期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 462, 期 4, 页码 3457-3475出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw991
关键词
gravitational lensing: strong; instrumentation: adaptive optics; methods: data analysis; distance scale
资金
- Ministry of Science and Technology in Taiwan [MOST-103-2112-M-001-003-MY3]
- Max Planck Society through Max Planck Research Groups
- NWO-VICI [639.043.308]
- W. M. Keck Foundation
- [NSF-AST-0909119]
- [NSF-AST-1312329]
- Science and Technology Facilities Council [ST/K004182/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien [1450141] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1312329] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [1450141] Funding Source: National Science Foundation
- STFC [ST/K004182/1] Funding Source: UKRI
Accurate and precise measurements of the Hubble constant are critical for testing our current standard cosmological model and revealing possibly new physics. With Hubble Space Telescope (HST) imaging, each strong gravitational lens system with measured time delays can allow one to determine the Hubble constant with an uncertainty of similar to 7 per cent. Since HST will not last forever, we explore adaptive-optics (AO) imaging as an alternative that can provide higher angular resolution than HST imaging but has a less stable point spread function (PSF) due to atmospheric distortion. To make AO imaging useful for time-delay-lens cosmography, we develop a method to extract the unknown PSF directly from the imaging of strongly lensed quasars. In a blind test with two mock data sets created with different PSFs, we are able to recover the important cosmological parameters (time-delay distance, external shear, lens-mass profile slope, and total Einstein radius). Our analysis of the Keck Lambda O image of the strong lens system RXJ 1131-1231 shows that the important parameters for cosmography agree with those based on HST imaging and modelling within 1 sigma uncertainties. Most importantly, the constraint on the model time-delay distance by using AO imaging with 0.09 arcsec resolution is tighter by similar to 50 per cent than the constraint of time-delay distance by using HST imaging with 0.09 arcsec when a power-law mass distribution for the lens system is adopted. Our PSF reconstruction technique is generic and applicable to data sets that have multiple nearby point sources, enabling scientific studies that require high-precision models of the PSF.
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