Institution
Royal Observatory
Recent research
- Physics & SpaceOpen access
Abstract We present a homogeneous catalogue of ages, metallicities, distances, and reddenings for 5 056 open clusters in the Unified Cluster Catalogue (UCC), derived uniformly from Gaia Data Release 3 (DR3) colour–magnitude diagrams via Bayesian nested sampling with PARSEC isochr...
- Physics & SpaceOpen access
Clustering effects on the Dark Siren determination of H 0: A simulation study
Abstract We investigate the cosmological power of gravitational wave (GWs) events without electromagnetic counterparts using high-resolution, cosmological simulations that include realistic clustering. We assume a near-future detector network (LVK + LIGO India in O5), with sky lo...
- Physics & SpaceOpen access
Episodic super-Eddington accretion as a clue to Overmassive Black Holes in the early Universe
Abstract Early JWST observations are providing growing evidence for a ubiquitous population of accreting supermassive black holes (BHs) at high redshift, many of which appear overmassive compared to the empirically-derived local scaling relation between black hole mass and host g...
- Physics & SpaceOpen access
Evidence of a massive accretion event 1.8 billion years before the Gaia-Sausage-Enceladus merger
Abstract The merger history of the Galaxy has been traced back firmly to a redshift of 2 (10 billion years ago). While evidence for the existence of at least one more substantial merger before this time has been presented, its interpretation is yet to be fully established. Here w...