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Strong lensing: Illuminating galaxies clusters and the structures behind them Abstract The strong gravitational lensing effect is a powerful technic to study both the deflector of light and the magnified sources behind it. In this talk, I will first review mass modelling approaches of galaxy...
Quasar feedback and the origin of extended Lyα glow in z > 6 quasars AbstractThe detection of quasars out to z ≈ 7.5 shows that supermassive black holes with masses of ≈109M☉ have already assembled by the time the Universe was only ≈ 680 Myr old. These observationsstrenuously...
Observational Evidence of Evolving Dark Matter Halos with cosmic time Abstract In the late 1970s, Vera Rubin showed that flat rotation curves are ubiquitous in local Star-forming Galaxies (SFGs) and concluded that “galaxies are surrounded by an invisible matter, the so-called dark matter...
Is there a tension on the amplitude of matter fluctuations in the LCDM model? Abstract The results of the eBOSS survey provide the best current measurements of the properties of the distribution of galaxies, constituting the summary of a long-term SDSS effort. Among those, the amplitude of...
eROSITA's First View on Hot Baryons of the Universe Abstract Successfully launched in July 2019, eROSITA, the German-built telescope array operating between 0.2-8 keV on board the Russian-German Spectrum-RG (SRG) mission, provides a unique imaging, spectroscopic, and timing capability. By...
The challenge of modeling turbulent, multiphase gas Abstract Astrophysical systems, such as the interstellar, intracluster medium, or the circumgalactic medium, are usually multiphase with a colder phase embedded in a volume filling hot environment. Although ubiquitous, multiphase gas is...
Multimessenger astronomy with neutrinos : what have we learned so far ? Abstract The recent detection of high-energy astrophysical neutrinos and gravitational waves open a new era in multimessenger astronomy. Exploring high-energy sources with these new messengers and electromagnetic...
What can auto-differentiation do for you? Applications of machine-learning tools to stars, dynamics and dust Abstract Machine learning has found increasing use in astronomy over the last few years. In this talk, instead of discussing machine learning itself, I will discuss how a mathematical...
Galaxy evolution in the metric of the cosmic web Abstract The matter distribution in the Universe follows a spectacular web-like structure consisting of voids, walls, filaments and nodes, naturally defining the environment in which galaxies form and evolve across cosmic time. That certain...
X-ray polarimetry with IXPE Abstract Polarimetry in the X-ray band would help us answer many open questions on the nature of emission processes and geometry in many celestial sources. However, the field of X-ray polarimetry has been dormant for decades, with only one object, the Crab Nebula,...