Search Publications
Overpressured emission-line clouds in the haloes of powerful radio galaxies
Tadhunter, C. N.; Robinson, T. G.; Dyson, J. E.
We present accurate measurements of the physical conditions in five powerful radio galaxies, as derived from deep, long-slit spectroscopic observations. All five objects show prominent extended line emission, and have X-ray luminosities similar to those of isolated elliptical galaxies. The data are high enough quality that the electron density and…
The origin of [FeII] emission in NGC4151
Chapman, Scott; Lee, David; Turner, James E. H. +5 more
The centre of NGC4151 has been observed in the J band with the SMIRFS integral field unit (IFU) on the UK Infrared Telescope. A map of [FeII] emission is derived, and compared with the distributions of the optical narrow-line region and radio jet. We conclude that, because the [FeII] emission is associated more closely with the visible narrow-line…
Time-resolved ultraviolet spectroscopy of the compact interacting binary QU Car
Long, K. S.; Drew, J. E.; Hartley, L. E.
We present Hubble Space Telescope STIS (1160-1700 Å) echelle spectra of the cataclysmic variable (CV) star QU Car, at three epochs. In catalogues this binary is classified as a nova-like variable. QU Car was observed three times in time-tag mode for 2300, 2600 and 2600 s, allowing us to study the spectral time evolution on time-scales down to ~10 …
Do red giant stars pulsate in high overtones?
Percy, John R.; Hosick, JoAnne
About 30 photometrically variable red giant stars have periods less than 10d, as determined by the compilers of the Hipparcos Catalogue from Hipparcos photometric measurements. These periods, when combined with estimates of the radii and masses of these stars, and with pulsation theory, imply that these stars are pulsating in very high overtones. …
A radio continuum study of the `Engraved Hourglass' nebula, MyCn 18
Bryce, M.; Bains, I.; Calabretta, M. +1 more
We present the first radio continuum images of the `Engraved Hourglass' planetary nebula (PN) MyCn 18 from multifrequency observations with the Australia Telescope. The radio emission is strongly core-dominated at all frequencies investigated. At the three higher observing frequencies, the radio emission is seen to trace the optically-visible hour…
Two jets from the Orion nebula (M42) `proplyds': kinematics, morphologies and origins
Redman, M. P.; Meaburn, J.; Graham, M. F.
A spatially unresolved velocity feature, with an approaching radial velocity of ~100 km s-1 with respect to the systemic radial velocity, in a position-velocity array of [OIII] 5007-Å line profiles is identified as the kinematical counterpart of a jet from the proplyd LV 5 (158-323) in the core of the Orion nebula. The only candidate in…
Identification of a strong emission line at 2.8935 µm in the spectrum of the Orion Nebula
Lucy, L. B.
A strong emission line at 2.8935µm discovered by Rubin et al. in an ISO SWS02 spectrum of the Orion Nebula is identified as the 4p3P-4s3So multiplet of OI. Line formation is due to de-excitation cascades following UV-pumping of high 3So and 3Do terms and occurs in t…
Hidden subluminous stars among the FAUST UV sources towards Ophiuchus
Bowyer, Stuart; Brosch, Noah; Almoznino, Elchanan +2 more
We present results of an analysis of a UV image in the direction of Ophiuchus, obtained with the FAUST instrument. The image contains 228 UV sources. Most of these are identified as normal early-type stars through correlations with catalogued objects. For the first time in this project we identify UV sources as such stars by selecting suitable can…
The morphology of nine radio-selected faint galaxies from deep Hubble Space Telescope imaging
Koo, David C.; Roche, Nathan D.; Lowenthal, James D.
Using the Hubble Space Telescope (HST) WFPC2 we perform deep I-band imaging of nine radio-selected [F(8.5 GHz) >=14 µJy] faint galaxies from the Roche, Lowenthal & Koo (2002) sample. Two are also observed in V using HST STIS. Six of the galaxies have known redshifts, in the range 0.4 < z < 1.0. Radial intensity profiles indicate…
A search for circumstellar material around B-type stars in the Galactic halo
Dufton, P. L.; Keenan, F. P.; Rolleston, W. R. J. +2 more
19 B-type stars, selected from the Palomar-Green Survey, have been observed at infrared wavelengths to search for possible infrared excesses, as part of an ongoing programme to investigate the nature of early-type stars at high Galactic latitudes. The resulting infrared fluxes, along with Strömgren photometry, are compared with theoretical flux pr…