论文标题
使用Gaia EDR3进行头孢虫距离校准的当前挑战
Current Challenges in Cepheid Distance Calibrations Using Gaia EDR3
论文作者
论文摘要
使用Gaia早期数据版本3（EDR3）的视差，我们确定了多波长BVI，JHK和[3.6]和[4.5] Micron的绝对幅度，用于附近的银河系附近的Cepheids，覆盖5到60天之间的周期范围。我们将这些周期的稀疏关系应用于大小的麦哲伦云中的头孢菌素，发现派生距离在根据脱落的二进制文件（DEBS）的几何距离上显着差异。我们探讨了这些问题的几个潜在原因，包括红色，金属性和额外的零点偏移的存在，但没有一个与两个DEB距离一起提供足够的和解。我们得出的结论是，EDR3视差上的系统不确定性与金属性对CephEID距离量表的影响的不确定性的组合导致系统的误差地板约为3％。因此，我们发现在这些明亮的头孢虫的制度中，EDR3数据与许多当代研究一致，在这些明亮的头孢虫的制度中不足以确定精确至1％水平的距离。
Using parallaxes from Gaia Early Data Release 3 (EDR3), we determine multi-wavelength BVI, JHK, and [3.6] & [4.5] micron absolute magnitudes for 37 nearby Milky Way Cepheids, covering the period range between 5 and 60 days. We apply these period-luminosity relations to Cepheids in the Large and Small Magellanic Clouds, and find that the derived distances are significantly discrepant with the geometric distances according to detached eclipsing binaries (DEBs). We explore several potential causes of these issues, including reddening, metallicity, and the existence of an additional zero-point offset, but none provide a sufficient reconciliation with both DEB distances. We conclude that the combination of the systematic uncertainties on the EDR3 parallaxes with the uncertainties on the effect of metallicity on the Cepheid distance scale leads to a systematic error floor of approximately 3%. We therefore find that the EDR3 data is not sufficiently accurate in the regime of these bright Cepheids to determine extragalactic distances precise to the 1% level at this time, in agreement with a number of contemporary studies.
