Estimation of Absolute Magnitude-dependent Galactic Model Parameters In Intermediate Latitude With SDSS and SCUSS

Yunpeng Jia; Cuihua Du; Zhenyu Wu; Xiyan Peng; Jun Ma; Xu Zhou; Xiaohui Fan; Zhou Fan; Yipeng Jing; Zhaoji Jiang; Michael Lesser; Jundan Nie; Edward Olszewski; Shiyin Shen; Jiali Wang; Hu Zou; Tianmeng Zhang; Zhimin Zhou

doi:10.1093/mnras/stu469

paper

Estimation of Absolute Magnitude-dependent Galactic Model Parameters In Intermediate Latitude With SDSS and SCUSS

arXiv:1403.3490 · doi:10.1093/mnras/stu469

Abstract

Based on SDSS and South Galactic Cap of u-band Sky Survey (SCUSS) early data, we use star counts method to estimate the Galactic structure parameters in an intermediate latitude with 10,180 main-sequence (MS) stars in absolute magnitude interval of $4 \leq M_{r} \leq 13$ . We divide the absolute magnitude into five intervals: $4 \leq M_{r} < 5$ , $5 \leq M_{r} < 6$ , $6 \leq M_{r} < 8$ , $8 \leq M_{r} < 10$ , $10 \leq M_{r} \leq 13$ , and estimate the Galactic structure parameters in each absolute magnitude interval to explore their possible variation with the absolute magnitude. Our study shows the parameters depend on absolute magnitude. For the thin disk, 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 long gravitational interaction time result in a short scaleheight. However, for the thick disk, the parameters show a complex trend with absolute magnitude, which may imply the complicated original of the thick disk. 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.

10 pages, 5 figures, Accepted for publication in MNRAS

Estimation of Absolute Magnitude-dependent Galactic Model Parameters In Intermediate Latitude With SDSS and SCUSS

Abstract

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