论文标题

预测使用muztagh-ata 193万望远镜的强烈镜头类星体的时间延迟预测

Forecast of observing time delay of the strongly lensed quasars with Muztagh-Ata 1.93m telescope

论文作者

Zhu, Shanhao, Shu, Yiping, Yuan, Haibo, Fu, Jian-Ning, Gao, Jian, Wu, Jianghua, He, Xiangtao, Liao, Kai, Li, Guoliang, Er, Xinzhong, Hu, Bin

论文摘要

作为一种完全独立的方法,强烈镜头类星体(TDSL)的时间延迟的测量对于解决哈勃张力至关重要。需要进行广泛的监测,但到目前为止,仅限于一小部分明显的类星体样本。北京师范大学与几个合作伙伴机构一起在中国西部的Muztagh-ATA遗址建造了1.93m的反射器望远镜,该地点具有世界一流的观察条件。望远镜将配备三通道成像仪/光度计,覆盖$ 3500-11000 $ Angstrom波长带和低中等分辨率($λ/δλ= 500/2000/7500 $)。在本文中,我们研究了Muztagh-ATA 193万望远镜在测量强烈镜头类星体的时间延迟方面的能力。我们基于五个已知的强镜头类星体,即Rx J1131-1231,HE 0435-1223,PG 1115+080,WFI 2033-4723和SDSS 1206+4332。特别是,RX J1131-1231是在这项工作中使用镜头建模生成的。由于缺乏足够的信息,我们使用镜头建模的公共数据模拟了其他4个系统。根据模拟,对于RX J1131样系统(图像之间的时间延迟之间的较大变化),可以使用约$ΔT= 0.5 $ DAY进行TDSL测量,具有4个季节运动长度和1天的节奏。这种准确性与即将出现的TDCOSMO项目相媲美。当活动长度保持更长和高节奏时,情况会更好。结果,Muztagh-ATA 1.93万望远镜的能力使其可以加入TDSL观测值网络。它将丰富数据库的强烈镜头类星体观测值,并进行更精确的时间延迟测量,尤其是考虑到该站点的独特坐标。

As a completely independent method, the measurement of time delay of strongly lensed quasars (TDSL) are crucial to resolve the Hubble tension. Extensive monitoring is required but so far limited to a small sample of strongly lensed quasars. Together with several partner institutes, Beijing Normal University is constructing a 1.93m reflector telescope at the Muztagh-Ata site in west China, which has the world class observing conditions. The telescope will be equipped with both a three-channel imager/photometer which covers $3500-11000$ Angstrom wavelength band, and a low-medium resolution ($λ/δλ=500/2000/7500$) spectrograph. In this paper, we investigate the capability of Muztagh-Ata 1.93m telescope in measuring time delays of strongly lensed quasars. We generate mock strongly lensed quasar systems and light curves with microlensing effects based on five known strongly lensed quasars, i.e., RX J1131-1231, HE 0435-1223, PG 1115+080, WFI 2033-4723 and SDSS 1206+4332. In particular, RX J1131-1231 is generated with lens modeling in this work. Due to lack of enough information, we simulate the other 4 systems with the public data without lens modeling. According to simulations, for RX J1131-like systems (wide variation in time delay between images) the TDSL measurement can be achieved with the precision about $Δt=0.5$ day with 4 seasons campaign length and 1 day cadence. This accuracy is comparable to the up-coming TDCOSMO project. And it would be better when the campaign length keeps longer and with high cadence. As a result, the capability of Muztagh-Ata 1.93m telescope allows it to join the network of TDSL observatories. It will enrich the database for strongly lensed quasar observations and make more precise measurements of time delays, especially considering the unique coordinate of the site.

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