Search Publications
From ultraluminous X-ray sources to ultraluminous supersoft sources: NGC 55 ULX, the missing link
Fabian, A. C.; Pinto, C.; Soria, R. +8 more
In recent work with high-resolution reflection grating spectrometers (RGS) aboard XMM-Newton, Pinto et al. have discovered that two bright and archetypal ultraluminous X-ray sources (ULXs) have strong relativistic winds in agreement with theoretical predictions of high accretion rates. It has been proposed that such winds can become optically thic…
SONS: The JCMT legacy survey of debris discs in the submillimetre
Matthews, Brenda C.; Duchêne, Gaspard; Chen, Christine H. +32 more
Debris discs are evidence of the ongoing destructive collisions between planetesimals, and their presence around stars also suggests that planets exist in these systems. In this paper, we present submillimetre images of the thermal emission from debris discs that formed the SCUBA-2 Observations of Nearby Stars (SONS) survey, one of seven legacy su…
Consensus report on 25 yr of searches for damped Ly α galaxies in emission: confirming their metallicity-luminosity relation at z ≳ 2
Fynbo, J. P. U.; Møller, P.; Krogager, J. -K. +1 more
Starting from a summary of detection statistics of our recent X-shooter campaign, we review the major surveys, both space and ground based, for emission counterparts of high-redshift damped Ly α absorbers (DLAs) carried out since the first detection 25 yr ago. We show that the detection rates of all surveys are precisely reproduced by a simple mod…
Strong XUV irradiation of the Earth-sized exoplanets orbiting the ultracool dwarf TRAPPIST-1
Wheatley, Peter J.; Gillon, Michaël; Louden, Tom +2 more
We present an XMM-Newton X-ray observation of TRAPPIST-1, which is an ultracool dwarf star recently discovered to host three transiting and temperate Earth-sized planets. We find the star is a relatively strong and variable coronal X-ray source with an X-ray luminosity similar to that of the quiet Sun, despite its much lower bolometric luminosity.…
X-rays across the galaxy population - I. Tracing the main sequence of star formation
Georgakakis, A.; Aird, J.; Coil, A. L.
We use deep Chandra imaging to measure the distribution of X-ray luminosities (LX) for samples of star-forming galaxies as a function of stellar mass and redshift, using a Bayesian method to push below the nominal X-ray detection limits. Our luminosity distributions all show narrow peaks at LX ≲ 1042 erg s-1
The global history of reionization
Mesinger, Andrei; Greig, Bradley
Using a Bayesian framework, we quantify what current observations imply about the history of the epoch of reionization (EoR). We use a popular, three-parameter EoR model, flexible enough to accommodate a wide range of physically plausible reionization histories. We study the impact of various EoR observations: (I) the optical depth to the CMB meas…
BAT AGN Spectroscopic Survey (BASS) - VI. The ΓX-L/LEdd relation
Lamperti, Isabella; Schawinski, Kevin; Veilleux, Sylvain +11 more
We study the relation between accretion rate (in terms of L/LEdd) and shape of the hard X-ray spectral energy distribution (namely the photon index Γx) for a large sample of 228 hard X-ray-selected, low-redshift active galactic nuclei (AGNs), drawn from the Swift/BAT AGN Spectroscopic Survey (BASS). This includes 30 AGNs for …
The host galaxies and explosion sites of long-duration gamma ray bursts: Hubble Space Telescope near-infrared imaging
Lyman, J. D.; Bloom, J. S.; Angus, C. R. +10 more
We present the results of a Hubble Space Telescope WFC3/F160W Snapshot survey of the host galaxies of 39 long-duration gamma-ray bursts (LGRBs) at z < 3. We have non-detections of hosts at the locations of four bursts. Sufficient accuracy to astrometrically align optical afterglow images and determine the location of the LGRB within its host wa…
The AMBRE project: chemical evolution models for the Milky Way thick and thin discs
Recio-Blanco, A.; de Laverny, P.; Hayden, M. +5 more
We study the chemical evolution of the thick and thin discs of the Galaxy by comparing detailed chemical evolution models with recent data from the Archéologie avec Matisse Basée sur les aRchives de l'ESO project. The data suggest that the stars in the thick and thin discs form two distinct sequences with the thick disc stars showing higher [α/Fe]…
Lens modelling Abell 370: crowning the final frontier field with MUSE
Mahler, Guillaume; Richard, Johan; Schmidt, Kasper B. +8 more
We present a strong lensing analysis on the massive cluster Abell 370 (A370; z = 0.375), using a combination of deep multiband Hubble Space Telescope (HST) imaging and Multi-Unit Spectroscopic Explorer (MUSE) spectroscopy. From only 2 h of the MUSE data, we are able to measure 120 redshifts in the southern BCG area, including several multiply imag…