In questa pagina pubblichiamo le registrazioni dei seminari scientifici realizzati dai ricercatori INAF-IAPS a scopo di formazione scientifica interna sugli ultimi risultati della ricerca.
Il copyright dei video e dei materiali contenuti appartiene ai relatori. Per qualsiasi richiesta di utilizzo, si prega di contattare i ricercatori.
27 Maggio 2020
Sami Dib – Laboratoire d’Astrophysique de Bordeaux, France
The 1001 modes of Star Formation
Abstract: Star formation is a multi-physics, multi-scale process. the physical scales that are involved vary by 10 orders of magnitude, from the size of entire galaxies down to the size of the Solar system. The physical processes that are involved include gravity, turbulence, magnetic fields, radiation, chemical reactions, and cooling and heating processes. This multiplicity of processes and scales can generate a significant amount of scatter in the outcome of star formation from galaxy to galaxy and from region to region within galaxies, in particular in terms of key quantities such as the stellar initial mass function (IMF), the star formation rate (SFR), and the star formation efficiency (SFE).I will present an overview of the current status of observations for the IMF and the SFR in the Milky Way and in nearby galaxies and discuss theoretical models and numerical simulations that attempt to reproduce these observations. I will also briefly discuss how the morphology of star forming regions can help us understand how these regions have assembled and how the morphology correlates with the SFR.
13 Maggio 2020
Andrea Merloni – MPE (Garching, Germany)
Mapping the hot Universe: the first six months of operations of eROSITA on SRG
Abstract: 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.
08 Aprile 2020
Ileana Chinnici – INAF OA Palermo
Alle origini dell’astrofisica: il contributo di Angelo Secchi (1818-1878)
Abstract: 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).
25 Marzo 2020
Alessandro Chieffi (INAF/IAPS)
The predicted Masses of stellar black holes as a function of the initial mass, metallicity and initial rotation velocity
Abstract: Massive stars play a major role in driving the physical and chemical evolution of the galaxies because either they are the main responsible for the synthesis of new nuclei (including the long living radioactive ones, as Al26 and Fe60) and they inject enormous amounts of energy in their surroundings, favoring / inhibiting the formation of new stars. They are also the parents of the neutron stars and stellar black holes that populate the universe, and hence they are also strictly connected with spectacular phenomena like the Supernova explosions, GRBs and gravitational waves emission. In this seminar, I will concentrate on the initial mass remnant mass relation, and on its dependence on the metallicity and initial rotational velocity, trying to highlight the major sources of uncertainty that affect the robustness of this connection.
Quest’opera è distribuita con Licenza Creative Commons Attribuzione – Non commerciale – Non opere derivate 4.0 Internazionale.