Sami Dib – Laboratoire d’Astrophysique de Bordeaux, France
The emergence of the three-dimensional structure of the cosmic web over the history of the Universe displays very distinctive features when observed in X-rays, where both the most massive collapsed structure (clusters of galaxies) and the most energetic events in the life of galaxies (AGN and Quasars) reveal themselves unambiguously.
The next generation of wide-area, sensitive X-ray surveys designed to map the hot and energetic Universe will be heralded by eROSITA (extended ROentgen Survey with an Imaging Telescope Array), the core instrument on the Russian-German Spektrum-Roentgen-Gamma (SRG) mission, successfully launched in July 2019. On December 13, after completion of its Calibration and Performance Verification phase, SRG/eROSITA has begun its four-years program dedicated to surveying the entire sky eight times in the energy range ~0.2-8 keV.
The high sensitivity, large field of view, high spatial resolution and high survey efficiency of eROSITA is bound to revolutionize X-ray astronomy: within just the first year of operation it will discover more new celestial X-ray objects as have been catalogued from 1962 until today.
I will present an overview of the instrument capabilities, the current status of the mission, the early science results and the expectations for the X-ray all-sky survey program and its planned followup programs.
Mercoledì 8 Aprile 2020 ore 11
Ileana Chinnici, INAF-OA-Palermo
Back to early astrophysics: the contribution of Angelo Secchi (1818-1878)
Mainly known as trailblazer of the spectral classification of stars and pioneer of solar physics, Angelo Secchi is one of the most brilliant and modern figures in the Italian and international scientific context of the second half of the 19th century. His background was in physics, but he was called in 1849 to became director of the Collegio Romano Observatory, where he applied early techniques of photography and spectroscopy in the field of astronomy. Driven by his wide scientific curiosity, Secchi explored many scientific domains, trying to find correlations between the natural phenomena and giving important contributions in all his fields of interest. This talk will outline his interesting profile of Jesuit scientist and illustrate his main scientific results, that had paved the way to current research topics and methods (not only in astronomy).
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