Search Publications
Two-dimensional kinematics of SLACS lenses - III. Mass structure and dynamics of early-type lens galaxies beyond z ≃ 0.1
Treu, Tommaso; Czoske, Oliver; Koopmans, Léon V. E. +2 more
We combine in a self-consistent way the constraints from both gravitational lensing and stellar kinematics to perform a detailed investigation of the internal mass distribution, amount of dark matter, and dynamical structure of the 16 early-type lens galaxies from the SLACS Survey, at z = 0.08 - 0.33, for which both HST/ACS and NICMOS high-resolut…
Discovery of the nearby long, soft GRB 100316D with an associated supernova
Sakamoto, T.; Covino, S.; D'Avanzo, P. +43 more
We report the Swift discovery of the nearby long, soft gamma-ray burst GRB 100316D, and the subsequent unveiling of its low-redshift host galaxy and associated supernova. We derive the redshift of the event to be z= 0.0591 ± 0.0001 and provide accurate astrometry for the gamma-ray burst (GRB) supernova (SN). We study the extremely unusual prompt e…
A robust sample of galaxies at redshifts 6.0<z<8.7: stellar populations, star formation rates and stellar masses
Bowler, R. A. A.; McLure, R. J.; Dunlop, J. S. +7 more
We present the results of a photometric redshift analysis designed to identify z≥ 6 galaxies from the near-infrared Hubble Space Telescope imaging in three deep fields [Hubble Ultra Deep Field (HUDF), HUDF09-2 and Early Release Science] covering a total area of 45 square arcmin. By adopting a rigorous set of criteria for rejecting low-redshift int…
The causal connection between disc and power-law variability in hard state black hole X-ray binaries
Wilms, J.; Uttley, P.; Pottschmidt, K. +4 more
We use the XMM-Newton EPIC-pn instrument in timing mode to extend spectral time-lag studies of hard state black hole X-ray binaries into the soft X-ray band. We show that variations of the disc blackbody emission substantially lead variations in the power-law emission, by tenths of a second on variability time-scales of seconds or longer. The larg…
Dynamical masses of early-type galaxies: a comparison to lensing results and implications for the stellar initial mass function and the distribution of dark matter
Saglia, R. P.; Thomas, D.; Thomas, J. +6 more
This work aims to study the distribution of the luminous and dark matter in Coma early-type galaxies. Dynamical masses obtained under the assumption that mass follows light do not match with the masses of strong gravitational lens systems of similar velocity dispersions. Instead, dynamical fits with dark matter haloes are in good agreement with le…
Families of dynamically hot stellar systems over 10 orders of magnitude in mass
Hilker, M.; Misgeld, I.
Dynamically hot stellar systems, whether star clusters or early-type galaxies, follow well-defined scaling relations over many orders of magnitudes in mass. These Fundamental Plane relations have been subject of several studies, which have been mostly confined to certain types of galaxies and/or star clusters so far. Here, we present a complete pi…
The dependence of star formation activity on environment and stellar mass at z∼ 1 from the HiZELS-Hα survey
Smail, Ian; Sobral, David; Geach, James E. +4 more
This paper presents an environment and stellar mass study of a large sample of star-forming Hα emitters at z= 0.84 from the High-z Emission Line Survey (HiZELS), over 1.3 deg2 split over two fields (COSMOS and UKIDSS UDS). By taking advantage of a truly panoramic coverage of a wide range of environments, from the field to a rich cluster…
Dissecting the size evolution of elliptical galaxies since z∼ 1: puffing-up versus minor-merging scenarios
Trujillo, Ignacio; Ferreras, Ignacio; de La Rosa, Ignacio G.
At a fixed stellar mass, the size of low-redshift early-type galaxies is found to be a factor of 2 larger than that of their counterparts at z∼ 1, a result with important implications for galaxy formation models. In this paper, we have explored the buildup of the local mass-size relation of elliptical galaxies using two visually classified samples…
On the evolution of the velocity-mass-size relations of disc-dominated galaxies over the past 10 billion years
Koekemoer, Anton M.; Weiner, Benjamin J.; van den Bosch, Frank C. +10 more
We study the evolution of the scaling relations between the maximum circular velocity, stellar mass and optical half-light radius of star-forming disc-dominated galaxies in the context of Λ cold dark matter-based galaxy formation models. Using data from the literature combined with new data from the Deep Extragalactic Evolutionary Probe 2 (DEEP2) …
Anisotropy of Alfvénic turbulence in the solar wind and numerical simulations
Horbury, T. S.; Chen, C. H. K.; Mallet, A. +2 more
We investigate the anisotropy of Alfvénic turbulence in the inertial range of slow solar wind and in both driven and decaying reduced magnetohydrodynamic simulations. A direct comparison is made by measuring the anisotropic second-order structure functions in both data sets. In the solar wind, the perpendicular spectral index of the magnetic field…