Search Publications
A hyperluminous galaxy at z=2.8 found in a deep submillimetre survey
Kneib, J. -P.; Ivison, R. J.; Smail, Ian +5 more
We present a detailed study of SMM02399-0136, a hyperluminous, active galaxy selected from a submm survey of the distant Universe. This galaxy is the brightest source in the fields of six rich, lensing clusters, with a total area of 0.01deg^2, that we have mapped with a sensitivity of ~2mJybeam^-1 at 850mum. We identify a compact optical counterpa…
HST, radio and infrared observations of 28 3CR radio galaxies at redshift z~1 - II. Old stellar populations in central cluster galaxies
Best, P. N.; Longair, M. S.; Roettgering, H. J. A.
Hubble Space Telescope images of 3CR radio galaxies at redshifts 0.6<z<1.8 have shown a remarkable variety of structures, generally aligned along the radio axis, indicating that the radio source strongly influences the optical appearance of these galaxies. In this paper we investigate the host galaxies underlying this aligned emission, combi…
Quantitative spectroscopy of Wolf-Rayet stars in HD97950 and R136a - the cores of giant HII regions
Crowther, P. A.; Dessart, Luc
We present quantitative analyses of Wolf-Rayet stars in the cores of two giant Hii regions - HD97950 in NGC3603 and R136a in 30 Doradus - based on archive Hubble Space Telescope (HST) spectroscopy. We confirm previous WN6h+abs classifications for components A1, B and C in HD97950, while classifications for R136a1-3 are revised from O3If^*/WN6 to W…
High-redshift galaxies in the Hubble Deep Field - II. Colours and number counts
Ferguson, Henry C.; Madau, Piero; Zamorani, Gianni +2 more
We discuss the deep galaxy counts from the Hubble Deep Field (HDF) imaging survey. At faint magnitudes, the slope of the differential number-magnitude relation is flatter than 0.2 in all four HDF bandpasses. In the ultraviolet, a fluctuation analysis shows that the flattening observed below U_300~26 mag is not caused by incompleteness and is more …
HSTcolour-magnitude diagrams of six old globular clusters in the LMC
Suntzeff, N. B.; Walker, A. R.; Mateo, M. +4 more
We report on HST observations of six candidate old globular clusters in the Large Magellanic Cloud (LMC): NGC 1754, 1835, 1898, 1916, 2005 and 2019. Deep exposures with the F555W and F814W filters provide us with colour-magnitude diagrams that reach to an apparent magnitude in V of ~25, well below the main-sequence turn-off. These particular clust…
HST images of a galaxy group at z=2.81, and the sizes of damped Lyalpha galaxies
Møller, P.; Warren, S. J.
We present Hubble Space Telescope (HST) WFPC2 observations in three bands (F450W=B, F467M and F814W=I) of a group of three galaxies at z=2.8 discovered in a ground-based narrow-band search for Lyalphaemission near the z=2.8 quasar PKS 0528-250. One of the galaxies is a damped Lyalpha(DLA) absorber and these observations bear on the relation betwee…
The dynamical evolution of stellar superclusters
Kroupa, Pavel
Recent images taken with the Hubble Space Telescope (HST) of the interacting disc galaxies NGC 4038/4039 (the Antennae) reveal clusters of many dozens and possibly hundreds of young compact massive star clusters within projected regions spanning about 100 to 500 pc. It is shown here that a large fraction of the individual star clusters merge withi…
The z=2.72 galaxy cB58: a gravitational fold arc lensed by the cluster MS1512+36
Saglia, R. P.; Bender, Ralf; Seitz, Stella +3 more
Using HST WFPC2 V- and R-band data of the z=0.37 cluster MS 1512+36, we show that the z=2.72 `protogalaxy' cB58 is not extraordinarily luminous intrinsically but lensed into a gravitational fold arc by the cluster. The arc has a surface- brightness-weighted axis ratio of 1:7, is marginally resolved in width and about 3 arcsec long. Its counterimag…
The nature of the cometary knots in the Helix planetary nebula (NGC7293)
Walsh, J. R.; Steffen, W.; Meaburn, J. +3 more
The system of cometary knots in the Helix planetary nebula (NGC7293) has been systematically observed using ground-based images and long-slit, high-resolution spectroscopy. CCD images in the [Nii] 6584-A line, taken with the ESO NTT, are used to determine the spatial distribution of the knots; images in the [Oiii] 5007-A line distinguish their pos…
HST Planetary Camera images of quasar host galaxies
Boksenberg, A.; Macchetto, F. D.; Crane, P. +6 more
We present Hubble Space Telescope (HST) images of seven low-redshift quasars (six taken with the Planetary Camera, one with the Wide Field Camera). These complete the sample of 14 quasars observed by the Faint Object Camera Investigation Definition Team (FOC IDT). Following subtraction of the quasar nuclear light, host galaxies can be seen in all …