Astrophysics News & Events

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Radio jet studies in Superluminous Supernovae and Cataclysmic Variables

Speaker
Deanne Coppejans
Event date
Venue
Room 32.3.30 CICFANO
Event type

Recent advances in radio telescopes in sensitivity, response time, and wavelength coverage have opened a wealth of new research opportunities. This is particularly the case for transients, where high sensitivity and rapid response is crucial. I will describe how radio observations of two classes of objects are helping to further our understanding of jet physics.

Exploring the atmosphere of Venus using a general circulation model

Speaker
Gabriela Gilli -- Institute of Astrophysics and Space Sciences
Event date
Venue
room 32.3.30 CICFANO
Event type

The satellite Venus Express (2006-2015), together with the Japanese spacecraft Akatsuki (still in orbit) and ground-based campaigns, are unveiling our neighbor planet. At the same time, those new measurements put in evidence the complexity and the high variability of the Venus atmosphere, opening new scientific questions (e.g.

Morphology and absolute magnitudes of QSOs, from astrometry to astrophysics

Bruno Coelho
Speaker
Bruno Coelho
Event date
Venue
room 32.3.30 CICFANO
Event type

Quasi-Stellar Objects (QSOs) are active galactic nuclei so powerful, that their luminosity can surpass that of the host galaxy, making the observation of the latter extremely difficult or even impossible. Usually QSOs appear on images as point-like sources, what, together with the enormous distances, makes them excellent objects for the materialization of reference systems.

Successful SKA-day national event!

"SKA days PT" took place last 6 and 7 of February, at Covilhã and Lisbon, an initiative to promote the Square Kilometer Array (SKA) - the world's largest radio telescope - among the Portuguese scientific and business communities.

SKA project has the participation of 19 countries, in the case of Portugal it is via the infrastructure ENGAGE SKA, which is a consortium composed by the Instituto de Telecomunicações, the Universities of Aveiro (Gr@v), Porto and Évora, and the Polytechnic Institute of Beja.

Greybody factors and quasinormal modes under scalar perturbations in two concrete exactly solvable models

Seminars 2018
Speaker
Grigorios Panotopoulos (CENTRA, IST-Lisbon)
Event date
Venue
Anf. Física
Ends on
Event type

Greybody factors are frequency dependent quantities that measure the deviation from the perfect black body spectrum of Hawking radiation, and they provide us with valuable information about the near horizon structure of black holes. In
addition, when black holes are perturbed the geometry of spacetime undergoes dumbed oscillations.