The Gaiasphere and the limits of knowledge

Details The Gaiasphere and the limits of knowledge The Gaiasphere and the limits of knowledge

2002-08-16

arxiv.org/abs/astro-ph/0208309v1

ASP Conf.Ser.273:155-169,2002

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, invited talk at "The Dynamics, Structure and History of Galaxies", conference in honour of K.C. Freeman

Scientific paper

At the heart of a successful theory of galaxy formation must be a detailed physical understanding of the dissipational processes which form spiral galaxies. To what extent can we unravel the events that produced the Galaxy as we see it today? Could some of the residual inhomogeneities from prehistory have escaped the dissipative process at an early stage? To make a comprehensive inventory of surviving inhomogeneities would require a vast catalog of stellar properties that is presently out of reach. The Gaia space astrometry mission, set to launch at the end of the decade, will acquire detailed phase space coordinates for about one billion stars, within a sphere of diameter 20 kpc -- the Gaiasphere. Here we look forward to a time when all stars within the Gaiasphere have complete chemical abundance measurements (including alpha, s and r process elements). Even with such a vast increase in information, there may exist fundamental -- but unproven -- limits to unravelling the observed complexity.

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