool giants (obtained by the robotic telescope project TIGRE in Guanajuato, MEX) we put magnetic activity among giant stars into context with stellar evolution. We show that (1) despite huge -compared to the Sun- convective envelopes, activity is a common phenomenon among cool giant stars. (2) After magnetic braking on the main sequence and a first revival in the Hertzsprung gap, giant activity suffers from magnetic braking again during central Helium burning, (3) until higher up on the AGB, chromospheric emission is, surprisingly, again on the rise. Coincidently, each activity revival coincides with a phase of fast core contraction. Is this a hint on the origin of the dynamo in giants, by a spinning up of the contracting core??
   
Lugar-Hora Auditorio del Centro de Información - 12:00


Última modificación :
05-07-2010 a las 14:08 por Webmaster

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