Alessandra Derosa, Anna Milillo, Sergio Molinari.
Web seminar IAPS
Wednesday 27 May 2020 11AM
Sami Dib – Laboratoire d’Astrophysique de Bordeaux, France
The 1001 modes of Star Formation
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.
Wednesday 13 May 2020 11AM
Andrea Merloni – Max-Planck Institute fuer Extraterrestrische Physik
Mapping the hot Universe: the first six months of operations of eROSITA on SRG
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.