Galactic longitude dependent Galactic model parameters

Abstract

We present the Galactic model parameters for thin disc estimated by Sloan Digital Sky Survey (SDSS) data of 14 940 stars with apparent magnitudes $16<g_o\le 21$ in six intermediate latitude fields in the first Galactic quadrant. Star/galaxy separation was performed by using the $SDSS$ photometric pipeline and the isodensity contours in the $(g-r{)}_0-(r-i{)}_0$ two colour diagram. The separation of thin disc stars is carried out by the bimodal distribution of stars in the $(g-r{)}_o$ histogram, and the absolute magnitudes were evaluated by a procedure presented in the literature Bilir et al. (2005). Exponential density law fits better to the derived density functions for the absolute magnitude intervals $8<M(g)\le 9$ and $11<M(g)\le 12$, whereas sech/sech${}^2$ laws are more appropriate for absolute magnitude intervals $9<M(g)\le 10$ and $10<M(g)\le 11$. We showed that the scaleheight and scalelength are Galactic longitude dependent. The average values and ranges of the scaleheight and the scalelength are $<H>=220$ pc ($196\le H\le 234$ pc) and $<h>=1900$ pc ($1561\le h\le 2280$ pc) respectively. This result would be useful to explain different numerical values claimed for those parameters obtained by different authors for the fields in different directions of the Galaxy.

28 pages, including 12 figures and 7 tables, accepted for publication in New Astronomy

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