|IAU Colloquium 174 on "Small
Galaxy Groups" was held in Turku, Finland, 13th-18th June 1999. The meeting
was supported by Commissions 28 and 7 and Division VIII of the IAU, and
supported by the Academy of Finland, the University of Turku and the International
The proceedings will be published in the PASP conference series. The deadline
is 31st August 1999.
Invited talks (30 minutes or more) - 10 pages.
Long talks (20 or 25 minutes) - 6 pages.
Short talks (15 minutes) and Posters - 4 pages.
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Triple galaxies are the smallest groups of galaxies, and together with
binaries and other small groups fill the gap between single galaxies and
richer groups and clusters. The Local Group is an example of a system in
this category, where the dynamics are more complex than in binary galaxies,
and where the methods of the few body problem can be applied in the galactic
scale. Such systems may include many smaller galaxies along with the dominant
ones; thus the topic of this conference is generally systems of 3+N galaxies,
where N is at most a few dozens. They cover a wide range of scales from
50 kpc to 700 kpc.
Triple systems of galaxies; theory and observations
Small groups of galaxies
The Local Group of Galaxies
Interactions and mergers in triplets
Free-fall triplets and cosmological structure formation
The Extended Local Group
Evolution from triplets to binaries
The role of triplets in cluster dynamics
Triplets at high redshift
Dark matter in small groups
This will be the first major conference devoted to triple Galaxies as
an example of Small Groups of Galaxies. The importance of the number three
is related to the questions of stability: Two major galaxies can form a
stable system, a triple system cannot. The number three brings chaos into
the dynamical system, and thus many new questions enter immediately: why
do we observe triples at all, or at what stage of the evolution of the
Universe do we observe them. How long do these transitory configurations
survive, and how are they related to dark matter and other cosmological
parameters? One would expect that an understanding of triple galaxies would
bring us a long way on the road of understanding the evolution of galaxies
in an expanding universe in general.
Dynamically, triples form a separate and well defined problem, different
from binaries and from richer groups. Observationally the data base is
rapidly increasing with new campaigns performed at SAO, Russia and in the
Southern Sky; the Hubble Space Telescope is bringing new material on triplets
at large redshifts while numerical simulations are rapidly attaining sufficient
resolution that the problem of triplets can be addressed properly.
is available as well as regularly updated list of talks
and posters is available as well as a list of abstracts
|Scientific Organising Committee
|Juan C. Muzzio