Search Publications
The spectral energy distribution of the central parsecs of the nearest AGN
Meisenheimer, K.; Tristram, K. R. W.; Prieto, M. A. +4 more
Spectral energy distributions (SEDs) of the central few tens of parsec region of some of the nearest, most well-studied, active galactic nuclei (AGN) are presented. These genuine AGN-core SEDs, mostly from Seyfert galaxies, are characterized by two main features: an infrared (IR) bump with the maximum in the 2-10µm range and an increasing X-…
Cold dust and young starbursts: spectral energy distributions of Herschel SPIRE sources from the HerMES survey
Aussel, H.; Elbaz, D.; Valtchanov, I. +75 more
We present spectral energy distributions (SEDs) for 68 Herschel sources detected at 5σ at 250, 350 and 500 µm in the HerMES SWIRE-Lockman field. We explore whether existing models for starbursts, quiescent star-forming galaxies and active galactic nucleus dust tori are able to model the full range of SEDs measured with Herschel. We find that…
H2 reformation in post-shock regions
Kristensen, L. E.; Cuppen, H. M.; Gavardi, E.
H2 formation is an important process in post-shock regions, since H2 is an active participant in the cooling and shielding of the environment. The onset of H2 formation therefore has a strong effect on the temperature and chemical evolution in the post-shock regions. We recently developed a model for H2 …
Testing PDR models against ISO fine structure line data for extragalactic sources
Barlow, M. J.; Bell, T. A.; Viti, S. +2 more
Far-infrared [CII] 158-µm, [OI] 145-µm and [OI] 63-µm fine structure emission-line fluxes were measured from archival Infrared Space Observatory Long Wavelength Spectrometer spectra of 46 extragalactic sources, with 28 sources providing detections in all three lines. For 12 of the sources, the contribution to the [CII] 158-µ…
The spectral energy distribution of D-type symbiotic stars: the role of dust shells
Ciroi, S.; Rafanelli, P.; Angeloni, R. +1 more
We have collected continuum data of a sample of D-type symbiotic stars. By modelling their spectral energy distribution in a colliding-wind theoretical scenario we have found characteristics common to all the systems: (1) at least two dust shells are clearly present, one at ~1000K and the other at ~400K they dominate the emission in the infrared; …
Hyperluminous infrared galaxies from IIFSCz
Wang, Lingyu; Rowan-Robinson, Michael
We present a catalogue of 179 hyperluminous infrared galaxies (HLIRGs) from the Imperial IRAS-FSS Redshift (IIFSCz) Catalogue. Of the 92 with detections in at least two far-infrared bands, 62 are dominated by an M82-like starburst, 22 by an Arp 220-like starburst and eight by an active galactic nucleus (AGN) dust torus. On the basis of previous gr…
Infrared laboratory absorbance spectra of olivine: using classical dispersion analysis to extract peak parameters
Speck, A. K.; Dijkstra, C.; Pitman, K. M. +1 more
Laboratory measurements quantifying the effect of Fe substituting for Mg in olivine are needed to distinguish compositional from temperature, grain size and grain shape effects in observational data. To address this need, we study room temperature absorption spectra of a large suite of olivines evenly spaced across Mg and Fe compositions. We apply…
Mapping and spectroscopy of the planetary nebula NGC 7009 in the visual and infrared
Ramos-Larios, G.; Phillips, J. P.; Cuesta, L. C.
NGC 7009 is a fascinating example of a high-excitation, elliptical planetary nebula (PN) containing circumnebular rings, and FLIERs and jets along the major axis. We present visual spectroscopy along multiple position angles through the nucleus, taken with the Observatorio Astronomico Nacional (Mexico); mid-infrared (MIR) spectroscopy and imaging …
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…
Chemical and radiative transfer modelling of the ISO-LWS Fabry-Perot spectra of Orion-KL water lines
Barlow, M. J.; Swinyard, B. M.; Viti, S. +2 more
We present chemical and radiative transfer models for the many far-infrared ortho- and para-H2O lines that were observed from the Orion-KL region in high resolution Fabry-Pérot (FP) mode by the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The chemistry of the region was first studied by simulating th…