论文标题
TDCOSMO II：6个新的时间延迟在MPIA 220万望远镜的高效率监控中的镜头类星体延迟
TDCOSMO II: 6 new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2m telescope
论文作者
论文摘要
我们介绍了在2016年10月至2020年2月之间在La Silla天文台的Max Planck Institute（MPIA）2.2 m望远镜的2.2 m望远镜获得的六个新的时间延迟测量，从2020年10月至2020年2月之间。几乎每天都以高信噪比观察到1606-2333和DES 2325-5229，以获得高质量的光曲线，我们可以记录类星体的快速和小振幅变化。我们测量了所有的多个图像对之间的时间延迟，只有一个或两个季节的监视，除了相对于PSJ 1606-2333的图像D的时间延迟。对于DES 0407-5006的图像A和图像B之间的延迟，获得了最精确的估计，其中$τ_{ab} = -128.4^{+3.5} _ { - 3.8} $ d（2.8％精度），包括由于在光线曲线中的外推性可变性而导致的系统。对于HE 0047-1756，我们将高环境数据与以前Cosmograil活动的长达十年光曲线的测量相结合，并在最终测量中达到0.9 d的精度。目前的工作表明，仅在一个或两个季节中测量镜头类星体中的时间延迟的可行性，前提是在每天接近每天的节奏下获得高信噪比数据。
We present six new time-delay measurements obtained from $R_c$-band monitoring data acquired at the Max Planck Institute for Astrophysics (MPIA) 2.2 m telescope at La Silla observatory between October 2016 and February 2020. The lensed quasars HE 0047-1756, WG 0214-2105, DES 0407-5006, 2M 1134-2103, PSJ 1606-2333 and DES 2325-5229 were observed almost daily at high signal-to-noise ratio to obtain high-quality light curves where we can record fast and small-amplitude variations of the quasars. We measured time delays between all pairs of multiple images with only one or two seasons of monitoring with the exception of the time delays relative to image D of PSJ 1606-2333. The most precise estimate was obtained for the delay between image A and image B of DES 0407-5006, where $τ_{AB} = -128.4^{+3.5}_{-3.8}$ d (2.8% precision) including systematics due to extrinsic variability in the light curves. For HE 0047-1756, we combined our high-cadence data with measurements from decade-long light curves from previous COSMOGRAIL campaigns, and reach a precision of 0.9 d on the final measurement. The present work demonstrates the feasibility of measuring time delays in lensed quasars in only one or two seasons, provided high signal-to-noise ratio data are obtained at a cadence close to daily.
