Search Publications
Observations of hyperluminous infrared galaxies with the Infrared Space Observatory: implications for the origin of their extreme luminosities
McMahon, Richard; Verma, Aprajita; Rowan-Robinson, Michael +1 more
We present 7-180 µm photometry of a sample of hyperluminous infrared galaxies (HyLIGs) obtained with the photometer and camera mounted on the Infrared Space Observatory. We have used radiative transfer models of obscured starbursts and dusty torii to model their spectral energy distributions (SEDs). We find that IRAS F00235+1024, IRAS F14218…
The effect of lensing on the identification of SCUBA galaxies
Ivison, R. J.; Smail, Ian; Blain, A. W. +1 more
Spectroscopic surveys of submillimetre(submm)-selected sources have uncovered optically bright galaxies at z<~ 1 close to the positions of several submm sources. Naive statistical analyses suggest that these galaxies are associated with the submm emission. However, in some cases, it is difficult to understand this association given the relative…
Temperature variations from Hubble Space Telescope imagery and spectroscopy of NGC 7009
Martin, P. G.; Harrington, J. P.; Balick, B. +8 more
We present new Hubble Space Telescope (HST)/WFPC2 imagery and STIS long-slit spectroscopy of the planetary nebula NGC 7009. The primary goal was to obtain high spatial resolution of the intrinsic line ratio [OIII] 4364/5008 and thereby evaluate the electron temperature (Te) and the fractional mean-square Te variation (tA…
Testing the line-driven disc wind model: time-resolved ultraviolet spectroscopy of IX Vel and V3885Sgr
Knigge, C.; Long, K. S.; Proga, D. +2 more
To confront the predictions of the most recent line-driven disc wind models with observational evidence, we have obtained Hubble Space Telescope (HST ) STIS (1180-1700Å) echelle spectra of the nova-like variables IX Vel and V3885Sgr at three epochs. The targets were observed in time-tag mode for ~2000s on each occasion, allowing us to study the sp…
Giant low surface brightness haloes in distant radio galaxies: USS0828+193
Pentericci, L.; Humphrey, A.; Villar-Martín, M. +5 more
We present results on the spectroscopic study of the ionized gas in the high-redshift radio galaxy USS0828+193 at z= 2.57. Thanks to the high signal-to-noise (S/N) ratio of the emission lines in the Keck spectrum, we have been able to perform a detailed kinematic study by means of the spectral decomposition of the emission line profiles. This stud…
Observations of the Hubble Deep Field South with the Infrared Space Observatory - II. Associations and star formation rates
Oliver, Seb; Elbaz, David; Franceschini, Alberto +15 more
We present results from a deep mid-infrared survey of the Hubble Deep Field South (HDF-S) region performed at 6.7 and 15µm with the ISOCAM instrument on board the Infrared Space Observatory (ISO ). We find reliable optical/near-infrared associations for 32 of the 35 sources detected in this field by Oliver et al. (Paper I): eight of them are…
An XMM-Newton observation of Ton S180: constraints on the continuum emission in ultrasoft Seyfert galaxies
Brandt, W. N.; Vaughan, S.; Fabian, A. C. +3 more
We present an XMM-Newton observation of the bright, narrow-line, ultrasoft type 1 Seyfert galaxy Ton S180. The 0.3-10 keV X-ray spectrum is steep and curved, showing a steep slope above 2.5 keV (Γ~ 2.3) and a smooth, featureless excess of emission at lower energies. The spectrum can be adequately parametrized using a simple double power-law model.…
Hubble Space Telescope Wide Field Planetary Camera 2 observations of hyperluminous infrared galaxies
Farrah, D.; Verma, A.; Rowan-Robinson, M. +2 more
We present Hubble Space Telescope Wide Field Planetary Camera 2 I-band imaging for a sample of nine hyperluminous infrared galaxies (HLIRGs) spanning a redshift range 0.45<z<1.34. Three of the sample have morphologies showing evidence for interactions and six are quasi-stellar objects (QSOs). Host galaxies in the QSOs are detected reliably o…
Clues about the star formation history of the M31 disc from WFPC2 photometry
Williams, Benjamin F.
Over the past several years, the Hubble Space Telescope (HST) has acquired many broad-band images of various regions in the M31 disc. I have obtained 27 such fields from the HST data archive in order to produce colour-magnitude diagrams (CMDs) of the stellar populations contained within these areas of the disc. I have attempted to reproduce these …
2016+112: a gravitationally lensed type II quasar
Lawrence, C. R.; Blandford, R. D.; Koopmans, L. V. E. +3 more
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A single-screen model of the gravitational lens system 2016+112 is proposed, that explains recent Hubble Space Telescope (HST) infrared (NICMOS-F160W) observations and new high-resolution European VLBI Network (EVN) 5-GHz radio observations, presented in this paper. In particular, we find that a massive `dark' structure at the lens posit…