STRIDES: automated uniform models for 30 quadruply imaged quasars

Desai, Shantanu (2023) STRIDES: automated uniform models for 30 quadruply imaged quasars. Monthly Notices of the Royal Astronomical Society, 518 (1). pp. 1260-1300. ISSN 0035-8711

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Abstract

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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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Uncontrolled Keywords:

gravitational lensing; strongquasars; general distance scale; GRAVITATIONALLY LENSED QUASARS; TIME-DELAY COSMOGRAPHYEARLY-TYPE GALAXIESDIGITAL SKY SURVEYHUBBLE CONSTANT; SPECTROSCOPIC CONFIRMATION; ASTROMETRIC REQUIREMENTSACS; SURVEY; GAIA; DISCOVERY

Subjects:

Physics
Physics > Classical mechanics
Physics > Modern physics

Divisions:

Department of Physics

Depositing User:

Mr Nigam Prasad Bisoyi

Date Deposited:

18 Aug 2023 08:43

Last Modified:

18 Aug 2023 08:43

URI:

http://raiithold.iith.ac.in/id/eprint/11569