Galactic Parameters from Whole Sky 2MASS Star Count

2); (2) Department of Physics; Center of Complex System; C.K. Chang (1); C.M. Ko (1; National Central University; Taiwan; Taiwan); T.H. Peng (1) ((1) Institute of Astronomy

arxiv: 0811.3269 · v1 · submitted 2008-11-20 · 🌌 astro-ph

Galactic Parameters from Whole Sky 2MASS Star Count

C.K. Chang (1) , C.M. Ko (1 , 2) , T.H. Peng (1) ((1) Institute of Astronomy , National Central University , Taiwan , (2) Department of Physics , Center of Complex System

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keywords diskdatamassthickthinwholepowerstar

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The whole sky differential star counts (DSC) with 1 degree resolution are retrieved from 2MASS online data service. Galaxy with double exponential thin and thick disks and a single power law luminosity function (LF) is used to interpret the 2MASS data. The slope of the DSC appears roughly isotropic over the whole sky, the average value is ~0.32, which corresponds to a power law index ~1.8 of the LF. We find that the scale-length and scale-height the thin disk are ~3.0 kpc and ~245 pc, and those of the thick disk are ~3.0 kpc and ~780 pc. The ratio of the thick disk to the thin disk is ~7%. The location of Sun above the disk is ~15 pc. A comparison of the data and model and their discrepancy are also provided.

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Galactic Parameters from Whole Sky 2MASS Star Count

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