Search Publications
The chemical diversity of exo-terrestrial planetary debris around white dwarfs
Gänsicke, B. T.; Breedt, E.; Koester, D. +3 more
We present Hubble Space Telescope (HST) ultraviolet spectroscopy of the white dwarfs PG 0843+516, PG 1015+161, SDSS 1228+1040, and GALEX 1931+0117, which accrete circumstellar planetary debris formed from the destruction of asteroids. Combined with optical data, a minimum of five and a maximum of 11 different metals are detected in their photosphe…
Updating quasar bolometric luminosity corrections
Shang, Zhaohui; Brotherton, Michael S.; Runnoe, Jessie C.
Bolometric corrections are used in quasar studies to quantify total energy output based on a measurement of a monochromatic luminosity. First, we enumerate and discuss the practical difficulties of determining such corrections, then we present bolometric luminosities between 1 µm and 8 keV rest frame and corrections derived from the detailed…
A Gaussian process framework for modelling instrumental systematics: application to transmission spectroscopy
Aigrain, S.; Pont, F.; Gibson, N. P. +3 more
Transmission spectroscopy, which consists of measuring the wavelength-dependent absorption of starlight by a planet's atmosphere during a transit, is a powerful probe of atmospheric composition. However, the expected signal is typically orders of magnitude smaller than instrumental systematics and the results are crucially dependent on the treatme…
GOODS-Herschel: the far-infrared view of star formation in active galactic nucleus host galaxies since z ≈ 3
Magnelli, B.; Lutz, D.; Altieri, B. +28 more
We present a study of the infrared properties of X-ray selected, moderate-luminosity (i.e. LX= 1042-1044 erg s-1) active galactic nuclei (AGNs) up to z ≈ 3, in order to explore the links between star formation in galaxies and accretion on to their central black holes. We use 100 and 160 µ m fluxes …
On the correlations between galaxy properties and supermassive black hole mass
Beifiori, A.; Corsini, E. M.; Zhu, Y. +1 more
We use a large sample of upper limits and accurate estimates of supermassive black hole (SMBH) masses coupled with libraries of host galaxy velocity dispersions, rotational velocities and photometric parameters extracted from Sloan Digital Sky Survey i-band images to establish correlations between the SMBH and host galaxy parameters. We test wheth…
X-ray-optical classification of cluster mergers and the evolution of the cluster merger fraction
Mann, Andrew W.; Ebeling, Harald
We present the results of a simple but robust morphological classification of a statistically complete sample of 108 of the most X-ray-luminous clusters at 0.15 ≤z≤ 0.7 observed with Chandra. Our aims are to (a) identify the most disturbed massive clusters to be used as gravitational lenses for studies of the distant Universe and as probes of part…
Energetic galaxy-wide outflows in high-redshift ultraluminous infrared galaxies hosting AGN activity
Ivison, R. J.; Smail, Ian; Alexander, D. M. +10 more
We present integral field spectroscopy observations, covering the [O III] λλ4959, 5007 emission-line doublet of eight high-redshift (z = 1.4-3.4) ultraluminous infrared galaxies (ULIRGs) that host active galactic nucleus (AGN) activity, including known submillimetre luminous galaxies. The targets have moderate radio luminosities that are typical o…
The DEEP3 Galaxy Redshift Survey: the impact of environment on the size evolution of massive early-type galaxies at intermediate redshift
Weiner, Benjamin J.; Davis, Marc; Faber, S. M. +10 more
Using data drawn from the DEEP2 and DEEP3 Galaxy Redshift Surveys, we investigate the relationship between the environment and the structure of galaxies residing on the red sequence at intermediate redshift. Within the massive (10 < log10(M★/h-2 M⊙) < 11) early-type population at 0.4 < z < 1.…
GALAPAGOS: from pixels to parameters
Barden, Marco; Peng, Chien Y.; McIntosh, Daniel H. +2 more
To automate source detection, two-dimensional light profile Sérsic modelling and catalogue compilation in large survey applications, we introduce a new code Galaxy Analysis over Large Areas: Parameter Assessment by GALFITting Objects from SEXTRACTOR (GALAPAGOS). Based on a single set-up, GALAPAGOS can process a complete set of survey images. It de…
The properties of the star-forming interstellar medium at z = 0.84-2.23 from HiZELS: mapping the internal dynamics and metallicity gradients in high-redshift disc galaxies
Smail, Ian; Swinbank, A. M.; Geach, J. E. +5 more
We present adaptive optics assisted, spatially resolved spectroscopy of a sample of nine Hα-selected galaxies at z = 0.84-2.23 drawn from the HiZELS narrow-band survey. These galaxies have star formation rates of 1-27 M⊙ yr-1 and are therefore representative of the typical high-redshift star-forming population. Our ∼kpc-scale…