TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2 m telescope
TDCOSMO: II. Six new time delays in lensed quasars from high-cadence monitoring at the MPIA 2.2 m telescope
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TDCOSMO：二。
DOI：
10.1051/0004-6361/202038698
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发表时间：
2020
影响因子：
6.5
通讯作者：
Anguita, T.
中科院分区：
文献类型：
--
作者：
Millon, M.;Courbin, F.;Bonvin, V.;Buckley-Geer, E.;Fassnacht, C. D.;Frieman, J.;Marshall, P. J.;Suyu, S. H.;Treu, T.;Anguita, T.
我们提出了2016年10月至2020年2月在拉西拉天文台的马克斯普朗克天体物理研究所（MPIA）2.2米望远镜获得的RC波段监测数据中获得的六个新的时间延迟测量。透镜类星体HE 0047−1756、WG 0214−2105、DES 0407−5006、2M 1134−2103、PSJ 1606−2333和DES 2325−5229几乎每天都在高信噪比下被观测，以获得高质量的光变曲线，我们可以记录类星体的快速和小幅变化。我们测量了所有对多个图像之间的时间延迟，只有一个或两个季节的监测，除了相对于PSJ 1606−2333的imageD的时间延迟。DES 0407−5006的imageA和imageB之间的延迟获得了最精确的估计，其中d（2.8%精度）包括由于光变曲线中的外在变化引起的系统学。对于HE 0047−1756，我们将高步频数据与之前COSMOGRAIL活动的十年光变曲线测量结果相结合，最终测量精度达到0.9 d。目前的工作表明，在透镜类星体的时间延迟测量的可行性，只有一个或两个赛季，提供高信噪比的数据，在接近每天的节奏。
We present six new time-delay measurements obtained fromRc-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 imageDof PSJ 1606−2333. The most precise estimate was obtained for the delay between imageAand imageBof DES 0407−5006, where 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.