Rubin LSST-France, APC Paris, 27-29/11/2024

Session

Science talks

28 nov. 2024, 09:30

Amphithéâtre Pierre Gilles de Gennes (sous-sol) (APC)

Présidents de session

Science talks: Galaxies and SN

• Céline Combet (LPSC)

Science talks: FINK and more

• Julien Peloton (CNRS-IJCLab)

Science talks: Clusters

• Marina Ricci

3. Growth rate measurement using LSST type Ia supernovae

Damiano Rosselli (CPPM)

28/11/2024 09:30

Type Ia supernovae (SNe Ia) are well-known distance indicators. Through the distance recovered from SNe, it is possible to recover their host galaxy's peculiar velocities (PVs). The PV field measured by SNe Ia enables us to constrain the growth rate of cosmic structure. Using a realistic simulation of SNe light curves, as expected from LSST, we have analyzed the sample bias due to selections...

1. High-redshift LBG selection from broadband and wide photometric surveys using a Random Forest algorithm

Constantin Payerne (CEA/DPhP/Irfu)

28/11/2024 09:50

Lyman-Break Galaxies (LBGs) are promising tracers for exploring the properties of dark energy in the high-redshift Universe. In light of DESI-II, the extension of the current Dark Energy Spectroscopic Instrument (DESI) that will start in 2029, the role of broadband-wide photometric surveys such as UNIONS or the Vera C. Rubin LSST is essential to design the optimal selection of these $z \geq 2$...

12. The Effect of the Environment on Galaxy Scaling Relations as a Function of Redshift in Euclid and LSST

Cressida Cleland

28/11/2024 10:10

We present predictions on the effect of the local environment on the quenched fraction and early-type fraction of galaxies, as a function of redshift. With a focus on z=2-3, we probe how the `protocluster' environment affects galaxy evolution. We compare between various semi-empirical and semi-analytic models. We combine simulated Euclid and LSST data to select for quenched galaxies from z=0.5...

10. The Rubin Galaxies science collaboration

Simona Mei

28/11/2024 10:30

We will present the Rubin Galaxies science collaboration, and recent updates to our publication policy.

11. Fink

Dr Julien Peloton (CNRS-IJCLab)

28/11/2024 14:00

Status & perspectives of the Fink project 6 months before the start!

4. Human-Labelling-Free Transient and Bogus Classifier using Gen3 LSST Pipelines

Raphael BONNET GUERRINI

28/11/2024 14:20

In the upcoming LSST survey, transient detection—including events like Type Ia supernovae (SNe Ia)—will be conducted through Difference Image Analysis (DIA). A major challenge in this method is that many detections are actually "bogus", arising from noise, artifacts, imperfect image subtraction, cosmic rays, bad pixels, or atmospheric effects. Currently, distinguishing real transients from...

5. Transient Classifiers for Fink: Benchmarks for LSST

Dr Emille Ishida (CNRS/LPC-Clermont)

28/11/2024 14:40

I will present the infrastructure tests and classification methods developed within the Fink broker in preparation for LSST. This work aims to provide detailed information regarding the underlying assumptions, and methods, behind each classifier. Using simulated data from the Extended LSST Astronomical Time-series Classification Challenge (ELAsTiCC), we showcase the performance of binary and...

13. LSST impact on dark matter analysis with stellar stream

Matthieu Pelissier (LPSC/UGA)

28/11/2024 15:00

Dark matter subhalos with masses from 10⁶ to 10⁹ solar masses are mostly invisible, but could impact the structure of stellar streams observed by LSST. Presentation on how LSST systematics could impact establishing constraints on alternative dark matter models thanks to stellar streams analysis.

31. StarDICE update

Jérémy Neveu (LPNHE)

28/11/2024 15:20

33. Alert pipeline

Bruno Sanchez (CPPM - CNRS)

28/11/2024 15:40

2. Probabilistic characterization of blending: application to cluster lensing cosmology

Manon Ramel (LPSC / IN2P3)

29/11/2024 09:30

The upcoming deep optical surveys, such as the Vera C. Rubin Observatory Legacy Survey of Space and Time (LSST), are set to explore the Universe to unprecedented depths, uncovering billions of galaxies. This amount of detection from the ground will lead to the apparent superposition of galaxies in the images, a phenomenon known as blending. This poses a significant challenge for the precise...

7. DC2 Cluster Detections with WaZP

Rance Solomon (LAPP)

29/11/2024 09:50

This talk focuses on the cluster detection performance in the DC2 image catalog with the WaZP cluster finder.

6. Advancements in the DESC Cluster Pipeline: Current State and Cosmological Analysis with Firecrown

eduardo barroso (LAPP)

29/11/2024 10:10

In this talk, we will see the state-of-art of the DESC Cluster pipeline and some recent improvements that have been done in Firecrown regarding the cluster shear profile analysis.

34. Insights into Gas-Galaxy Evolution in Protoclusters for the LSST Era

Sofia Gallego

29/11/2024 10:30

8. Rubin Cluster and protocluster detection and cosmology

Simona Mei

We deleveloped ML algorithms for cluster detection within DESC, and will present future projects to extend this research and the developement of algorithms for the estimation of detection selection function for cosmology. We also focus on the study of galaxy evolution in galaxy clusters and protoclusters.