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Cosmic evolution of radio-AGN feedback: confronting models with data
(2023-08-30)
Radio-mode feedback is a key ingredient in galaxy formation and evolution models, required to reproduce the observed properties of massive galaxies in the local Universe. We study the cosmic evolution of radio-active ...
A variable active galactic nucleus at $z=2.06$ triply-imaged by the galaxy cluster MACS J0035.4-2015
(2023-07-31)
We report the discovery of a triply imaged active galactic nucleus (AGN), lensed by the galaxy cluster MACS J0035.4−2015 (z d = 0.352). The object is detected in Hubble Space Telescope imaging taken for the RELICS program. ...
Carbonaceous dust grains seen in the first billion years of cosmic time
(2023-07-19)
Large dust reservoirs (up to approximately 10 8 M ⊙) have been detected 1–3 in galaxies out to redshift z ≃ 8, when the age of the Universe was only about 600 Myr. Generating substantial amounts of dust within such a short ...
The ionising photon production efficiency at z~6 for Lyman-alpha emitters using JEMS and MUSE
(2023-06-15)
We study the ionising photon production efficiency at the end of the Epoch of Reionisation ($z \sim 5.4 - 6.6$) for a sample of 30 Lyman-$\alpha$ emitters. This is a crucial quantity to infer the ionising photon budget of ...
VICTORIA project: The LOFAR HBA Virgo Cluster Survey
(2023-06-02)
Context. The Virgo cluster is the nearest (d = 16.5 Mpc) massive (M ≥ 1014 M⊙) galaxy cluster and is therefore a prime target for studying astrophysical processes in dense large-scale environments. In the radio band, we ...
Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems
(2023-06-01)
Disintegrating multiple systems have been previously discovered from kinematic studies of the $\it Hipparcos$ catalogue. They are presumably the result of dynamical encounters taking place in the Galactic disk between ...
VISIONS: The VISTA Star Formation Atlas
(2023-05-31)
VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The ...
The LOFAR Two-metre Sky Survey: the radio view of the cosmic star formation history
(2023-05-26)
We present a detailed study of the cosmic star formation history over $90$ per cent of cosmic time ($0\lesssim z\lesssim4$), using deep, radio continuum observations that probe star formation activity independent of dust. ...
The Andromeda Galaxy’s Last Major Merger: Constraints from the survey of Planetary Nebulae
(The International Astronomical Union, 2023-05-04)
The Andromeda galaxy (M 31) has experienced a tumultuous merger history as evidenced by the many substructures present in its inner halo. We use planetary nebulae (PNe) as chemodynamic tracers to shed light on the recent ...
Spectroscopic confirmation of four metal-poor galaxies at z=10.3-13.2
(2023-05)
Finding and characterizing the first galaxies that illuminated the early universe at cosmic dawn is pivotal to understand the physical conditions and the processes that led to the formation of the first stars. In the first ...