Issue |
A&A
Volume 443, Number 3, December I 2005
|
|
---|---|---|
Page(s) | 929 - 943 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20041393 | |
Published online | 15 November 2005 |
Galactic structure from the Calar Alto Deep Imaging Survey (CADIS)
1
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
2
Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK e-mail: sp@roe.ac.uk
3
Astronomisches Rechen-Institut, Mönchhofstr. 12–14, 69115 Heidelberg, Germany
Received:
2
June
2004
Accepted:
13
August
2005
We used 1627 faint () stars in five fields
of the Calar Alto Deep Imaging Survey (CADIS) to estimate the
structure parameters of the Galaxy. The results were derived by
applying two complementary methods: first by fitting the density
distribution function to the measured density of stars perpendicular
to the Galactic plane, and second by modelling the observed colors
and apparent magnitudes of the stars in the field, using Monte Carlo
simulations. The best-fitting model of the Galaxy is then determined
by minimising the C-statistic, a modified
. Our
model includes a double exponential for the
stellar disk with scaleheights h1 and h2 and a power law halo with
exponent α.
different parameter
combinations have been simulated. Both methods yield consistent
results: the best fitting parameter combination is
(or
, if we allow for a flattening of the halo with an axial
ratio of
),
pc,
pc, and the contribution of thick disk
stars to the disk stars in the solar neighbourhood is found to be between 4 and 10%.
Key words: Galaxy: structure
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.