This thesis describes the implementation and results of a prograunue
of photometry of the relatively nearby southern cluster of galaxies
and X -ray source, Abell 1060 = Hydra I.
Photographic photometry in B and V wavebands of galaxies in
a ~22 degree² region centred on this cluster have been obtained on
the basis of measurements of four U.K. Schmidt telescope plates by
the COSMOS measuring machine at the Royal Observatory, Edinburgh.
The feasibility of using the COSMOS machine to derive reliable isophotal magnitudes of bright and faint galaxies is demonstrated.
Multiaperture photoelectric (U, B, V and R -band) photometry has
been secured of sixteen galaxies in the field of the cluster, including seven NGC and IC systems. Besides providing photometric calibration, these observations permit the total magnitudes and colours of
several galaxies to be derived.
The positions and magnitudes of over 5000 galaxies, supplemented
in many cases by morphological classifications, by micrometric measurements of dimensions and alignment, and by redshift data, have been
analysed to determine the static and dynamical properties of A1060.
The cluster is symmetric, centrally condensed, and rich in disk galaxies; members segregate radially by morphological type, with spiral
galaxies generally farthest from the centre.
The V -band luminosity function of A1060 has been constructed.
It is similar in form but different in detail from those of other
clusters. The colour -magnitude relation of early -type galaxies in
A1060 is outlined, and is shown to be inconsistent with one prediction of a standard theory of the morphological evolution of
galaxies and clusters.
Visual searches for low surface brightness members of A1060
are described. It is suggested that fewer such galaxies exist than
an extrapolation of the luminosity function for all galaxy types to
faint magnitudes would predict.
Peculiar properties of four galaxies near the centre of the
cluster are interpreted in terms of the influence of their environments. Three are anaemic spirals, for which there is strong evidence
that an era of gas depletion has recently begun. The first- ranked
member, N3311, is an extended system of low mean surface brightness,
and may represent a D galaxy in the early stages of evolution. These
observations suggest that the cluster Abell 1060 is relatively young
in dynamical terms.