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arXiv 1903.00510astro-ph.IMastro-ph.CO
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LSST时代的强透镜超新星Ia:观察透镜发现和时间延迟测量的节奏

Strongly lensed SNe Ia in the era of LSST: observing cadence for lens discoveries and time-delay measurements

S. Huber, S. H. Suyu, U. M. Noebauer, V. Bonvin, D. Rothchild, J. H. H. Chan, H. Awan, F. Courbin, M. Kromer, P. Marshall, M. Oguri, T. Ribeiro, The LSST Dark E… 展开作者

S. Huber, S. H. Suyu, U. M. Noebauer, V. Bonvin, D. Rothchild, J. H. H. Chan, H. Awan, F. Courbin, M. Kromer, P. Marshall, M. Oguri, T. Ribeiro, The LSST Dark Energy Science Collaboration

摘要:

即将到来的大型综合巡天望远镜(LSST)将探测到许多强透镜Ia型超新星(LSNe Ia)的时间延迟宇宙学。这将为测量哈勃常数$H_0$提供一种独立而直接的方法,这对于解决局部距离阶梯和早期宇宙测量之间$H_0$中当前的$4.4 σ$张力是必要的。我们提出了一个详细的分析不同的观测策略的LSST,并量化其影响的LSNe Ia的多个图像之间的时间延迟测量。为此,我们制作了微透镜模拟LSST光变曲线,我们估计了不同图像之间的时间延迟。我们发现,仅使用LSST数据的时间延迟宇宙学是不理想的。相反,我们主张使用LSST作为LSNe Ia的发现机器,使时间延迟测量从其他仪器的后续观测,以增加系统的数量由2到16的一个因素,这取决于观测策略。此外,我们发现,LSST观测策略,提供了一个良好的采样频率(平均夜间间隙约为两天)和高累积的季节长度(10个季节,每个季节的季节长度约为170天),是有利的。滚动法将调查细分,在不同的年份关注不同的部分;这些观察策略以更好的采样频率来换取季节的数量。在我们的调查中,这导致了一半的系统数量相比,最好的观察策略。因此,滚动节奏是不受欢迎的,因为来自增加的采样频率的增益不能补偿缩短的累积季节长度。我们预计,采用我们首选的LSST节奏策略的透镜状Ia型SNe样本,通过快速随访观察,将对$H_0$产生独立的双水平限制。

英文摘要:

The upcoming Large Synoptic Survey Telescope (LSST) will detect many strongly lensed Type Ia supernovae (LSNe Ia) for time-delay cosmography. This will provide an independent and direct way for measuring the Hubble constant $H_0$, which is necessary to address the current $4.4 σ$ tension in $H_0$ between the local distance ladder and the early Universe measurements. We present a detailed analysis of different observing strategies for the LSST, and quantify their impact on time-delay measurement between multiple images of LSNe Ia. For this, we produced microlensed mock-LSST light curves for which we estimated the time delay between different images. We find that using only LSST data for time-delay cosmography is not ideal. Instead, we advocate using LSST as a discovery machine for LSNe Ia, enabling time delay measurements from follow-up observations from other instruments in order to increase the number of systems by a factor of 2 to 16 depending on the observing strategy. Furthermore, we find that LSST observing strategies, which provide a good sampling frequency (the mean inter-night gap is around two days) and high cumulative season length (ten seasons with a season length of around 170 days per season), are favored. Rolling cadences subdivide the survey and focus on different parts in different years; these observing strategies trade the number of seasons for better sampling frequency. In our investigation, this leads to half the number of systems in comparison to the best observing strategy. Therefore rolling cadences are disfavored because the gain from the increased sampling frequency cannot compensate for the shortened cumulative season length. We anticipate that the sample of lensed SNe Ia from our preferred LSST cadence strategies with rapid follow-up observations would yield an independent percent-level constraint on $H_0$.

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