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IoA Institute of Astronomy Talk Lists

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This is a List of Talks Lists that is a List of all IoA Seminars, Colloquia, Extra talks, IoA Stellar Pops and Extragalactic Gathering, etc. It is used as a feed for the IOA website and Digital Display screens. Individual Talks should NOT be added to this Talk lists. They should be added to one of the series that feed this list.
URL: https://talks.cam.ac.uk/show/index/13724
Updated: 17 min 19 sec ago

Thu 23 Oct 16:00: The Beautiful Confusion: Super-Early Galaxies Seen By JWST

Thu, 25/09/2025 - 15:34
The Beautiful Confusion: Super-Early Galaxies Seen By JWST

One of the major surprises provided by the first three years of early Universe observations by JWST has been the detection of a stunning overabundance of luminous, and likely massive, galaxies at redshift z10. As the first spectroscopic confirmations are accumulating, it is crucial and timely to investigate these important and yet unknown aspects of early galaxy formation and evolution. At a time at which ALMA has laid the foundations of our understanding, Webb seems to hint at a possibly conflicting scenario. These (apparent?) contradictions need to be solved in the framework of studies that combine theory, cosmological simulations and the most advanced IR/sub-mm observations. I will analyze possible new scenarios and propose preliminary answers to the above questions.

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Fri 05 Dec 11:30: Exploring the Cosmos with Hydrogen Observation

Thu, 25/09/2025 - 07:34
Exploring the Cosmos with Hydrogen Observation

Abstract not available

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Tue 14 Oct 13:00: The Nature of Rocky Exoplanets Via Study of White Dwarf Stars

Wed, 24/09/2025 - 18:15
The Nature of Rocky Exoplanets Via Study of White Dwarf Stars

Venerable Exoplanetary Systems, a brief history: Revelations from 100 years ago to some new discoveries via an unusual, entirely unanticipated, observational technique. The discussion will include the first ever observational evidence for the existence of an extrasolar planetary system, the first observational evidence for the existence of a differentiated extrasolar planet (i.e., one with a crust and mantle), and the remarkable discovery of objects with 100s of times larger abundances of the light elements Be and B than previously seen in any astronomical object.

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Tue 14 Oct 13:00: The Nature of Rocky Exoplanets Via Study of White Dwarf Stars

Wed, 24/09/2025 - 09:39
The Nature of Rocky Exoplanets Via Study of White Dwarf Stars

Venerable Exoplanetary Systems, a brief history: Revelations from 100 years ago to some new discoveries via an unusual, entirely unanticipated, observational technique.

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Thu 09 Oct 16:00: Looking into the faintest with MUSE: Integral-field spectroscopy of ultradiffuse galaxies in a cluster environment

Wed, 24/09/2025 - 09:35
Looking into the faintest with MUSE: Integral-field spectroscopy of ultradiffuse galaxies in a cluster environment

In this talk I would like to present the LEWIS project. Looking into the faintEst WIth MUSE (LEWIS) is an ESO large program, granted with 133.5hrs with MUSE @ESO-VLT., is the first homogeneous integral-field spectroscopic survey of 30 extremely low-surface-brightness (LSB) galaxies in the Hydra I cluster of galaxies, where the majority of LSB galaxies in the sample (22 in total) are ultra-diffuse galaxies (UDGs). Because of their LSB nature, getting spectroscopic data for UDGs is a challenging task. To date, as opposed to the availability of deep images, we still lack a statistically significant sample of UDGs with spectroscopy, which strongly limits our constraints and conclusions on their stellar populations and DM content. Doubling the number of spectroscopically studied UDGs, with the LEWIS project we will make a decisive impact in this field. With LEWIS we will map, for the first time, i) the 2D stellar kinematics, ii) the stellar population and iii) established the GC population and their specific frequency of a complete sample of UDGs in a galaxy cluster with IF spectroscopic data. The structural properties together with the baryonic versus DM fraction are used in comparison with hydrodynamical models of UDGs to establish their formation channels as a function of their location in the cluster. With LEWIS we are probing the MUSE capabilities to map the galaxy structure down to the faintest surface brightness levels.

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Thu 16 Oct 16:00: Star Formation at the Epoch of Reionisation under the Cosmic Microscope

Mon, 22/09/2025 - 15:08
Star Formation at the Epoch of Reionisation under the Cosmic Microscope

How did galaxies start forming stars? What are the conditions in typical low-mass, star-forming galaxies at z8 and above? Recent observations with JWST indicate several critical puzzles in studies that address these questions. Chief among these, galaxies started forming stars early and possibly at an extraordinary rate and in more compact clumps than previously thought. I will present the latest results from the JWST Bullet Cluster observations, which we will use to measure the properties of dark matter. I will also show the discovery of a highly magnified z=11 lensed arc. The intrinsic luminosity of the galaxy is 0.05L*, making it the lowest luminosity spectroscopically confirmed galaxy at z>10 discovered to date. The galaxy contains three star-forming components with sizes of 10 remarkably compact globular-cluster-like clumps and spectroscopically confirmed Little Red Dots with strong AGN signatures. All these results allow the detailed studies of star formation at sub-10pc scales at the epoch of reionisation.

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Fri 30 Jan 11:30: Shining a light on the origin of supermassive black holes with cosmological simulations

Thu, 18/09/2025 - 08:17
Shining a light on the origin of supermassive black holes with cosmological simulations

Abstract not available

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Fri 30 Jan 11:30: Title to be confirmed

Wed, 17/09/2025 - 16:41
Title to be confirmed

Abstract not available

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Fri 10 Oct 11:30: Where You Live Matters: Host Galaxy Insights into Transient Progenitors

Wed, 17/09/2025 - 11:07
Where You Live Matters: Host Galaxy Insights into Transient Progenitors

Abstract not available

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Fri 17 Oct 11:30: Novel approaches to simulating the observable Universe

Wed, 17/09/2025 - 11:06
Novel approaches to simulating the observable Universe

Abstract not available

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Fri 21 Nov 11:30: Early Massive Galaxies and Scaled-Up LRDs: Clues from Euclid and JWST

Tue, 16/09/2025 - 12:43
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.

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Fri 12 Dec 11:30: Title to be confirmed

Wed, 10/09/2025 - 14:45
Title to be confirmed

Abstract not available

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Fri 31 Oct 11:30: Mapping the Cosmic Web in Lyα emission around quasars and non-AGN galaxies

Wed, 10/09/2025 - 08:15
Mapping the Cosmic Web in Lyα emission around quasars and non-AGN galaxies

Abstract not available

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Fri 14 Nov 11:30: From Primordial Magnetic Fields to AGN-Driven Magnetized Outflows

Wed, 10/09/2025 - 08:11
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.

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Fri 31 Oct 11:30: Title to be confirmed

Tue, 09/09/2025 - 14:01
Title to be confirmed

Abstract not available

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Fri 10 Oct 11:30: Novel approaches to simulating the observable Universe

Tue, 09/09/2025 - 14:00
Novel approaches to simulating the observable Universe

Abstract not available

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Fri 03 Oct 11:30: Probing early star formation and ionized bubble growth with JWST

Tue, 09/09/2025 - 12:16
Probing early star formation and ionized bubble growth with JWST

Abstract not available

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Mon 08 Dec 16:00: Title to be confirmed

Mon, 08/09/2025 - 21:54
Title to be confirmed

Abstract not available

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Fri 26 Sep 11:30: The curious case of metal-poor DLAs at cosmic noon

Mon, 01/09/2025 - 21:26
The curious case of metal-poor DLAs at cosmic noon

Abstract not available

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Fri 24 Oct 11:30: Learning galaxy properties with machine learning and simulation based inference

Fri, 29/08/2025 - 12:02
Learning galaxy properties with machine learning and simulation based inference

Abstract not available

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