Events at the API
Seminar Patrick Crumley: Super-Eddington Tidal Disruption Events: An Ideal Place to Probe Relativistic Jet Compositions and Emission Mechanisms.
Tuesday 27 January 2015
When a star wanders too close to the supermassive black hole at its galactic center, the tidal forces of the black hole overcome the self-gravity of the star. The star is torn apart in a tidal disruption event. A large fraction of the material from the star will fallback onto the black hole.
Seminar Ke Fang: Ultrahigh Energy Cosmic Rays and Newborn Pulsars
Friday 23 January 2015
The workings of the most energetic astrophysical accelerators in the Universe are encoded in the origin of ultrahigh energy cosmic rays (UHECRs). Current observations by the Auger Observatory, the largest UHECR observatory, show a spectrum that agrees with an extragalactic origin, as well as an interesting transition in chemical composition from light element to heavier element as energy increases.
Seminar Sean Griffin: VERITAS and the Bright Moonlight Program
Friday 23 January 2015
The VERITAS experiment measures Cherenkov light from air showers to study gamma rays. In this seminar I will provide an overview of the upgrade of the VERITAS array, details of the bright moonlight observing modes, and novel calibration techniques I have helped develop.
PhD Defense Danai Antonopoulou
Wednesday 21 January 2015
On Wednesday January 21 at 14:00 Danai Antonopoulou will defend her thesis titled "Rotational glitches in radio pulsars and magnetars" in the Agnietenkapel.
Seminar: The fluorescence detection of cosmic rays with silicon photomultiplier-based telescope
Tuesday 13 January 2015
Maurice Stephan - RWTH Aachen: In this talk I will present the telescope FAMOUS and the first absolute light flux measurements of stars and the night-sky with an SiPM-instrumented telescope. Such measurements are essential to evaluate the performance of telescopes regarding their sensitivity to signals from air showers.
Phd Defense Theo Chousinho Khouri Silva
Tuesday 16 December 2014
On Tuesday December 16 at 12:00 Theo Chousinho Khouri Silva will defend his thesis titled "Oxygen-rich AGB stars with low mass-loss rate observed with Herschel" in the Agnietenkapel.
PhD Defense Olga Hartoog
Wednesday 10 December 2014
On Wednesday December 10 at 14:00, Olga Hartoog will defend her thesis titled "Spectroscopy of the environments of long gamma-ray bursts and their progenitors" in the Agnietenkapel.
PhD Defense Frank Tramper
Friday 28 November 2014
On Friday November 28 at 12:00 Frank Tramper will defend his thesis titled "The properties of low-metallicity massive stars" in the Agnietenkapel.
An accurate and efficient algorithm for detection of radio bursts with an unknown dispersion measure, for single dish telescopes and interferometers
Tuesday 18 November 2014
Astronomical radio bursts disperse while traveling through the interstellar medium. To optimally detect a short-duration signal within a frequency band, we have to precisely compensate for the pulse dispersion, which is a computationally demanding task. We present the Fast Dispersion Measure Transform algorithm for optimal detection of such signals.
PhD Defense Daniela Huppenkothen
Tuesday 14 October 2014
On Tuesday October 14 at 14:00, Daniela Huppenkothen will defend her thesis titled "A New Statistical Toolbox for Studying Variability in Fast Transients" in the Agnietenkapel.