Statistics – Computation
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..106a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 106-118. Research supported by Consejeria de Educaci
Statistics
Computation
40
Galactic Structure, Milky Way Galaxy, Open Clusters, Star Formation, Astrography, Astronomical Catalogs, Computational Astrophysics, Interstellar Gas
Scientific paper
A 3D morphological description of the Galactic disk defined by the young stellar population is delineated using a sample of young open clusters with cataloged distances and treated with Kriging techniques. The values of the positional variable Z for the cluster sample are considered as prospectings of the displacement of the Galactic disk in respect to the equator in the plane. The Kriging technique is described with emphasis on its application to the automatic cartography problem. A view of the Galactic disk in a region of about 3 kpc around the sun emerges from this treatment and shows a trough-peak structure with four main depressions as the more striking features. The most prominent depression, named Big Dent, is apparent at about 1.8 kpc in an approximately 240-deg direction. It has an elliptical shape with axis sizes of 1.5 and 3 kpc, reaching a Z value of 200 pc below the formal Galactic plane. Two-dimensional sections across some selected directions of the topography show profiles in good agreement with previous observational studies based on different object samples.
Alfaro Emilio J.
Cabrera-Cano Jesus
Delgado Antonio J.
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