Michael Drinkwater

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We describe a population of compact objects in the centre of the Fornax Cluster which were discovered as part of our 2dF Fornax Spectroscopic Survey. These objects have spectra typical of old stellar systems, but are unresolved on photographic sky survey plates. They have absolute magnitudes –13 < M B < –11, so they are 10 times more luminous than any(More)
Accepted —. Received —; in original form — ABSTRACT QSO absorption spectra provide an extremely useful probe of possible cosmological variation in various physical constants. Comparison of H i 21 cm absorption with corresponding molecular (rotational) absorption spectra allows us to constrain variation in y ≡ α 2 g p where α is the fine structure constant(More)
Recent detections of high-redshift absorption by both atomic hydrogen and molecular gas in the radio spectra of quasars have provided a powerful tool to measure possible temporal and spatial variations of physical 'constants' in the Universe. We have compared the frequency of high-redshift Hydrogen 21 cm absorption with that of associated molecular(More)
A recent all-object spectroscopic survey centred on the Fornax cluster of galaxies, has discovered a population of sub-luminous and extremely compact members, called " ultra-compact dwarf " (UCD) galaxies. In order to clarify the origin of these objects, we have used self-consistent numerical simulations to study the dynamical evolution a nucleated dwarf(More)
We present a detailed analysis of high-resolution two-band Hubble Space Telescope Advanced Camera for Surveys imaging of 21 ultra-compact dwarf (UCD) galaxies in the Virgo and Fornax Clusters. The aim of this work is to test two formation hypotheses for UCDs—whether they are bright globular clusters (GCs) or stripped (" threshed ") early-type dwarf(More)
This report has not been formally peer reviewed. The opinions expressed here reflect those of the authors, and not necessarily those of their home institutions or supporting organizations. Abstract This analytical report is the outcome of a restudy that was undertaken in January 2005 of an original study undertaken in 1993 of the impact of HIV/AIDS on(More)