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Evidence for an outflow from the Seyfert galaxy NGC 4051
Steffen, W.; Mundell, C. G.; Meaburn, J. +5 more
New observations using narrow-band imaging, long-slit spectroscopy and MERLIN observations of the nuclear region of the Seyfert galaxy NGC 4051 have been made. An edge-brightened, triangular region of ionized gas extending 420 pc from the centre of the galaxy has been detected. Long-slit spectra of this ionized gas, taken at 1.5 arcsec from the co…
GX17+2: X-ray spectral and timing behaviour of a bursting Z source
van Paradijs, J.; van der Klis, M.; Lewin, W. H. G. +2 more
We have investigated the properties of the Z pattern of the low-mass X-ray binary GX17+2 in the X-ray colour-colour diagrams (CDs) and hardness-intensity diagrams (HIDs), and of the power spectra as a function of position in the Z. We used all EXOSAT ME data on GX17+2, a total of six observations during 1983-86. We find that the Z pattern in the C…
HST observations of the field star population in the Large Magellanic Cloud
Elson, Rebecca A. W.; Gilmore, Gerard F.; Santiago, Basilio X.
We present V and I photometry, obtained with the Hubble Space Telescope, for ~15 800 stars in a field in the inner disc of the Large Magellanic Cloud. We confirm previous results indicating that an intense star formation event, probably corresponding to the formation of the LMC disc, occurred a few times 10^9 yr ago. We find a small but real diffe…
The WC10 central stars CPD-56 deg8032 and He 2-113 - I. Distances and nebular parameters
Barlow, M. J.; De Marco, Orsola; Storey, P. J.
We present the results of an analysis of the WC10 central stars CPD-56 deg8032 and He 2-113 and of their surrounding planetary nebulae (PNe). UCL Echelle Spectrograph spectra with a resolving power of R=50 000, covering the wavelength range 3600-9500 A, were obtained for both objects. Expansion and radial velocities are derived from the nebular Ba…
An ISO Long Wavelength Spectrometer detection of CH in NGC 7027 and an HeH^+ upper limit
Barlow, M. J.; Cernicharo, J.; Liu, X. -W. +10 more
We have detected an emission line at 149.18+/-0.06 µm in the ISO Long Wavelength Spectrometer (LWS) grating spectrum of the planetary nebula NGC 7027. This line coincides in wavelength with both the HeH^+ J=1-0 fundamental pure rotational line at 149.14 µm and the CH ^2Pi_3/2 (F_2) J=3/2-^2Pi_1/2 (F_2) J=1/2 fundamental pure rotational…
Observations of the Hubble Deep Field with the Infrared Space Observatory - I. Data reduction, maps and sky coverage
Elbaz, D.; Danese, L.; Franceschini, A. +16 more
We present deep imaging at 6.7 and 15 mu from the CAM instrument on the Infrared Space Observatory (ISO), centred on the Hubble Deep Field (HDF). These are the deepest integrations published to date at these wavelengths in any region of sky. We discuss the observational strategy and the data reduction. The observed source density appears to approa…
A jet-cloud interaction in 3C 34 at redshift z=0.69
Best, P. N.; Rottgering, H. J. A.; Longair, M. S.
We report the detection of a strong jet-cloud interaction at a distance of 120 kpc from the nucleus of the radio galaxy 3C 34, which has redshift z=0.69. Hubble Space Telescope images of the radio galaxy show a long narrow region of blue emission orientated along the radio axis and directed towards a radio hotspot. The William Herschel Telescope h…
Elemental abundances for Nova V693 Coronae Austrinae 1981
Shore, Steven N.; Starrfield, Sumner; Vanlandingham, Karen M.
We present an analysis of the UV spectra of the fast ONeMg nova V693 Coronae Austrinae 1981. Observations with IUE began on 1981 April 10 and continued until 1981 November 14. We find the reddening for the nova to be E(B-V)~=0.2+/-0.1. Using the photoionization code cloudy90.02 and the minimization routine minuit, we derive elemental abundances fo…
Observations of the Hubble Deep Field with the Infrared Space Observatory - IV. Association of sources with Hubble Deep Field galaxies
Elbaz, D.; Danese, L.; Franceschini, A. +17 more
We discuss the identification of sources detected by the Infrared Space Observatory (ISO) at 6.7 and 15 µ in the Hubble Deep Field (HDF) region. We conservatively associate ISO sources with objects in existing optical and near-infrared HDF catalogues using the likelihood ratio method, confirming these results (and, in one case, clarifying th…
A search for hidden white dwarfs in the ROSAT extreme ultraviolet survey
Barstow, M. A.; Burleigh, M. R.; Fleming, T. A.
The ROSAT Wide Field Camera survey has provided us with evidence for the existence of a previously unidentified sample of hot white dwarfs (WDs) in non- interacting binary systems, through the detection of extreme ultraviolet (EUV) and soft X-ray emission. These stars are hidden at optical wavelengths because of their close proximity to much more …