Search Publications
The connection between radio loudness and central surface brightness profiles in optically selected low-luminosity active galaxies
Uttley, P.; Körding, E.; Richings, A. J.
Recent results indicate a correlation between nuclear radio loudness of active galaxies and their central stellar surface-brightness profiles, in that 'core' galaxies (with inner logarithmic slope γ≤ 0.3) are significantly more radio loud than 'power-law' galaxies (γ≥ 0.5). This connection, which indicates possible links between radio loudness and…
On the co-evolution of supermassive black holes and their host galaxies since z= 3
Conselice, Christopher J.; Nandra, Kirpal; Bluck, Asa F. L. +3 more
To investigate the evolution in the relation between galaxy stellar and central black hole mass, we identify a population of 508 X-ray-selected active galactic nuclei (AGN) at 0.4 < z < 6 residing within host galaxies with stellar masses in the range 1010 M⊙ < M* < 1012 M⊙. From th…
The HST/ACS Coma Cluster Survey - VI. Colour gradients in giant and dwarf early-type galaxies
Jogee, S.; Ferguson, H. C.; Peletier, R. F. +17 more
Using deep, high-spatial-resolution imaging from the Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) Coma Cluster Treasury Survey, we determine colour profiles of early-type galaxies in the Coma cluster. From 176 galaxies brighter than MF814W(AB)=-15 mag that are either spectroscopically confirmed members of Coma or identif…
The microjansky and nanojansky radio sky: source population and multiwavelength properties
Padovani, Paolo
I present simple but robust estimates of the types of sources making up the faint, sub-microjansky radio sky. These include, not surprisingly, star-forming galaxies and radio-quiet active galactic nuclei but also two 'new' populations, i.e. low radio power ellipticals and dwarf galaxies, the latter likely constituting the most numerous component o…
The Planck-ATCA Co-eval Observations project: the bright sample
Bonaldi, Anna; de Zotti, Gianfranco; Massardi, Marcella +3 more
The Planck Australia Telescope Compact Array (Planck-ATCA) Co-eval Observations (PACO) have provided flux density measurements of well-defined samples of Australia Telescope 20 GHz (AT20G) radio sources at frequencies below and overlapping with Planck frequency bands, almost simultaneously with Planck observations. We have observed with the ATCA a…
Three-dimensional chemically homogeneous and bi-abundance photoionization models of the `super-metal-rich' planetary nebula NGC 6153
Yuan, H. -B.; Zhang, Y.; Liu, X. -W. +3 more
Deep spectroscopy of the planetary nebula NGC 6153 shows that its heavy element abundances derived from optical recombination lines (ORLs) are 10 times higher than those derived from collisionally excited lines (CELs), and points to the existence of H-deficient inclusions embedded in the diffuse nebula. In this study, we have constructed chemicall…
HerMES: detection of cosmic magnification of submillimetre galaxies using angular cross-correlation
Pérez-Fournon, I.; Rodighiero, G.; Ivison, R. J. +37 more
Cosmic magnification is due to the weak gravitational lensing of sources in the distant Universe by foreground large-scale structure leading to coherent changes in the observed number density of the background sources. Depending on the slope of the background source number counts, cosmic magnification causes a correlation between the background an…
Chemical abundances in the protoplanetary disc LV 2 (Orion): clues to the causes of the abundance anomaly in H II regions
Tsamis, Y. G.; Walsh, J. R.; Vílchez, J. M. +1 more
Optical integral field spectroscopy of the archetype protoplanetary disc LV 2 in the Orion nebula is presented, taken with the Very Large Telescope (VLT) FLAMES/Argus fibre array. The detection of recombination lines (RLs) of C II and O II from this class of objects is reported, and the lines are utilized as abundance diagnostics. The study is com…
A deep Chandra observation of the poor cluster AWM 4 - II. The role of the radio jets in enriching the intracluster medium
Raychaudhury, Somak; Giacintucci, Simona; Vrtilek, Jan M. +2 more
We use a Chandra observation of the poor cluster AWM 4 to map the temperature and abundance of the intracluster medium, so as to examine the influence of the central radio galaxy on its environment. While the cluster core is generally enriched to near-solar abundances, we find evidence of supersolar abundances correlated with the radio jets, exten…
Multiwavelength modelling of the β Leo debris disc: one, two or three planetesimal populations?
Duchêne, G.; Wyatt, M. C.; Greaves, J. +7 more
In this paper we present a model of the β Leo debris disc, with an emphasis on modelling the resolved Photodetector Array Camera and Spectrometer (PACS) images obtained as a part of the Herschel key programme DEBRIS. We also present new Spectral and Photometric Imaging REceiver (SPIRE) images of the disc at 250 µm, as well as new constraints…