Searching Extra-tidal Features around the Globular Cluster Whiting 1

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Jundan Nie Hao Tian Jing Li Chao Liu Martin C. Smith Baitian Tang Julio A. Carballo-Bello Jun Ma Haijun Tian Jiaxin Wang Zhenyu Wu Xiyan Peng Jiali Wang Tianmeng Zhang Xu Zhou Zhimin Zhou Hu Zou

摘要： Whiting 1 is a faint and young globular cluster in the halo of the Milky Way, and was suggested to have originated in the Sagittarius spherical dwarf galaxy (Sgr dSph). In this paper, we use the deep DESI Legacy Imaging Surveys to explore tentative spatial connection between Whiting 1 and the Sgr dSph. We redetermine the fundamental parameters of Whiting 1 and use the best-fitting isochrone (age $\tau$=6.5 Gyr, metalicity Z=0.005 and $\rm d_{\odot}$=26.9 kpc) to construct a theoretical matched filter for the extra-tidal features searching. Without any smooth technique to the matched filter density map, we detect a round-shape feature with possible leading and trailing tails on either side of the cluster. This raw image is not totally new compared to old discoveries, but confirms that no more large-scale features can be detected under a depth of r<=22.5 mag. In our results, the whole feature stretches 0.1-0.2 degree along the orbit of Whiting 1, which gives a much larger area than the cluster core. The tails on both sides of the cluster align along the orbital direction of the Sgr dSph as well as the cluster itself, which implies that these debris are probably stripped remnants of Whiting 1 by the Milky Way.

同行评议状态:待评议

 点击量 26  下载量 17  评论 0