用DECam和Gaia对大犬座恒星过密度的修正：蓝色恒星弯曲的新证据
A revised view of the Canis Major stellar overdensity with DECam and Gaia: new evidence of a stellar warp of blue stars
摘要：
我们提出DECam成像结合盖亚DR2数据来研究大犬座的过密度。在色星等图的低污染区域中存在所谓的蓝羽星，这使我们能够推导出这一恒星特征沿其假想核心视线的距离和自行。在银河系低纬度的天空中，恒星过密的范围很大，在平面以下，在230 $^\circ < \ell < 255^\circ$之间。根据推导出的大犬座的轨道，它呈现出绕银河系的面内旋转。此外，在平面周围和整个银河系中发现了额外的高密度蓝羽星，证明这些物体不仅与该结构有关。这些恒星的空间分布，来自盖亚天体测量数据，证实了大犬座超密度的检测结果更多地来自银河系盘的扭曲结构，而不是来自矮星系的吸积。
英文摘要：
We present DECam imaging combined with Gaia DR2 data to study the Canis Major overdensity. The presence of the so-called Blue Plume stars in a low-pollution area of the color-magnitude diagram allows us to derive the distance and proper motions of this stellar feature along the line of sight of its hypothetical core. The stellar overdensity extends on a large area of the sky at low Galactic latitudes, below the plane, and between 230$^\circ < \ell < 255^\circ$. According to the orbit derived for Canis Major, it presents an on-plane rotation around the Milky Way. Moreover, additional overdensities of Blue Plume stars are found around the plane and across the Galaxy, proving that these objects are not only associated with that structure. The spatial distribution of these stars, derived using Gaia astrometric data, confirms that the detection of the Canis Major overdensity results more from the warped structure of the Milky Way disk than from the accretion of a dwarf galaxy.
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