Présidents de session
Science talks: Observing strategy, PFS and symbolic regression
- Pierre Antilogus (LPNHE)
Science talks: Clusters and photo-z
- Benjamin Racine (CPPM/IN2P3/CNRS)
Science talks
- Il n'a pas de président de session pour ce bloc
Science talks: Photometric redshifts and supernovae
- Il n'a pas de président de session pour ce bloc
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Dr Philippe Gris (LPC)28/11/2022 16:30
This presentation will include recent developments of LSST observing strategy presented during the last SCOC workshop in november. The current contours of the LSST observing strategy and the action plan for the next coming months will be shown.
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stephane arnouts (LAM)28/11/2022 17:00
PFS is a unique wide field multiplex spectrograph with a 1.3 deg$^2$ f.o.v. and covering the wavelength domain: 0.38-1.26$\mu$m. PFS will start operating mid 2024. It will perform a 360 nights survey with three components: a cosmology survey to investigate the dark sector; an archeology survey for the origin of the milky way and nearby dwarf galaxies; a galaxy evolution survey to reveal the...
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Etienne Russeil28/11/2022 17:30
Symbolic Regression is a data-driven method that searches the space of mathematical equations with the goal of finding the best analytical representation of a given dataset. It is a very powerful tool, which enables the emergence of underlying behavior governing the data generation process. Furthermore, in the case of physical equations, obtaining an analytical form adds a layer of...
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Constantin Payerne (LPSC (IN2P3))29/11/2022 09:00
Weak lensing is a powerful tool to estimate the matter distribution around massive galaxy clusters. In general, such effect can be measured by estimating the averaged tangential shear of background galaxies in circular annuli from the lens center. In addition to the average tangential shear, valuable informations on the underlying dark matter distribution can be extracted by using shear...
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Manon Ramel (LPSC / IN2P3)29/11/2022 09:20
Galaxy clusters trace the highest peaks in the density of the Universe. Therefore, their abundance is a powerful probe to constrain cosmological parameters, expansion of the Universe and give information on the growth of structures. However, since the density of galaxies is significantly higher, these latter may appear to overlap on the line of sight and have their respective fluxes blended....
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Kirill Grishin (Universite de Paris)29/11/2022 09:40
The distribution of galaxy clusters, the largest gravitationally bound structures in the Universe, helps us to estimate fundamental constants and constrain different cosmological models. With the expected development and commissioning of astronomical instruments, such as LSST, in the next decade, the depth of imaging data for a significant area of the sky will allow us to select nearly...
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Vincent Reverdy (Laboratoire d'Annecy de Physique des Particules)29/11/2022 10:00
Galaxy clusters and dark matter halos constitute a building block of many cosmological analyses. However, amongst simulations and observations, there is a wide variety of definitions of what a cluster is from a physical standpoint that do not necessarily match with each other. On top of that, on the algorithmic side, detection strategies can vary greatly from traditional friend-of-friend...
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Reda AIT OUAHMED29/11/2022 10:20
Convolutional Neural Networks have recently shown high performances in measuring photometric redshifts in the local SDSS surveys. Extending this technique at higher redshift remains a challenge due to the lack of representativity of the training set for faint sources. In this talk we apply this technique on the state-of-the-art HSC deep imaging survey (with UgrizY photometry down to i~26.5),...
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Florent Leclercq (Institut d'Astrophysique de Paris)29/11/2022 17:00
While the next generation of surveys soon starting will generate orders of magnitude more data than previously, it is becoming increasingly clear that traditional techniques are not up to the challenge of fully exploiting the raw data. The last few years have seen vast progress in the field of probabilistic large-scale structure inference, which differs in intent from traditional measurements...
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Mathew Smith (IP2I/IN2P3/CNRS)30/11/2022 09:00
LSST, with 100,000 SNeIa, is the future of supernova cosmology. However, LSST alone cannot constrain the equation-of-state of Dark Energy: a nearby sample is needed to anchor the Hubble diagram. With measured distances to 6000 SNeIa, and unbiased to z<0.05, the Zwicky Transient Facility (ZTF) ZTF will be the primary anchor for all cosmological analyses with LSST.
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With over 3000 SNeIa already... -
Madeleine Ginolin (IP2I)30/11/2022 09:20
I will present SNe Ia standardization and its environmental dependence in the case of the ZTF DR2 sample.
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