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research article

STRIDES: automated uniform models for 30 quadruply imaged quasars

Schmidt, T.
•
Treu, T.
•
Birrer, S.
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January 1, 2023
Monthly Notices Of The Royal Astronomical Society

Gravitational time delays provide a powerful one-step measurement of H-0, independent of all other probes. One key ingredient in time-delay cosmography are high-accuracy lens models. Those are currently expensive to obtain, both, in terms of computing and investigator time (10(5)-10(6) CPU hours and similar to 0.5-1 yr, respectively). Major improvements in modelling speed are therefore necessary to exploit the large number of lenses that are forecast to be discovered over the current decade. In order to bypass this roadblock, we develop an automated modelling pipeline and apply it to a sample of 31 lens systems, observed by the Hubble Space Telescope in multiple bands. Our automated pipeline can derive models for 30/31 lenses with few hours of human time and <100 CPU hours of computing time for a typical system. For each lens, we provide measurements of key parameters and predictions of magnification as well as time delays for the multiple images. We characterize the cosmography-readiness of our models using the stability of differences in the Fermat potential (proportional to time delay) with respect to modelling choices. We find that for 10/30 lenses, our models are cosmography or nearly cosmography grade (<3 percent and 3-5 per cent variations). For 6/30 lenses, the models are close to cosmography grade (5-10 per cent). These results utilize informative priors and will need to be confirmed by further analysis. However, they are also likely to improve by extending the pipeline modelling sequence and options. In conclusion, we show that uniform cosmography grade modelling of large strong lens samples is within reach.

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Type
research article
DOI
10.1093/mnras/stac2235
Web of Science ID

WOS:000900308100084

Author(s)
Schmidt, T.
Treu, T.
Birrer, S.
Shajib, A. J.
Lemon, C.  
Millon, M.  
Sluse, D.
Agnello, A.
Anguita, T.
Auger-Williams, M. W.
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Date Issued

2023-01-01

Publisher

OXFORD UNIV PRESS

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

518

Issue

1

Start page

1260

End page

1300

Subjects

Astronomy & Astrophysics

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Astronomy & Astrophysics

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gravitational lensing: strong

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quasars: general

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distance scale

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gravitationally lensed quasars

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time-delay cosmography

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early-type galaxies

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digital sky survey

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hubble constant

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spectroscopic confirmation

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astrometric requirements

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acs survey

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gaia

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discovery

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

Available on Infoscience
January 30, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/194499
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