Point spread function reconstruction of adaptive-optics imaging: meeting the astrometric requirements for time-delay cosmography
Point spread function reconstruction of adaptive-optics imaging: meeting the astrometric requirements for time-delay cosmography
复制标题
自适应光学成像的点扩散函数重建:满足时滞宇宙学的天体测量要求
DOI:
10.1093/mnras/stab2587
复制
发表时间:
2021
影响因子:
4.8
通讯作者:
Suyu, Sherry H
中科院分区:
文献类型:
--
作者:
Chen, Geoff C-F;Treu, Tommaso;Fassnacht, Christopher D;Ragland, Sam;Schmidt, Thomas;Suyu, Sherry H
Astrometric precision and knowledge of the point spread function are key ingredients for a wide range of astrophysical studies including time-delay cosmography in which strongly lensed quasar systems are used to determine the Hubble constant and other cosmological parameters. Astrometric uncertainty on the positions of the multiply-imaged point sources contributes to the overall uncertainty in inferred distances and therefore the Hubble constant. Similarly, knowledge of the wings of the point spread function is necessary to disentangle light from the background sources and the foreground deflector. We analyse adaptive optics (AO) images of the strong lens system J 0659+1629 obtained with the W. M. Keck Observatory using the laser guide star AO system. We show that by using a reconstructed point spread function we can (i) obtain astrometric precision of <1 mas, which is more than sufficient for time-delay cosmography; and (ii) subtract all point-like images resulting in residuals consistent with the noise level. The method we have developed is not limited to strong lensing, and is generally applicable to a wide range of scientific cases that have multiple point sources nearby.
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影响因子:
4.8
作者:
S. Ragland
通讯作者:
S. Ragland
影响因子:
6.5
作者:
S. Hilbert;J. Hartlap;S. White;P. Schneider
通讯作者:
S. Hilbert;J. Hartlap;S. White;P. Schneider
影响因子:
4.8
作者:
Kochanek, C S
通讯作者:
Kochanek, C S
影响因子:
4.8
作者:
Collett, Thomas E.;Marshall, Philip J.;Blandford, Roger D.
通讯作者:
Blandford, Roger D.
DOI:
10.1117/12.2560805
发表时间:
2020
期刊:
--
影响因子:
--
作者:
Beltramo-Martin O
通讯作者:
Beltramo-Martin O