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Parametrization of the Galactic structure by two exponentials
Author(s) -
Karaali S.
Publication year - 2006
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200510478
Subject(s) - physics , galactic plane , parametrization (atmospheric modeling) , galaxy , exponential function , astrophysics , scale height , scale (ratio) , plane (geometry) , length scale , spheroid , space (punctuation) , geometry , magnitude (astronomy) , mathematics , mathematical analysis , optics , quantum mechanics , biochemistry , chemistry , linguistics , philosophy , in vitro , radiative transfer
We parametrized the total structure of the Galaxy in cylindrical coordinates up to z ∼ 10 kpc by using radial and vertical exponentials, covering the thin and thick disc and the inner spheroid. However, we allowed the scale height and scale length to vary continuously with distance from the Galactic plane. The standard deviations for the differences between stellar space densities estimated by means of the newly defined scale heights and scale lengths and the observed space densities for three absolute magnitude intervals, 5 < M ( g ′) ≤ 6, 6 < M ( g ′) ≤ 7, and 7 < M ( g ′) ≤ 8, of the fields SA 114, ELAIS, and # 0952+5245 are rather small. The uncertainties of the scale heights are also small, indicating that this parameter depends very sensitively on the distance from the Galactic plane, whereas those of the scale lengths are larger. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)