ORIGINS Lensing Day

Session

Afternoon session 2

Nov 14, 2024, 4:10 PM

MIAPbP Seminar Room (MIAPbP@ORIGINS)

Conveners

Afternoon session 2

• Aymeric Galan (TUM/MPA)

Description

SBI, lens finding, lensed SN and TDE

6. Weak Lensing Cosmology using Simulation Based Inference

David Gebauer (LMU Munich)

11/14/24, 4:10 PM

Contributed talk

We present a simulation-based inference analysis framework for a higher-order weak lensing observable called the integrated 3-point correlation function. For this we have created a forward model based on N-body simulations. This forward model can create realistic shear maps including survey masks, realistic shape noise, and relevant systematic effects. Furthermore, I present a Python package...

17. A Transformer-based Foundation Model for Strong Lensing

Benjamin Holzschuh

11/14/24, 4:30 PM

Contributed talk

We present a foundation model for strong lensing based on diffusion transformers, which can solve a wide range of different simulation-based inference problems via representation learning. Image-like data such as observations are split into smaller patches, which together with their positions are embedded as tokens. Similarly, parametric models are also encoded via tokens. A strong lens system...

4. Search for strong gravitational lenses combining ground-based and space-based imaging

Alejandra Melo Melo (Max Planck Institute for Astrophysics / Technical University of Munich)

11/14/24, 4:50 PM

Contributed talk

In the past, researchers have relied on single-resolution images from individual telescopes to detect gravitational lenses. We propose a search for galaxy-galaxy lenses that, for the first time, combines high-resolution single-band images (in our case Hubble Space Telescope, HST) with low-resolution multi-band images (in our case Legacy survey, LS) using machine learning. To compensate for the...

21. Lens confirmation and machine-learning-assisted lens modelling as milestones for an effective lensed-SN follow-up

Stefan Taubenberger (TUM / MPA)

11/14/24, 5:10 PM

Contributed talk

Strongly lensed supernovae (SNe) hold great promise for measuring the expansion rate of the Universe and studying SN progenitors and environments. However, finding lensed SNe resembles searching for the needle in a haystack, and following them up is very demanding and costly due to their faintness. For the best possible use of available resources, it is thus essential that we can securely...

9. Spectroscopic and photometric time-delay inference of strongly lensed type II supernovae

Jana Grupa (Max Planck Institute for Astrophysics)

11/14/24, 5:30 PM

Contributed talk

With the upcoming start of Rubin Observatory Legacy Survey of Space and Time
(LSST), we expect to detect hundreds to thousands of strongly lensed supernovae,
which can be used for time-delay cosmography.
As part of the HOLISMOKES program, we focus on developing methods to measure time delays of strongly lensed type II supernovae (SNe II) to determine the Hubble Constant.
In my talk, I...

13. Gravitational Lensing of Tidal Disruption Events

Elias Mamuzic (Technical University of Munich / Max Planck Institute for Astrophysics)

11/14/24, 5:50 PM

In the coming years, surveys such as Rubin Observatory Legacy Survey of Space and Time (LSST) are expected to increase the number of observed tidal disruption events (TDEs) substantially. This analysis is a followup to Szekerczes, et al. (2024). We similarly employ Monte Carlo integration to calculate the TDE rate as a function of limiting magnitude. We investigate multiple black hole mass...