论文标题
基于LAMOST和GAIA数据的SFD和Planck红色地图的验证和校正
Validations and Corrections of the SFD and Planck Reddening Maps Based on LAMOST and Gaia Data
论文作者
论文摘要
粉尘红色的精确校正是获得天体对象的内在参数的基础。 Schlegel等人。 （SFD）和Planck 2D灭绝图广泛用于红色校正。在这项工作中，使用从大型天空区域多对象纤维光谱望远镜（Lamost）数据释放5（DR5）和Gaia DR2的精确红色确定确定，我们检查并校准了中间和高银河系中的SFD和Planck地图。这些地图在红色校正中显示出相似的精度。我们发现四个地图的小而显着的空间依赖性偏差，在SFD和Planck2014-R地图之间与Planck2014-Tau和Planck2019-Tau地图之间相似。这些偏见明显依赖于SFD和Planck2014-R地图的尘埃温度和灭绝。虽然Planck2014-Tau和Planck2019-Tau地图对灰尘温度的依赖性较弱，但它们都在很大程度上取决于尘埃谱指数。最后，我们介绍了Lamost足迹内的SFD和Planck灭绝图的更正，以及在Lamost足迹之外进行更正的经验关系。我们的结果为进一步改善银河全天空灭绝图的进一步改善提供了重要的线索，并为精确天文学时代的准确灭绝校正奠定了重要基础。
Precise correction of dust reddening is fundamental to obtain the intrinsic parameters of celestial objects. The Schlegel et al. (SFD) and the Planck 2D extinction maps are widely used for the reddening correction. In this work, using accurate reddening determinations of about two million stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) data release 5 (DR5) and Gaia DR2, we check and calibrate the SFD and Planck maps in the middle and high Galactic latitudes. The maps show similar precision in reddening correction. We find small yet significant spatially dependent biases for the four maps, which are similar between the SFD and Planck2014-R maps, and between the Planck2014-Tau and Planck2019-Tau maps. The biases show a clear dependence on the dust temperature and extinction for the SFD and Planck2014-R maps. While those of the Planck2014-Tau and Planck2019-Tau maps have a weak dependence on the dust temperature, they both strongly depend on the dust spectral index. Finally, we present corrections of the SFD and Planck extinction maps within the LAMOST footprint, along with empirical relations for corrections outside the LAMOST footprint. Our results provide important clues for the further improvement of the Galactic all-sky extinction maps and lay an significant foundation for the accurate extinction correction in the era of precision astronomy.
