论文标题
在H3调查中发现了麦哲伦恒星碎片
Discovery of Magellanic Stellar Debris in the H3 Survey
论文作者
论文摘要
我们报告了H3调查中发现15颗星的发现，这些恒星在尾随气态麦哲伦流（MS）的尖端附近。星星具有半乳乳速度$ <-155 $ km s $^{ - 1} $，$ \ $ \ $ \ 40 $ \ 40 $至80 kpc（沿MS的增加），[fe/h]与小麦芽岩中的星星一致。这15颗星占H3观察到的94％（15个中的15颗），迄今为止的恒星中有$ r_ {gal}> 37.5 $ kpc，$ -350 km s $ s $^{ - 1} <v_ {gsr} <-155 $ km s $ s $ s $ s $ s $^{ - 1} $，and and sagitarius creamp。它们代表了银河系外晕相空间分布函数的独特部分，并确认即使在Radii上也可以检测到未移除的结构，其中H3仅包含几百个恒星。由于它们的统计过剩，它们与位于位置和速度空间的同一区域的MS和H I紧凑云的密切关联，以及它们与潮汐碎屑的合理对应关系，我们将这些恒星视为过去麦哲伦云相遇的碎片。这些恒星证明了潮汐碎片场的出色成分远离云本身，并在相互作用上提供了独特的约束。
We report the discovery of 15 stars in the H3 survey that lie, in projection, near the tip of the trailing gaseous Magellanic Stream (MS). The stars have Galactocentric velocities $< -155$ km s$^{-1}$, Galactocentric distances of $\approx 40$ to 80 kpc (increasing along the MS), and [Fe/H] consistent with that of stars in the Small Magellanic Cloud. These 15 stars comprise 94% (15 of 16) of the H3 observed stars to date that have $R_{GAL} > 37.5$ kpc, $-$350 km s$^{-1} < V_{GSR} < -155$ km s$^{-1}$, and are not associated with the Sagittarius Stream. They represent a unique portion of the Milky Way's outer halo phase space distribution function and confirm that unrelaxed structure is detectable even at radii where H3 includes only a few hundred stars. Due to their statistical excess, their close association with the MS and H I compact clouds in the same region, both in position and velocity space, and their plausible correspondence with tidal debris in a published simulation, we identify these stars as debris of past Magellanic Cloud encounters. These stars are evidence for a stellar component of the tidal debris field far from the Clouds themselves and provide unique constraints on the interaction.
