Search Publications
Finding counterparts for all-sky X-ray surveys with NWAY: a Bayesian algorithm for cross-matching multiple catalogues
Salvato, M.; Buchner, J.; Nandra, K. +6 more
We release the AllWISE counterparts and Gaia matches to 106 573 and 17 665 X-ray sources detected in the ROSAT 2RXS and XMMSL2 surveys with |b| > 15°. These are the brightest X-ray sources in the sky, but their position uncertainties and the sparse multi-wavelength coverage until now rendered the identification of their counterparts a demanding…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters - XVII. Public Catalogue Release
Anderson, J.; Milone, A. P.; Marino, A. F. +13 more
In this paper, we present the astrophotometric catalogues of 56 globular clusters and one open cluster. Astrometry and photometry are mainly based on images collected within the `HST Legacy Survey of Galactic Globular Clusters: Shedding UV Light on Their Populations and Formation' (GO-13297, PI: Piotto), and the `ACS Survey of Galactic Globular Cl…
The BAHAMAS project: the CMB-large-scale structure tension and the roles of massive neutrinos and galaxy formation
Schaye, Joop; van Waerbeke, Ludovic; McCarthy, Ian G. +3 more
Recent studies have presented evidence for tension between the constraints on Ωm and σ8 from the cosmic microwave background (CMB) and measurements of large-scale structure (LSS). This tension can potentially be resolved by appealing to extensions of the standard model of cosmology and/or untreated systematic errors in the mo…
High-redshift AGN in the Chandra Deep Fields: the obscured fraction and space density of the sub-L* population
Lehmer, B. D.; Brandt, W. N.; Vignali, C. +14 more
We investigate the population of high-redshift (3 ≤ z < 6) active galactic nuclei (AGN) selected in the two deepest X-ray surveys, the 7 Ms Chandra Deep Field-South and 2 Ms Chandra Deep Field-North. Their outstanding sensitivity and spectral characterization of faint sources allow us to focus on the sub-L* regime (logLX ≲…
Constraining the mass and radius of neutron stars in globular clusters
Heinke, C. O.; Ho, W. C. G.; Bogdanov, S. +4 more
We analyse observations of eight quiescent low-mass X-ray binaries in globular clusters and combine them to determine the neutron star mass-radius curve and the equation of state of dense matter. We determine the effect that several uncertainties may have on our results, including uncertainties in the distance, the atmosphere composition, the neut…
Clarifying the Hubble constant tension with a Bayesian hierarchical model of the local distance ladder
Feeney, Stephen M.; Mortlock, Daniel J.; Dalmasso, Niccolò
Estimates of the Hubble constant, H0, from the local distance ladder and from the cosmic microwave background (CMB) are discrepant at the ∼3σ level, indicating a potential issue with the standard Λ cold dark matter (ΛCDM) cosmology. A probabilistic (i.e. Bayesian) interpretation of this tension requires a model comparison calculation, w…
Strong-lensing analysis of A2744 with MUSE and Hubble Frontier Fields images
Inami, H.; Schmidt, K.; Mahler, G. +13 more
We present an analysis of Multi Unit Spectroscopic Explorer (MUSE) observations obtained on the massive Frontier Fields (FFs) cluster A2744. This new data set covers the entire multiply imaged region around the cluster core. The combined catalogue consists of 514 spectroscopic redshifts (with 414 new identifications). We use this redshift informat…
Modelling chemical abundance distributions for dwarf galaxies in the Local Group: the impact of turbulent metal diffusion
Faucher-Giguère, Claude-André; Hopkins, Philip F.; Wetzel, Andrew +6 more
We investigate stellar metallicity distribution functions (MDFs), including Fe and α-element abundances, in dwarf galaxies from the Feedback in Realistic Environment (FIRE) project. We examine both isolated dwarf galaxies and those that are satellites of a Milky Way-mass galaxy. In particular, we study the effects of including a sub-grid turbulent…
Imprints of white dwarf recoil in the separation distribution of Gaia wide binaries
Rix, Hans-Walter; El-Badry, Kareem
We construct from Gaia DR2 an extensive and very pure ({≲ } 0.2{{ per cent}} contamination) catalogue of wide binaries containing main-sequence (MS) and white dwarf (WD) components within 200 pc of the Sun. The public catalogue contains, after removal of clusters and resolved higher order multiples, > 50 000 MS/MS, > 3000 WD/MS, and nearly 4…
Systematic study of magnetar outbursts
Esposito, Paolo; Rea, Nanda; Coti Zelati, Francesco +2 more
We present the results of the systematic study of all magnetar outbursts observed to date, through a reanalysis of data acquired in about 1100 X-ray observations. We track the temporal evolution of the outbursts' soft X-ray spectral properties and the luminosities of the single spectral components as well as of the total emission. We model empiric…