Séminaire Doctoral / Seminar PhD |
| « The NEW High-Redshift Frontier » |
|
Lukas Furtak |
|
So ever since the advent of the JWST last year it seems like everyone suddenly became a high-redshift scientist over night... And while the blank-field boys and girls are having their fun snooping around in CEERS, JADES and COSMOS-Web, the real thing is of course happening in cluster-lensed deep-fields. It is after all well known that observing a source which is not strongly lensed is a waste of precious telescope time. Thanks to the strong gravitational lensing effect of massive galaxy clusters, we can observe the early Universe in depths and detail unachievable in blank fields. Over the past year, cluster lenses have delivered not only the deepest images of the Universe ever taken, but also the first representatives of a new kind of AGN and the most distant galaxy observed to date. What is more, thanks to the extreme magnifications achieved at the critical lines, we can observe even single stars at cosmological distances. Unfortunately, lensing is... complicated and can be confusing for the non-initiates or indeed those who studied it their whole life.
So, if you are a newly arrived high-redshift scientist who just jumped onto the JWST train, a casual follower of developments on the high-redshift frontier or just came to see what all the fuss is about and perhaps grab a snack, strap in and let me show you what strong lensing can really do when done properly. From stars to AGN, cluster lensing achieved a lot in just one year of JWST operations, and will do even more in the coming years. In my talk, I will tell you about dark matter, caustic-crossing events, kaijus, high-redshift AGN, even higher-redshift galaxies, cosmology, a Cantabrian nightmare, dogs and supernovae. From stellar physics to resolving the Hubble tension, lensing can do pretty much everything -- cool huh? |
|
vendredi 20 octobre 2023 - 16:00 Salle Entresol Daniel Chalonge, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |