论文标题
使用GAIA的PAN-Starrs1天文统计的改进
Improvements to Pan-STARRS1 Astrometry Using Gaia
论文作者
论文摘要
我们使用GAIA DR2目录来提高Pan-Starrs1 Data Release 2（PS1 DR2）中约17亿个物体的天体精度。我们还为这些PS1对象获得了适当的动作。 Gaia和PS1之间的交叉匹配显示残留物在约1个Arcmin的尺度上相关。我们对具有两个以上检测的所有PS1对象应用空间自适应校正算法，以减少这些残差并将对象位置与Gaia对齐。对于与Gaia匹配的点状PS1对象，该算法将PS1/GAIA残差降低了33％的位置（中位值13.5 MAS减少到9.0 MAS），适当的运动中位数为6.3 MAS/YR/yr的中位数为6.3 mas/yr降至4.8 MAS/YR）。校正位置的残差对于具有最高点状形态并且中间幅度约为17 mag的物体最小。偏差的残余错误在系统上大于右升升的误差。与观测值的空气质量成比例，随着天顶角的偏差误差增加。给定偏斜的位置残差通常随颜色而变化，并且与差异大气折射的影响一致。原则上，可以考虑对象颜色来进一步减少这些残差。
We use the Gaia DR2 catalog to improve the astrometric accuracy of about 1.7 billion objects in Pan-STARRS1 Data Release 2 (PS1 DR2). We also obtain proper motions for these PS1 objects. The cross match between Gaia and PS1 reveals residuals that are correlated on a scale of about 1 arcmin. We apply a spatially adaptive correction algorithm for all PS1 objects having more than two detections to reduce these residuals and align the object positions to Gaia. For point-like PS1 objects that cross match to Gaia, the algorithm reduces PS1/Gaia residuals by 33% in position (median value of 13.5 mas reduced to 9.0 mas) and by 24% in proper motion (median value of 6.3 mas/yr reduced to 4.8 mas/yr). The residuals for the corrected positions are smallest for objects with the most point-like morphologies and with intermediate magnitudes of about 17 mag. The residual errors in declination are systematically larger than those in right ascension; the declination errors increase with zenith angle in proportion to the air mass of the observations. Declination positional residuals at a given declination generally vary with color and are consistent with the effects of differential atmospheric refraction. In principle, these residuals could be reduced further by taking into account object color.
