Description
Chair: Diane Feuillet
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Johanna Hartke (University of Turku)28/05/2026, 16:45Oral
Massive galaxies are crucial for understanding how matter is assembled in the Universe as they contain more than half of the stars in today’s Universe and are also the birthplace of many chemical elements. A few billion years after the Big Bang, intense star formation episodes created so-called red nuggets: ultra-compact massive galaxies that grew into the massive early-type galaxies that we...
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Avinash Chaturvedi (Leibniz Institute for Astrophysics)28/05/2026, 17:00Oral
Massive early-type galaxies (ETGs) represent the final stages of galaxy evolution in the hierarchical formation framework. They typically host central supermassive black holes (SMBHs), which co-evolve with their galaxies and provide an excellent opportunity to investigate the linked growth of black holes and ETGs. Using integral-field spectroscopic data (MUSE, SINFONI) and triaxial...
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Markus Anetjärvi28/05/2026, 17:15Oral
Recent mass models of massive early-type galaxies (ETGs) have revealed compact, central mass-to-light (M/L) gradients, potentially indicating variations in the stellar populations and/or initial stellar mass function. These gradients may be linked to in-situ and ex-situ stellar components, as supported by the two-phase formation scenario. Such multiple-component systems challenge "classical"...
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Mr Max Mattero (University of Helsinki)28/05/2026, 17:30Oral
Observations using the JWST have shown that high-redshift massive quiescent galaxies (MQGs) are both more numerous and form earlier than previously thought. Owing to their high stellar masses and extreme central densities early on in cosmic history (z > 3), they are likely progenitors of the so-called red nugget galaxies at z~2, which in turn are thought to evolve into the cored, massive...
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Atte Keitaanranta (University of Helsinki)28/05/2026, 17:45Oral
Some recent cosmological simulations have started to model the dynamics of supermassive black holes (SMBHs) with dynamical friction subgrid models instead of repositioning. Such simulations predict a population of wandering black holes in massive galaxies, with the most massive systems including more than a thousand wandering black holes. We run a series of cosmological zoom-in simulations...
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Venla Kangas (University of Turku)28/05/2026, 18:00Oral
When a star passes too close to a supermassive black hole, it gets disrupted and torn apart by the tidal forces in an event known as a tidal disruption event (TDE). The emission from TDEs is observed across the electromagnetic spectrum, with the majority discovered in ultraviolet and optical wavelengths. However, an increasing number of TDEs have been observed to exhibit long-lasting infrared...
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