A 22° tidal tail for Palomar 5

被引:111
作者
Grillmair, CJ
Dionatos, O
机构
[1] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA
[2] Osserv Astron Roma, INAF, I-00040 Monte Porzio Catone, Italy
基金
美国国家科学基金会; 美国国家航空航天局;
关键词
Galaxy : halo; Galaxy : structure; globular clusters : general; globular clusters : individual (Palomar 5);
D O I
10.1086/503744
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Using Data Release 4 of the Sloan Digital Sky Survey, we have applied an optimal-contrast, matched-filter technique to trace the trailing tidal tail of the globular cluster Palomar 5 to a distance of 18 degrees 5 from the center of the cluster. This more than doubles the total known length of the tail to some 22 degrees on the sky. Based on a simple model of the Galaxy, we find that the stream's orientation on the sky is consistent at the 1.7 sigma level with existing proper-motion measurements. We find that a spherical Galactic halo is adequate to model the stream over its currently known length, and we are able to place new constraints on the current space motion of the cluster.
引用
收藏
页码:L37 / L39
页数:3
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