Estimation of Galactic Model Parameters and Metalicity Distribution in Intermediate Latitudes with SDSS

Details Estimation of Galactic Model Parameters and Metalicity Distribution in Intermediate Latitudes with SDSS Estimation of Galactic Model Parameters and Metalicity Distribution in Intermediate Latitudes with SDSS

2009-07-30

arxiv.org/abs/0907.5295v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

31 pages, 18 figures and 4 tables, accepted for publication in New Astronomy

Scientific paper

We estimated the galactic model parameters for a set of 20 intermediate-latitude fields with galactic longitudes 0=6.52% and <(n_{3}/n_{1})>=0.35%, respectively, a result different than the one cited for high-latitude fields. The thin disc's scaleheight is 325 pc in the galactic centre changes to 369 pc in the third quadrant, which confirms the existence of disc flare, whereas the thick disc scaleheight is as large as 952 pc at galactic longitude l=20 and 10% lower at l=160, which confirms the existence of the disc long bar in the direction l=27. Finally, the variation of the axis ratio of the halo with galactic longitude is almost flat, <(c/a)>=0.56, except a slight minimum and a small maximum in the second and third quadrants, respectively, indicating an effect of the long bar which seems plausible for a shallow halo. We estimated the metallicities of unevolved G-type stars and discussed the metallicity gradient for different vertical distances. The metallicity gradient is d[M/H]/dz=-0.30 dex kpc$^{-1}$ for short distances, confirming the formation of this region of the Galaxy by dissipational collapse. However, its change is steeper in the transition regions of different galactic components. The metallicity gradient is almost zero for inner halo (5

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