Galactic Parameters from Whole Sky 2MASS Star Counts
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.
Galaxy general - Galaxy stellar content - Galaxy structure - infrared stars
C.K. Chang C.M. Ko T.H. Peng
lnstitute of Astronomy, National Central University, Taiwan Institute of Astronomy, Department of Physics and Center of Complex System, National Central Univers
国际会议
The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)
昆明
英文
103-104
2008-08-03（万方平台首次上网日期，不代表论文的发表时间）