Phlegethon, a Nearby 75°-long Retrograde Stellar Stream

被引：32
作者：
Ibata, Rodrigo A. [1 ]
Malhan, Khyati [1 ]
Martin, Nicolas F. [1 ,2 ]
Starkenburg, Else [3 ]
机构：
[1] Univ Strasbourg, CNRS, Observ Astron, 11 Rue Univ, F-67000 Strasbourg, France
[2] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
[3] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
来源：
ASTROPHYSICAL JOURNAL | 2018年 / 865卷 / 02期
关键词：
galaxies: formation; Galaxy: halo; Galaxy: stellar content; Galaxy: structure; surveys; DARK HALO; SUBSTRUCTURE; EVOLUTION; GALAXY; MASS;
D O I：
10.3847/1538-4357/aadba3
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report the discovery of a 75 degrees-long stellar stream in the Gaia DR2 catalog, found using the new STREAMFINDER algorithm. The structure is probably the remnant of a now fully disrupted globular cluster, which lies approximate to 3.8 kpc away from the Sun in the direction of the Galactic bulge and possesses highly retrograde motion. We find that the system orbits close to the Galactic plane at Galactocentric distances between 4.9 kpc and 19.8 kpc. The discovery of this extended and extremely low surface brightness stream (Sigma(G) similar to 34.3 mag arcsec(-2)), with a mass of only 2580 +/- 140 M-circle dot, demonstrates the power of the STREAMFINDER algorithm to detect even very nearby and ultra-faint structures. Due to its proximity and length, we expect that Phlegethon will be a very useful probe of the Galactic acceleration field.
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页数：6
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