Search Publications
The discovery of rest-frame UV colour gradients and a diversity of dust morphologies in bright z ≃ 7 Lyman-break galaxies
Bowler, R. A. A.; Cullen, F.; McLure, R. J. +2 more
We present deep ALMA dust continuum observations for a sample of luminous (MUV < -22) star-forming galaxies at z ≃ 7. We detect five of the six sources in the far-infrared (FIR), providing key constraints on the obscured star formation rate (SFR) and the infrared-excess-β (IRX-β) relation without the need for stacking. Despite the ga…
Implications for galaxy formation models from observations of globular clusters around ultra-diffuse galaxies
Beasley, Michael A.; Trujillo, Ignacio; Peletier, Reynier F. +5 more
We present an analysis of Hubble Space Telescope observations of globular clusters (GCs) in six ultradiffuse galaxies (UDGs) in the Coma cluster, a sample that represents UDGs with large effective radii (Re), and use the results to evaluate competing formation models. We eliminate two significant sources of systematic uncertainty in the…
MHD disc winds can reproduce fast disc dispersal and the correlation between accretion rate and disc mass in Lupus
Lodato, G.; van Dishoeck, E. F.; Tabone, B. +3 more
The final architecture of planetary systems depends on the extraction of angular momentum and mass-loss processes of the discs in which they form. Theoretical studies proposed that magnetohydrodynamic winds launched from the discs (MHD disc winds) could govern accretion and disc dispersal. In this work, we revisit the observed disc demographics in…
A deep survey of short GRB host galaxies over z 0-2: implications for offsets, redshifts, and environments
Troja, E.; Cenko, S. B.; Sakamoto, T. +10 more
A significant fraction (30 per cent) of well-localized short gamma-ray bursts (sGRBs) lack a coincident host galaxy. This leads to two main scenarios: (i) that the progenitor system merged outside of the visible light of its host, or (ii) that the sGRB resided within a faint and distant galaxy that was not detected by follow-up observations. Discr…
A 5 per cent measurement of the Hubble-Lemaître constant from Type II supernovae
Zheng, W.; Galbany, L.; Filippenko, A. V. +4 more
The most stringent local measurement of the Hubble-Lemaître constant from Cepheid-calibrated Type Ia supernovae (SNe Ia) differs from the value inferred via the cosmic microwave background radiation (Planck+ΛCDM) by ~5σ. This so-called Hubble tension has been confirmed by other independent methods, and thus does not appear to be a possible consequ…
The effect of returning radiation on relativistic reflection
Reynolds, C. S.; Dauser, T.; Wilms, J. +5 more
We study the effect of returning radiation on the shape of the X-ray reflection spectrum in the case of thin accretion discs. We show that the returning radiation mainly influences the observed reflection spectrum for a large black hole spin (a > 0.9) and a compact primary source of radiation close to the black hole at height h < 5rg
The kinematic properties of Milky Way stellar halo populations
Bovy, Jo; Lane, James M. M.; Mackereth, J. Ted
In the Gaia era, stellar kinematics are extensively used to study Galactic halo stellar populations, to search for halo structures, and to characterize the interface between the halo and hot disc populations. We use distribution function-based models of modern data sets with 6D phase space data to qualitatively describe a variety of kinematic spac…
A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS
Lester, Kathryn V.; Charnoz, Sébastien; Triaud, Amaury H. M. J. +132 more
We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed and retrieved the CHaracterising ExOPlanets Satellite (CHEOPS), TESS, and ground-based photometry, …
Being KLEVER at cosmic noon: Ionized gas outflows are inconspicuous in low-mass star-forming galaxies but prominent in massive AGN hosts
Maiolino, Roberto; Cresci, Giovanni; Jones, Gareth C. +13 more
We investigate the presence of ionized gas outflows in a sample of 141 main-sequence star-forming galaxies at 1.2 < z < 2.6 from the KLEVER (KMOS Lensed Emission Lines and VElocity Review) survey. Our sample covers an exceptionally wide range of stellar masses, 8.1 < log (M⋆/M⊙) < 11.3, pushing outflow studies int…
Results from The COPAINS Pilot Survey: four new BDs and a high companion detection rate for accelerating stars
Sozzetti, A.; Scholz, A.; Desidera, S. +7 more
The last decade of direct imaging (DI) searches for sub-stellar companions has uncovered a widely diverse sample that challenges the current formation models, while highlighting the intrinsically low occurrence rate of wide companions, especially at the lower end of the mass distribution. These results clearly show how blind surveys, crucial to co…