Fri 30 Jan 11:30: Shining a light on the origin of supermassive black holes with cosmological simulations
Abstract not available
- Speaker: Sophie Koudmani (Hertfordshire)
- Friday 30 January 2026, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 30 Jan 11:30: Title to be confirmed
Abstract not available
- Speaker: Sophie Koudmani (Hertfordshire)
- Friday 30 January 2026, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 10 Oct 11:30: Where You Live Matters: Host Galaxy Insights into Transient Progenitors
Abstract not available
- Speaker: Nikhil Sarin (KICC)
- Friday 10 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 17 Oct 11:30: Novel approaches to simulating the observable Universe
Abstract not available
- Speaker: Chris Lovell (KICC)
- Friday 17 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 21 Nov 11:30: Early Massive Galaxies and Scaled-Up LRDs: Clues from Euclid and JWST
The formation of massive galaxies in the first billion years of cosmic time is one of the most remarkable findings of Extragalactic Astronomy and challenges the predictions of galaxy formation models. Finding the right candidates is the first step towards understanding how such efficient galaxy formation could have happened at early cosmic time. Another, a priori completely different, high-z galaxy population whose formation is also very puzzling are the so-called ‘Little Red Dots (LRDs)’. Discovered almost by chance in JWST galaxy surveys, most of these objects appear to host overgrown super-massive black holes. An intriguing issue is how bright and extreme these objects could be. In the first part of this talk, I will present the results of our search of massive galaxy candidates at the end of the Epoch of Reionization using the first set of Euclid images over several tens of square degrees of the sky. I will also discuss the presence of massive galaxies in JWST surveys at similar redshifts and the coherence of all results in a common context. In the second part of my talk, I will present our results on the study of Euclid sources with double-power-law spectral energy distributions at z>4 in the COSMOS field, where the Euclid data has already a depth very similar to the final expected depth of the Euclid Deep Surveys. I will discuss the presence of scaled-up LRD candidates, identified based on their compactness, and their derived properties in comparison to those of classical JWST -selected LRDs. Finally, I will conclude by discussing whether LRDs could also eventually give rise to massive galaxy formation.
- Speaker: Karina Caputi (Groningen)
- Friday 21 November 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 12 Dec 11:30: Title to be confirmed
Abstract not available
- Speaker: Madalina Tudorache (IoA)
- Friday 12 December 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 31 Oct 11:30: Mapping the Cosmic Web in Lyα emission around quasars and non-AGN galaxies
Abstract not available
- Speaker: Davide Tornotti (Milan)
- Friday 31 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 14 Nov 11:30: From Primordial Magnetic Fields to AGN-Driven Magnetized Outflows
Magnetic fields are ubiquitous across cosmic scales, yet their role in galaxy formation remains elusive. In this talk, I show that primordial magnetic fields, originating before the end of recombination, can amplify small perturbations, accelerating the collapse of the first dark matter halos. This results in an early onset and efficient star formation, consistent with JWST observations. However, primordial fields are not the only source of magnetization at high redshifts. Using RAMSES -RTMHD cosmological simulations, I compare the role of primordial fields and AGN -driven outflows in shaping the magnetic landscape of the high-redshift universe.
- Speaker: Mahsa Sanati (Oxford)
- Friday 14 November 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 31 Oct 11:30: Title to be confirmed
Abstract not available
- Speaker: Davide Tornotti (Milan)
- Friday 31 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 10 Oct 11:30: Novel approaches to simulating the observable Universe
Abstract not available
- Speaker: Chris Lovell (KICC)
- Friday 10 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 03 Oct 11:30: Probing early star formation and ionized bubble growth with JWST
Abstract not available
- Speaker: Lily Whitler (KICC)
- Friday 03 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Mon 08 Dec 16:00: Title to be confirmed
Abstract not available
- Speaker: Joshua Speagle (Univ. of Toronto)
- Monday 08 December 2025, 16:00-17:00
- Venue: Martin Ryle Seminar Room, KICC.
- Series: Astro Data Science Discussion Group; organiser: km723.
Fri 26 Sep 11:30: The curious case of metal-poor DLAs at cosmic noon
Abstract not available
- Speaker: Louise Welsh (Durham)
- Friday 26 September 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 24 Oct 11:30: Learning galaxy properties with machine learning and simulation based inference
Abstract not available
- Speaker: Michele Ginolfi (Florence)
- Friday 24 October 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 14 Nov 11:30: Physics of Ultra-Faint Dwarfs
Abstract not available
- Speaker: Mahsa Sanati (Oxford)
- Friday 14 November 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 28 Nov 11:30: Dwarf Galaxies in the Local Universe
Abstract not available
- Speaker: Amandine Doliva-Dolinsky (Surrey)
- Friday 28 November 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 07 Nov 11:30: JWST Spectroscopic Insights Into the Evolution and Diversity of Galaxies within the First Billion Years
Abstract not available
- Speaker: Guido Roberts-Borsani (UCL)
- Friday 07 November 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 28 Nov 11:30: Local satellite galaxies
Abstract not available
- Speaker: Amandine Doliva-Dolinsky (Surrey)
- Friday 28 November 2025, 11:30-12:30
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Fri 07 Nov 10:00: JWST Spectroscopic Insights Into the Evolution and Diversity of Galaxies within the First Billion Years
Abstract not available
- Speaker: Guido Roberts-Borsani (UCL)
- Friday 07 November 2025, 10:00-11:00
- Venue: Ryle Seminar Room, KICC + online.
- Series: Galaxies Discussion Group; organiser: Sandro Tacchella.
Tue 23 Sep 13:00: Planetary Evolution Across Stellar Lifetimes
Over the past thirty years, nearly 6,000 planets have been confirmed. These systems provide key insights into how planet populations evolve over time, sculpted by planetary dynamics and stellar processes. Such mechanisms can drive dramatic changes on the planet and, in extreme cases, lead to its destruction. However, there are many gaps in our understanding of the evolution of planetary systems. In particular, the ultimate fate of these systems as their host stars evolve off the main sequence remains largely unknown. In this talk, I will present my work probing the mechanisms that shape planets over their lifetime. First, I will examine the impact of migration and photoevaporation on main-sequence systems. The recently confirmed planet, TOI -5800 b, provides a unique case study of an eccentric sub-Neptune on a close-in orbit, and may provide insight into how evolutionary processes contribute to population-level features such as the Neptunian desert. Second, I will describe how stellar evolution transforms planetary systems. In addition to destroying inner planets and dramatically altering the dynamics of outer planets, this process may also fundamentally alter the atmospheric composition of giant planets through a phase called common envelope evolution. Finally, I will discuss the ultimate fate of planet populations as their host stars evolve to their final state as white dwarfs. Even in these mature systems, planets can be destroyed through scattering into their host’s Roche radius, leaving an observational signature called “pollution.” I will also highlight ongoing efforts to probe the surviving planet population around white dwarf stars with JWST .
- Speaker: Sydney Jenkins, MIT
- Tuesday 23 September 2025, 13:00-14:00
- Venue: Ryle seminar room + ONLINE - Details to be sent by email.
- Series: Exoplanet Seminars; organiser: Max Sommer.