论文标题
当地组星系的空间解决研究
Spatially resolved study of the Local Group galaxies
论文作者
论文摘要
我们一直在研究恒星和行星形成的金属性依赖性，尤其是专注于$ \ gtrsim $ 15 kpc的星形中心距离（$ r_g $）的外部星系，其中金属性确定低至$ \ $ \ sim $ sim $$ -1 $ 1 dex。我们已经通过8.2-m Subaru望远镜获得了外星系中年轻群集的近红外（NIR）图像，并显然解决了群集成员的质量检测限值为$ \ sim $ 0.1 $ M_ \ odot $。因此，我们确定外星系中的初始质量函数（IMF）与太阳邻居中有关高质量斜率和IMF峰的最初质量函数（IMF）是一致的。同时，我们建议，原球门磁盘的寿命比太阳能邻居的寿命要短得多。我们还报告了磁盘寿命的金属性依赖性。通过使用ELT使用ELT具有较高空间分辨率和灵敏度的未来观察将使我们能够扩展有关IMF和Protoplanetary磁盘进化的空间解析研究，以扩展到本地组星系。具有高空间分辨率和敏感性（即0.02 Arcsec和$ k \ sim27 $ mag带有自适应光学器件），可以检测到质量为$ \ sim $ 0.1 $ m_ \ odot $的星星，也可以检测到足够的分辨率。基于在更广泛的环境中进行的这样的研究，我们可以获得与恒星和行星形成的环境影响有关的新见解。
We have been investigating the metallicity dependence of star and planet formation, particularly focusing on the outer Galaxy with a Galactocentric distance ($R_g$) of $\gtrsim$15 kpc, where the metallicity is determined to be as low as $\sim$$-$1 dex. We have obtained near-infrared (NIR) images of young clusters in the outer Galaxy through the 8.2-m Subaru Telescope and have clearly resolved the cluster members with mass detection limits of $\sim$0.1 $M_\odot$. Consequently, we determined that the initial mass function (IMF) in the outer Galaxy is consistent with that in the solar neighborhood with regard to high-mass slope and IMF peak. Meanwhile, we suggested that the lifetime of protoplanetary disks is significantly shorter than that in the solar neighborhood. We also reported a metallicity dependence of the disk lifetime. Future observations with higher spatial resolution and sensitivity by using ELT will allow us to extend the spatially resolved studies on the IMF and protoplanetary disk evolution to Local Group galaxies. With high spatial resolution and sensitivity (i.e. 0.02 arcsec and $K\sim27$ mag with an adaptive optics), stars with mass of down to $\sim$0.1 $M_\odot$ can be detected and also sufficiently resolved. Based on such a study in a wider variety of environments, we can gain new insights related to environmental effects of star and planet formation.
