Wednesday, 2nd May at 2.00pm @ the JAC
Simon Driver
Univ. of St. Andrews, Scotland
"The Millennium Galaxy Catalogue: galaxy bimodality, and the disc, bulge and spheroid
mass functions."
ABSTRACT:
The MGC is a combined optical imaging and spectroscopic survey of 10,000 galaxies.
All objects have been deconstructed into their bulge and disc components using GIM2D.
From this sample we demonstrate that galaxy bimodality is best explained by the
bulge-disc nature of galaxies and argue for two distinct evolutionary mechanisms to
explain galaxy formation. We demonstrate the severity of dust attenuation
particularly for galaxy bulges and show how we can overcome this to produce the
stellar mass functions and integrated stellar mass densities of galaxy discs, bulges
and spheroids. If time allows I'll discuss plans for a more ambitious survey
combining the VST+VISTA+AAT+xNTD facilities to produce a nearby galaxy database
consisting of optical+near-IR+spectra+HI+bulge-disc decompositions for a sample of
around 250k galaxies.
MGC data, catalogues and papers are available from the MGC website:
http://www.eso.org/~jliske/mgc/.
A recent overview of survey results can be found
at astro-ph/0701468
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