TY - JOUR
T1 - Estimation of absolute magnitude-dependent galactic model parameters in intermediate latitude with SDSS and SCUSS
AU - Jia, Yunpeng
AU - Du, Cuihua
AU - Wu, Zhenyu
AU - Peng, Xiyan
AU - Ma, Jun
AU - Zhou, Xu
AU - Fan, Xiaohui
AU - Fan, Zhou
AU - Jing, Yipeng
AU - Jiang, Zhaoji
AU - Lesser, Michael
AU - Nie, Jundan
AU - Olszewski, Edward
AU - Shen, Shiyin
AU - Wang, Jiali
AU - Zou, Hu
AU - Zhang, Tianmeng
AU - Zhou, Zhimin
PY - 2014
Y1 - 2014
N2 - Based on the Sloan Digital Sky Survey and South Galactic Cap of u-band Sky Survey (SCUSS) early data, we use a star count method to estimate the Galactic structure parameters in an intermediate latitude with 10 180 main-sequence (MS) stars in an absolute magnitude interval of 4 ≤ Mr ≤ 13. We divide the absolute magnitude into five intervals, 4 ≤ Mr < 5, 5 ≤ Mr < 6, 6 ≤ Mr < 8, 8 ≤ Mr < 10 and 10 ≤ Mr ≤ 13, and estimate the Galactic structure parameters in each absolute magnitude interval to explore their possible variation with the absolute magnitude. Our study shows that the parameters depend on absolute magnitude. For the thin disc, the intrinsic faint MS stars have large local space density and they tend to stay close to the Galactic plane. A plausible explanation is that faint MS stars with long lifetime experience and long gravitational interaction time result in a short scaleheight. However, for the thick disc, the parameters show a complex trend with absolute magnitude, which may imply the complicated original of the thick disc. For the halo, the intrinsic faint MS stars have large local density and small axial ratio, which indicate a flattened inner halo and a more spherical outer halo.
AB - Based on the Sloan Digital Sky Survey and South Galactic Cap of u-band Sky Survey (SCUSS) early data, we use a star count method to estimate the Galactic structure parameters in an intermediate latitude with 10 180 main-sequence (MS) stars in an absolute magnitude interval of 4 ≤ Mr ≤ 13. We divide the absolute magnitude into five intervals, 4 ≤ Mr < 5, 5 ≤ Mr < 6, 6 ≤ Mr < 8, 8 ≤ Mr < 10 and 10 ≤ Mr ≤ 13, and estimate the Galactic structure parameters in each absolute magnitude interval to explore their possible variation with the absolute magnitude. Our study shows that the parameters depend on absolute magnitude. For the thin disc, the intrinsic faint MS stars have large local space density and they tend to stay close to the Galactic plane. A plausible explanation is that faint MS stars with long lifetime experience and long gravitational interaction time result in a short scaleheight. However, for the thick disc, the parameters show a complex trend with absolute magnitude, which may imply the complicated original of the thick disc. For the halo, the intrinsic faint MS stars have large local density and small axial ratio, which indicate a flattened inner halo and a more spherical outer halo.
KW - Galaxy: disc
KW - Galaxy: fundamental parameters
KW - Galaxy: halo
KW - Galaxy: structure
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U2 - 10.1093/mnras/stu469
DO - 10.1093/mnras/stu469
M3 - Article
AN - SCOPUS:84900013911
SN - 0035-8711
VL - 441
SP - 503
EP - 512
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -