Search Publications
HST, radio and infrared observations of 28 3CR radio galaxies at redshift z~ - I. The observations
Best, P. N.; Longair, M. S.; Roettgering, H. J. A.
Hubble Space Telescope images are presented of a sample of 28 3CR radio galaxies with redshifts in the range 0.6<z<1.8, together with maps at comparable angular resolution of their radio structure, taken using the Very Large Array. Infrared images of the fields, taken with the United Kingdom InfraRed Telescope, are also presented. The optica…
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…
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…
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…
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…
Red giants in the halo of the S0 galaxy NGC 3115: a distance and a bimodal metallicity distribution
Elson, Rebecca A. W.
Using the Hubble Space Telescope, we resolve the red giant branch in the halo of the S0 galaxy NGC 3115. We measure magnitudes and (V-I) colours for stars down to 1.5mag below the tip of the red giant branch. From the brightest stars we estimate a distance modulus (m-M)_0=30.21+/-0.30, corresponding to a distance of 11.0+/-1.5Mpc. This is in excel…
The luminosity function of the globular cluster NGC 6752 with the Hubble Space Telescope: evidence of mass segregation
Bragaglia, A.; Carretta, E.; Ferraro, F. R. +2 more
We present the luminosity function (LF) for the lower main sequence of the Galactic globular cluster NGC6752, as obtained from Hubble Space Telescope (HST) observations centred 2 arcmin from the cluster centre. We present data in the F814W and F555W filters. Our LF reaches down to M_I=11 or, translated to a mass function, to M~=0.12 Msolar. The LF…
A test of Tully-Fisher distance estimates using Cepheids and SNIa
Shanks, T.
We make a direct test of Tully-Fisher distance estimates to 11 spiral galaxies with Hubble Space Telescope (HST) Cepheid distances, and to 12 spiral galaxies with Type Ia supernova (SNIa) distances. The HST Cepheid distances come from the work of Freedman, Sandage et al. and Tanvir et al. The SNIa distances come from Pierce, calibrated using the C…