The mid-infrared Leavitt law for classical Cepheids in the Magellanic Clouds
The mid-infrared Leavitt law for classical Cepheids in the Magellanic Clouds
复制标题
DOI：
10.1093/mnras/staa3186
复制
发表时间：
2020-10
影响因子：
4.8
通讯作者：
Abigail H. Chown;V. Scowcroft;S. Wuyts
中科院分区：
文献类型：
--
作者：
Abigail H. Chown;V. Scowcroft;S. Wuyts
造父变星莱维特定律（LL），也被称为周期-亮度关系，是组装宇宙距离阶梯的重要工具。通过结合OGLE-IV目录与斯皮策太空望远镜的中红外测光的数据，我们已经确定了3.6 $ $\mu$$m和4.5 $ $\mu$m的麦哲伦云使用约5000个基本模式的经典造父变星的LLS。平均星等是使用蒙特卡罗马尔可夫链（MCMC）模板拟合程序确定的，模板光变曲线是从这些造父变星的子样本中构建的，具有全相位，良好采样的光变曲线。除了线性关系外，还测试了大麦哲伦云LL系数对各种周期切割的依赖性。LL的零点是使用哈勃太空望远镜和盖亚数据发布2的银河系造父变星的视差校准的。我们最终校准的关系是$M_{[3.6]} = -3.246（\pm 0.008）（\log（P）-1.0）-5.784（\pm 0.030）$和$M_{[4.5]} = -3.162（\pm 0.008）（\log（P）-1.0）-5.751（\pm 0.030）$。
The Cepheid Leavitt Law (LL), also known as the Period-Luminosity relation, is a crucial tool for assembling the cosmic distance ladder. By combining data from the OGLE-IV catalogue with mid-infrared photometry from the Spitzer Space Telescope, we have determined the $3.6$ $\mu$m and $4.5$ $\mu$m LLs for the Magellanic Clouds using around 5000 fundamental-mode Classical Cepheids. Mean magnitudes were determined using a Monte Carlo Markov Chain (MCMC) template fitting procedure, with template light curves constructed from a subsample of these Cepheids with fully-phased, well-sampled light curves. The dependence of the Large Magellanic Cloud LL coefficients on various period cuts was tested, in addition to the linearity of the relationship. The zero point of the LL was calibrated using the parallaxes of Milky Way Cepheids from the Hubble Space Telescope and Gaia Data Release 2. Our final calibrated relations are $M_{[3.6]} = -3.246(\pm 0.008)(\log(P)-1.0)-5.784(\pm 0.030)$ and $M_{[4.5]} = -3.162(\pm 0.008)(\log(P)-1.0)-5.751(\pm 0.030)$.