3-D Structure of the Galactic Interstellar Matter: A Contribution from GAIA |
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| Authors: | Jokūbas Sūd?ius Saulius Raudeliūnas Arūnas Ku?inskas Audrius Brid?ius Vladas Vansevi?ius |
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| Institution: | (1) Vilnius University Observatory, Čiurlionio 29, 2009 Vilnius, Lithuania;(2) Institute of Theoretical Physics and Astronomy, Goštauto 12, 2600 Vilnius, Lithuania;(3) Vilnius University Observatory, Čiurlionio 29, 2009 Vilnius, Lithuania;(4) Institute of Physics, Goštauto 12, Vilnius, 2600, Lithuania |
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| Abstract: | We investigate the possibilities for tracing interstellar extinction with the ESA's astrometric space mission GAIA. The analysis
is based on detailed simulations of the GAIA photometry, which are used to derive the distribution of interstellar matter
in a modelled Galaxy. We find that `small' diffuse clouds (diameter D = 4 pc, E
B-V = 0.06) will be easily traced with GAIA up to the distances of ∼ 800 pc. `Large' diffuse interstellar clouds (D = 10 pc, E
B-V = 0.13) will be located up to the distances of ∼ 2.5 kpc. This holds for the reddening tracers of spectral types O – K2 brighter
than V = 17. Inmost cases, due to their low spatial density, the early type stars (O– A2) cannot provide reliable information about
the distribution of interstellar matter. None of the reddening tracers measured by GAIA will provide reliable identification
of the individual interstellar clouds beyond the distances of ∼ 3 kpc. Therefore, we conclude that the information available
from photometric observations will be not sufficient for the detailed reconstruction of the 3-D distribution of Galactic interstellar
matter. It is therefore extremely important to define the new strategies which would allow to combine all the available information,
including the earlier space- and/or ground-based investigations, together with the information which will be provided by GAIA
itself (parallaxes, E
B-V etc.).
This revised version was published online in July 2006 with corrections to the Cover Date. |
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