处女座巨型椭圆星系的球状星团系统NGC 4636：I。Subaru/FOCAS光谱和数据库
The Globular Cluster System of the Virgo Giant Elliptical Galaxy NGC 4636: I. Subaru/FOCAS Spectroscopy and Database
摘要：
对室女星系团中的巨型椭圆星系NGC 4636中的球状星团进行了光谱研究。我们选择目标GC候选人使用华盛顿测光来自深CCD图像在KPNO 4米。在此基础上，利用SUBARU 8.2米望远镜的弱天体照相摄谱仪（FOCAS）的多目标光谱（MOS）模式，获得了NGC 4636视场内164个目标天体的光谱。我们测量了122个天体的速度：NGC 4636中的105个GC，NGC 4636的核心，11颗前景星，2个背景星系，以及室女星系团中的3个可能的团内GC。NGC 4636中的GC位于投影的银河系中心半径10弧分（相当于43千秒差距）以内。GCs的速度变化范围为300 ~ 1600 km/s，平均值为932 - 22 ^{+25} km/s，与NGC 4636的核速度928 \pm 45 km/s符合得很好。NGC 4636中GC的速度频散为231 - 17 ^+15 km/s，蓝色GC的速度频散略大于红色GC。结合我们的结果与文献中的数据，我们产生了一个主目录的径向速度NGC 4636中的238 GC。总星表中的GC速度频散为225 - 9 ^{+12} km/s，108个蓝色GC为251 - 12 ^{+18} km/s，130个红色GC为205 - 13 ^{+11} km/s。
英文摘要：
We present a spectroscopic study of the globular clusters (GCs) in the giant elliptical galaxy NGC 4636 in the Virgo cluster. We selected target GC candidates using the Washington photometry derived from the deep CCD images taken at the KPNO 4m. Then we obtained the spectra of 164 target objects in the field of NGC 4636 using the Multi-Object Spectroscopy (MOS) mode of Faint Object Camera and Spectrograph (FOCAS) on the SUBARU 8.2m Telescope. We have measured the velocities for 122 objects: 105 GCs in NGC 4636, the nucleus of NGC 4636, 11 foreground stars, 2 background galaxies, and 3 probable intracluster GCs in the Virgo cluster. The GCs in NGC 4636 are located in the projected galactocentric radius within 10arcmin (corresponding to 43 kpc). The measured velocities for the GCs range from 300km/s to 1600km/s, with a mean value of 932_{-22}^{+25} km/s, which is in good agreement with the velocity for the nucleus of NGC 4636, 928\pm 45 km/s. The velocity dispersion of the GCs in NGC 4636 is derived to be 231_{-17}^{+15} km/s and the velocity dispersion of the blue GCs is slightly larger than that of the red GCs. Combining our results with data in the literature, we produce a master catalog of radial velocities for 238 GCs in NGC 4636. The velocity dispersion of the GCs in the master catalog is found to be 225_{-9}^{+12} km/s for the entire sample, 251_{-12}^{+18} km/s for 108 blue GCs, and 205_{-13}^{+11} km/s for 130 red GCs.
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