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Journal Club
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Learning slot
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Weak-Lensing/ShapePi…
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10
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CFHT Users Meeting
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DAp seminar
DAp seminar
May 10, 2022 10:00 AM - 11:00 AM
Salle Galilée
Comptonization Problem and Its solution in Application
to the Spectra of the Neutron Star and Black Hole Sources
Lev TITARCHUK
In 2017, the work on the Comptonization (Sunyaev-Titarchuk) seen in the X-ray spectra of astrophysical sources was a candidate for the Nobel Prize in Physics. In this talk I provide all the details of the exciting prehistory of this topic and precise details of this discovery. The solution of this problem and its subsequent development and application to the spectra of accreting neutron star (NS) and black hole (BH) binaries reveals a lot of information on these objects. In particular, now we can unambiguously distinguish between a NS and a BH (Galactic or extragalactic) using correlations of their spectral indices vs mass accretion rate (or QPO frequency). I further demonstrate how we can determine a BH mass using this correlation.
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Staff meeting
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12
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13
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CosmoStat seminar: S…
CosmoStat seminar: Sven Heydenreich
May 13, 2022 10:00 AM - 11:00 AM
Kepler room
Persistent Homology in Cosmic Shear: Constraining cosmological parameters with topological data analysis
Abstract: Persistent Homology is a tool from Topological Data Analysis that was created to infer topological properties of a dataset in the presence of noise and masks. In this talk I will highlight the basic working principle and discuss the advantages and disadvantages of this method with respect to other higher-order statistics. I will quantify the constraining power of this statistical tool with an analysis of first-year data from the Dark Energy Survey.
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Learning slot on rad…
Learning slot on radio astronomy
May 13, 2022 14:00 PM - 15:00 PM
Special guest Julien Girard
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Weak-Lensing/ShapePi…
Weak-Lensing/ShapePipe meeting
May 13, 2022 15:00 PM - 16:00 PM
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DAp seminar
DAp seminar
May 17, 2022 10:00 AM - 11:00 AM
Salle Galilée
A decade of the main sequence of star-forming galaxies: new insights and perspectives on massive galaxy formation
Benjamin MAGNELLI (LCEG)
The observed tight correlation between the star formation rate (SFR) and the stellar mass of star-forming galaxies (SFGs) is now well constrained over the last 10 Gyr of look-back time. This so-called main sequence (MS), whose normalization declines from z~3 to 0, is commonly interpreted as evidence that SFGs are evolving primarily through a steady and long star-forming mode, likely sustained by the cold gas accretion along the cosmic web. Over the last decade, a plethora of studies have investigated within this framework the physical properties of SFGs along and across the MS, establishing key scaling relations between, e.g., the stellar mass, gas content, and/or morphology of SFGs in the SFR-stellar mass plane. In this talk I will review past and recent observational evidences of this new MS paradigm and how it has shaped our understanding of the evolution of massive galaxies. Then, I will present the limitations of this simple paradigm, and in particular how it fails to explain the more diverse than anticipated population of MS galaxies (e.g., starburst hidden within the MS), the importance of secondary parameters (e.g., environment) and the transition of SFGs to quiescence. I will conclude by presenting future observational opportunities that can be used to investigate this hidden complexity within the main sequence and to further unveil the physics involved in the evolution of massive galaxies over cosmic time.
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Remote group meeting
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Journal Club
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Weak-Lensing/ShapePi…
Weak-Lensing/ShapePipe meeting
May 20, 2022 15:00 PM - 16:00 PM
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25
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CosmoStat seminar: M…
CosmoStat seminar: Martin Eriksen
May 25, 2022 10:00 AM - 11:00 AM
Kepler room
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Conseil Scientifique…
Conseil Scientifique et tecnique (CST) DAp meeting (morning is open to everyone; afternoon for the committee only)
May 31, 2022
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