Search Publications
Weak lensing analysis of SZ-selected clusters of galaxies from the SPT and Planck surveys
Gruen, D.; Bender, R.; Seitz, S. +8 more
We present the weak lensing analysis of the Wide-Field Imager Sunyaev-Zel'dovich Cluster of Galaxy (WISCy) sample, a set of 12 clusters of galaxies selected for their Sunyaev-Zel'dovich (SZ) effect. After developing new and improved methods for background selection and determination of geometric lensing scaling factors from absolute multiband phot…
An X-ray survey of the 2 Jy sample - I. Is there an accretion mode dichotomy in radio-loud AGN?
Hardcastle, M. J.; Croston, J. H.; Morganti, R. +4 more
We carry out a systematic study of the X-ray emission from the active nuclei of the 0.02 < z < 0.7 2 Jy sample, using Chandra and XMM-Newton observations. We combine our results with those from mid-infrared, optical emission-line and radio observations, and add them to those of the 3CRR sources. We show that the low-excitation objects in our…
The dust budget crisis in high-redshift submillimetre galaxies
Aragón-Salamanca, A.; Dunne, L.; Dye, S. +5 more
We apply a chemical evolution model to investigate the sources and evolution of dust in a sample of 26 high-redshift (z > 1) submillimetre galaxies (SMGs) from the literature, with complete photometry from ultraviolet to the submillimetre. We show that dust produced only by low-intermediate-mass stars falls a factor 240 short of the observed du…
Verifying the mass-metallicity relation in damped Lyman α selected galaxies at 0.1 < z < 3.2
Fynbo, J. P. U.; Christensen, L.; Møller, P. +1 more
A scaling relation has recently been suggested to combine the galaxy mass-metallicity (MZ) relation with metallicities of damped Lyman α systems (DLAs) in quasar spectra. Based on this relation the stellar masses of the absorbing galaxies can be predicted. We test this prediction by measuring the stellar masses of 12 galaxies in confirmed DLA abso…
PACS photometry of the Herschel Reference Survey - far-infrared/submillimetre colours as tracers of dust properties in nearby galaxies
Ciesla, L.; Buat, V.; Boquien, M. +26 more
We present Herschel/PACS 100 and 160 µm integrated photometry for the 323 galaxies in the Herschel Reference Survey (HRS), a K-band, volume-limited sample of galaxies in the local Universe. Once combined with the Herschel/SPIRE observations already available, these data make the HRS the largest representative sample of nearby galaxies with h…
The evolution of dust-obscured star formation activity in galaxy clusters relative to the field over the last 9 billion years
Weiner, Benjamin J.; Moustakas, John; Dey, Arjun +14 more
We compare the star formation (SF) activity in cluster galaxies to the field from z = 0.3 to 1.5 using Herschel Spectral and Photometric Imaging REceiver 250 µm imaging and utilizing 274 clusters from the IRAC Shallow Cluster Survey (ISCS). These clusters were selected as rest-frame near-infrared overdensities over the 9 square degree Boötes…
A volume-limited sample of X-ray galaxy groups and clusters - I. Radial entropy and cooling time profiles
Fabian, A. C.; Sanders, J. S.; Panagoulia, E. K.
We present the first results of our study of a sample of 101 X-ray galaxy groups and clusters, which is volume-limited in each of three X-ray luminosity bins. The aim of this work is to study the properties of the innermost ICM in the cores of our groups and clusters, and to determine the effect of non-gravitational processes, such as active galac…
The mass-metallicity-star formation rate relation at z ≳ 2 with 3D Hubble Space Telescope
Bowler, R. A. A.; Cullen, F.; McLure, R. J. +2 more
We present new accurate measurements of the mass, metallicity and star-formation rate of a statistically significant sample of 93 galaxies at z ≳ 2 using near-infrared spectroscopy taken as part of the 3D-Hubble Space Telescope survey. We derive a mass-metallicity relation (MZR) for our sample with metallicities based on the oxygen and Hβ nebular …
zCOSMOS 20k: satellite galaxies are the main drivers of environmental effects in the galaxy population at least to z ∼ 0.7
Kneib, J. -P.; Aussel, H.; Le Floc'h, E. +41 more
We explore the role of environment in the evolution of galaxies over 0.1 < z < 0.7 using the final zCOSMOS-bright data set. Using the red fraction of galaxies as a proxy for the quenched population, we find that the fraction of red galaxies increases with the environmental overdensity δ and with the stellar mass M*, consistent wit…
On the determination of the spin and disc truncation of accreting black holes using X-ray reflection
Fabian, A. C.; Miller, J. M.; Reynolds, C. S. +4 more
We discuss the application of simple relativistically blurred X-ray reflection models to the determination of the spin and the inner radius of the disc in accreting black holes. Observationally, the nature of the corona is uncertain a priori, but a robust determination of the inner disc radius can be made when the disc emissivity index is tightly …