Search Publications
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 …
Is there really a supermassive black hole in M87?
Marconi, A.; Macchetto, F. D.; Capetti, A. +3 more
We present the first HST long-slit spectrum of a gaseous disc around a candidate supermassive black hole. The results of this study on the kinematics of the gaseous disc in M87 are a considerable improvement in both spatial resolution and accuracy over previous observations, and require a projected mass of MBH(sin i)2 = (2.0±…
Analytical dynamical models for double power-law galactic nuclei
Zhao, Hongsheng
Motivated by the finding that the observed surface brightness profiles of many galactic nuclei are fitted well by double power laws, we explore a range of spherical self-consistent dynamical models with this light profile. We find that the corresponding deprojected volume density profile, phase- space density and line-of-sight velocity distributio…
A photometric and spectroscopic study of the symbiotic binary BFCyg
Bode, M. F.; Errico, L.; Vittone, A. +3 more
We present the historical 1890-1996 photographic/B-band light curve of the symbiotic binary BF Cyg for the first time. It displays three types of eruption: (i) a slow, symbiotic nova outburst (1895-1960), probably caused by a thermonuclear event; (ii) short-term flares dependent on the orbital phase, possibly triggered by accretion events, and (ii…