Search Publications
Star-forming accretion flows and the low-luminosity nuclei of giant elliptical galaxies
Tan, Jonathan C.; Blackman, Eric G.
The luminosities of the centres of nearby elliptical galaxies are very low compared to models of thin disc accretion on to their black holes at the Bondi rate, typically a few hundredths to a few tenths of a solar mass per year. This has motivated models of inefficiently radiated accretion that invoke weak electron-ion thermal coupling, and/or inh…
Mid-infrared imaging of NGC 1068 with VISIR at the Very Large Telescope
Pantin, E.; Alloin, D.; Galliano, E. +1 more
High-resolution mid-infrared (MIR) images of the central region of NGC 1068 have been obtained with VISIR, the multi-mode MIR instrument recently installed at the European Southern Observatory Very Large Telescope on Paranal. A map of the emission at 12.8 µm with increased sensitivity over the central 8 × 8 arcsec2 area is discuss…
On the evolutionary status of early-type galaxies in clusters at z~ 0.2 - I. The Fundamental Plane
Smail, Ian; Davies, Roger L.; Bower, Richard G. +2 more
We investigate a spectroscopic sample of 48 early-type galaxies in the rich cluster Abell 2390 at z= 0.23 and 48 early-type galaxies from a previously published survey of Abell 2218 at z= 0.18. The spectroscopic data of A2390 are based on multi-object spectroscopy using the multi-object spectrograph for Calar Alto at the 3.5-m telescope on Calar A…
A study of two post-common envelope binary systems
Maxted, P. F. L.; Exter, K. M.; Napiwotzki, R. +2 more
We present intermediate-resolution, phase-resolved spectra of the close-binary systems EC 11575-1845 and V664 Cas, the central star of the planetary nebula HFG 1. Both systems have a very rich emission-line spectrum originating from the face of the cool star, which is irradiated by the hot subdwarf star. The HI emission lines are wide, consistent …
An X-ray emission-line spectrum of Nova V382Velorum 1999
Schmitt, J. H. M. M.; Ness, J. -U.; Jordan, C. +2 more
We report on the analysis of an X-ray grating spectrum of the Classical Nova V382Vel (1999), obtained with the Low Energy Transmission Grating (LETG)+HRC-S instrument onboard Chandra, which shows emission lines dominating over any continuum. Lines of Si, Mg, Ne, O, N and C are identified, but no Fe lines are detected. The total luminosity in the l…
X-ray observations of the edge-on star-forming galaxy NGC 891 and its supernova SN1986J
Stevens, Ian R.; Raychaudhury, Somak; Temple, Rowan F.
We present XMM-Newton observations of NGC 891, a nearby edge-on spiral galaxy. We analyse the extent of the diffuse emission emitted from the disc of the galaxy, and find that it has a single-temperature profile with best-fitting temperature of 0.26 keV, though the fit of a dual-temperature plasma with temperatures of 0.08 and 0.30 keV is also acc…
The connection between ultraviolet and X-ray outflows in active galactic nuclei: the case of PDS 456
Simpson, Chris; O'Brien, Paul T.; Reeves, James N. +1 more
High-velocity outflows from active galactic nuclei are a well-known phenomenon in terms of the broad absorption lines seen in the ultraviolet/optical. More recently, similar, possibly related, outflows have been reported in the X-ray. The most extreme example is seen in the nearby, luminous QSO PDS 456, which displays a massive, high-velocity (500…
Spatially resolved spectroscopy of the E+A galaxies in the z= 0.32 cluster AC 114
Kuntschner, Harald; Bekki, Kenji; Colless, Matthew +5 more
We present spatially resolved intermediate-resolution spectroscopy of a sample of 12 E+A galaxies in the z= 0.32 rich galaxy cluster AC 114, obtained with the FLAMES multi-integral field unit system on the Very Large Telescope (VLT) of the European Southern Observatory. Previous integrated spectroscopy of all these galaxies by Couch & Sharples…
A Chandra observation of the X-ray environment and jet of 3C 296
Hardcastle, M. J.; Birkinshaw, M.; Worrall, D. M. +2 more
We have observed the twin-jet radio galaxy 3C 296 with Chandra. X-ray emission is detected from the nucleus, from the inner parts of the radio jet and from a small-scale thermal environment around the jet deceleration region. As we have found in previous observations of other twin-jet radio galaxies, the X-ray jet and a steep pressure gradient in …
Submillimetre detection of a high-redshift type 2 QSO
Dunlop, J. S.; Rigopoulou, D.; Tozzi, P. +6 more
We report on the first SCUBA detection of a type 2 QSO at z= 3.660 in the Chandra Deep Field South. This source is X-ray-absorbed, shows only narrow emission lines in the optical spectrum and is detected in the submillimetre: it is the ideal candidate in an evolution scheme for active galactic nuclei (AGN) (e.g. Fabian 1999; Page et al. 2004) of a…