Search Publications
A dust twin of Cas A: cool dust and 21 µm silicate dust feature in the supernova remnant G54.1+0.3
Rho, J.; Smith, M. W. L.; Gomez, H. L. +6 more
We present infrared (IR) and submillimetre observations of the Crab-like supernova remnant (SNR) G54.1+0.3 including 350µm (SHARC-II), 870µm (LABOCA), 70, 100, 160, 250, 350, and 500 µm (Herschel), and 3-40 µm (Spitzer). We detect dust features at 9, 11, and 21 µm and a long-wavelength continuum dust component. The 21…
Gaia unveils the kinematics of multiple stellar populations in 47 Tucanae
Milone, A. P.; Marino, A. F.; Lagioia, E. P. +1 more
The series of events, which occurred at high redshift and originated multiple stellar populations in Globular Clusters (GCs) are still poorly understood. Theoretical work suggests that the present-day dynamics of stars in nearby GCs, including the rotation and velocity dispersion, may retain important clues on the formation of multiple populations…
ALMA view of a massive spheroid progenitor: a compact rotating core of molecular gas in an AGN host at z = 2.226
Cimatti, A.; Daddi, E.; Pozzi, F. +16 more
We present ALMA observations at 107.291 GHz (band 3) and 214.532 GHz (band 6) of GMASS 0953, a star-forming galaxy at z = 2.226 hosting an obscured active galactic nucleus (AGN) that has been proposed as a progenitor of compact quiescent galaxies (QGs). We measure for the first time the size of the dust and molecular gas emission of GMASS 0953 tha…
The structure of post-starburst galaxies at 0.5 < z < 2: evidence for two distinct quenching routes at different epochs
Simpson, Chris; Wild, Vivienne; Almaini, Omar +5 more
We present an analysis of the structure of post-starburst (PSB) galaxies in the redshift range 0.5 < z < 2, using a photometrically selected sample identified in the Ultra Deep Survey field. We examine the structure of ∼80 of these transient galaxies using radial light µ(r) profiles obtained from CANDELS Hubble Space Telescope near-inf…
LOFAR-Boötes: properties of high- and low-excitation radio galaxies at 0.5 < z < 2.0
Prandoni, I.; White, G. J.; Tasse, C. +13 more
This paper presents a study of the redshift evolution of radio-loud active galactic nuclei (AGN) as a function of the properties of their galaxy hosts in the Boötes field. To achieve this we match low-frequency radio sources from deep 150-MHz LOFAR (LOw Frequency ARray) observations to an I-band-selected catalogue of galaxies, for which we have de…
Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
Hamann, Fred; Nardini, Emanuele; Reeves, James +1 more
The quasar PDS 456 (at redshift ∼0.184) has a prototype ultra-fast outflow (UFO) measured in X-rays. This outflow is highly ionized with relativistic speeds, large total column densities log NH(cm-2) > 23, and large kinetic energies that could be important for feedback to the host galaxy. A UV spectrum of PDS 456 obtained …
On the UV compactness and morphologies of typical Lyman α emitters from z ∼ 2 to z ∼ 6
Sobral, David; Matthee, Jorryt; Paulino-Afonso, Ana +8 more
We investigate the rest-frame UV morphologies of a large sample of Lyman α emitters (LAEs) from z ∼ 2 to z ∼ 6, selected in a uniform way with 16 different narrow and medium bands over the full COSMOS field. We use 3045 LAEs with Hubble Space Telescope coverage in a stacking analysis and find that they have MUV ∼ -20, below M_UV^\ast at…
Gaia reveals evidence for merged white dwarfs
Hambly, N. C.; Rowell, N.; Genest-Beaulieu, C. +2 more
We use Gaia Data Release 2 to identify 13 928 white dwarfs (WDs) within 100 pc of the Sun. The exquisite astrometry from Gaia reveals for the first time a bifurcation in the observed WD sequence in both Gaia and the Sloan Digital Sky Survey (SDSS) passbands. The latter is easily explained by a helium atmosphere WD fraction of 36 per cent. However,…
The dusty progenitor star of the Type II supernova 2017eaw
Kilpatrick, Charles D.; Foley, Ryan J.
We present pre-explosion photometry of the likely progenitor star of the Type II supernova (SN II) 2017eaw in NGC 6946. We use a Hubble Space Telescope (HST) image of SN 2017eaw to perform relative astrometry with HST and Spitzer Space Telescope (Spitzer) imaging, finding a single point source consistent with its position. We detect the progenitor…
The XUV environments of exoplanets from Jupiter-size to super-Earth
Kirk, James; Wheatley, Peter J.; Louden, Tom +8 more
Planets that reside close-in to their host star are subject to intense high-energy irradiation. Extreme-ultraviolet (EUV) and X-ray radiation (together, XUV) is thought to drive mass-loss from planets with volatile envelopes. We present XMM-Newton observations of six nearby stars hosting transiting planets in tight orbits (with orbital period, P