Search Publications
Mid-infrared diagnostics of metal-rich HII regions from VLT and Spitzer spectroscopy of young massive stars in W31
Crowther, P. A.; Morris, P. W.; Conti, P. S. +4 more
We present near-infrared Very Large Telescope/Infrared Spectrograph and Array Camera and mid-infrared (mid-IR) Spitzer/Infrared Spectrograph spectroscopy of the young massive cluster in the W31 star-forming region. H-band spectroscopy provides refined classifications for four cluster member O stars with respect to Blum et al. In addition, photosph…
The association between gas and galaxies - III. The cross-correlation of galaxies and Lyα absorbers† at z ~ 1
Morris, Simon L.; Shone, Allen M.; Crighton, Neil +1 more
We have measured the two-dimensional two-point correlation function, ξAG, between low-column-density Lyα absorbers and galaxies at a redshift z ~ 1. We measured Lyα absorbers between redshifts z = 0.68 and 1.51 over a total redshift path length of Δz = 1.08 from Hubble Space Telescope Space Telescope Imaging Spectrograph E230M absorptio…
The origin of the X-ray-emitting plasma in the eastern edge of the Cygnus Loop
Miceli, Marco; Orlando, Salvatore; Bocchino, Fabrizio +2 more
The Cygnus Loop is interacting with a protrusion of the cavity wall in its eastern edge (the XA region), where the X-ray emission is very bright. The complexity of the environment and the non-linear physical processes of the shock-cloud interaction make the origin of the X-ray emission still not well understood. Our purpose is to understand the ph…
Modelling Herschel observations of infrared-dark clouds in the Hi-GAL survey
Griffin, M. J.; Ward-Thompson, D.; Molinari, S. +5 more
We demonstrate the use of the 3D Monte Carlo radiative transfer code PHAETHON to model infrared-dark clouds (IRDCs) that are externally illuminated by the interstellar radiation field (ISRF). These clouds are believed to be the earliest observed phase of high-mass star formation, and may be the high-mass equivalent of lower mass pre-stellar cores.…
Evolution of the X-ray profiles of poor clusters from the XMM-LSS survey
Pierre, Marguerite; Pacaud, Florian; Ponman, Trevor +1 more
A sample consisting of 27 X-ray-selected galaxy clusters from the X-ray Multi-Mirror Large-Scale Structure (XMM-LSS) survey is used to study the evolution in the X-ray surface brightness profiles of the hot intracluster plasma. These systems are mostly groups and poor clusters, with temperatures 0.6-4.8keV, spanning the redshift range 0.05 to 1.05…
The Deep SPIRE HerMES Survey: spectral energy distributions and their astrophysical indications at high redshift
Altieri, B.; Aussel, H.; Elbaz, D. +70 more
The Spectral and Photometric Imaging Receiver on-board Herschel has been carrying out deep extragalactic surveys, one of the aims of which is to establish spectral energy distributions of individual galaxies spanning the infrared/submillimetre (IR/SMM) wavelength region. We report observations of the IR/SMM emission from the Lockman North field an…
The Type Ib supernova 2010O: an explosion in a Wolf-Rayet X-ray binary?
Nelemans, Gijs; Voss, Rasmus; Nielsen, Mikkel T. B. +1 more
The Type Ib supernova 2010O was recently discovered in the interacting starburst galaxy Arp 299. We present an analysis of two archival Chandra X-ray observations of Arp 299 taken before the explosion and show that there is a transient X-ray source at a position consistent with the supernova. Due to the diffuse emission, the background is difficul…
When galaxies collide: understanding the broad absorption-line radio galaxy 4C +72.26
Jarvis, M. J.; Swinbank, A. M.; Rawlings, S. +2 more
We present a range of new observations of the `broad absorption-line radio galaxy' 4C +72.26 (z ~ 3.5), including sensitive rest-frame ultraviolet integral field spectroscopy using the Gemini/GMOS-N instrument and Subaru/CISCO K-band imaging and spectroscopy. We show that 4C +72.26 is a system of two vigorously star-forming galaxies superimposed a…
Quantifying the importance of ram-pressure stripping in a galaxy group at 100 Mpc
Croston, J. H.; Freeland, E.; Sengupta, C.
We examine two members of the NGC 4065 group of galaxies: a bent-double (aka wide angle tail) radio source and an H I-deficient spiral galaxy. Models of the X-ray-emitting intragroup gas and the bent-double radio source, NGC 4061, are used to probe the density of intergalactic gas in this group. H I observations reveal an asymmetric, truncated dis…
Quasar radio-loudness and the elliptical core problem
Hamilton, Timothy S.
The dichotomy between radio-loud and radio-quiet quasi-stellar objects (QSOs) is not simply one of host morphology. While spiral galaxies almost exclusively host radio-quiet QSOs, ellipticals can host either radio-louds or radio-quiets. We find that a combination of accretion rate and host scale determines which type of QSO a given elliptical gala…