Three spiral galaxies with warped disks have been observed; NGC 4013, NGC 4565, and NGC 6504. There is a clear wavelength dependence in the warp's curve, the...
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PublicationPhotometric observations of the warped disks of NGC 4013, NGC 4565 and NGC 6504
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PublicationPhotometric separation of the bulge and disc components of spirals using CCD imaging
High-resolution CCD images are presented of a sample of spiral galaxies, in infrared photometric bands, obtained at the Cassegrain focus of the 1 m Jacobus...
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PublicationQuantifying the ionising flux escaping from the ultra-luminous HII regions in four spiral galaxies
There are two principal problems in explaining, in terms of the emission from OB stars, the ionisation of the gas which emits the diffuse H-alpha in spiral...
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PublicationReal-Colour Images of Spiral Galaxies
The real-colour images of spiral galaxies reproduced in this Newsletter form part of a new series of such pictures, currently under construction. The original...
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TalkRecovering lenticular galaxies past histories using planetary nebulae kinematics: the case of NGC1023
We present a detailed study of the lenticular galaxy NGC 1023 kinematics. To perform this analysis we use planetary nebulae (PNe). which can be observed in the...
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PublicationResolving the kinematical structure within the nuclear starburst of NGC 253
We present high spectral and spatial resolution spectroscopy of the nuclear starburst region of the galaxy NGC 253. Two slit positions, matching the major and...
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TalkS4G: The Spitzer Survey of Stellar Structure in Galaxies
Galaxies are the basic building blocks of the Universe, and understanding their formation and evolution is crucial to many areas of current astrophysical...
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PublicationSatellite galaxies as probes of the gravitational potentials of large spirals
An aspect of the missing mass problem in galaxies, not easy to address, is whether the dynamical mass distribution is spherical or greatly flattened, following...
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PublicationScale-length determinations of exponential discs of spiral galaxies - A comparison
In the present comparative study of published values for the scale lengths of spiral galaxies' exponential disks, the average value of the discrepancy for more...