We present a simple and promising new method to measure the expansion rate and the geometry of the universe that combines observations related to the time delays between the multiple images of time-varying sources, strongly lensed by galaxy clusters, and Type Ia supernovae, exploding in galaxies belonging to the same lens clusters. By means of two different statistical techniques that adopt realistic errors on the relevant quantities, we quantify the accuracy of the inferred cosmological parameter values. We show that the estimate of the Hubble constant is robust and competitive, and depends only mildly on the chosen cosmological model. Remarkably, the two probes separately produce confidence regions on the cosmological parameter planes that are oriented in complementary ways, thus providing in combination valuable information on the values of the other cosmological parameters. We conclude by illustrating the immediate observational feasibility of the proposed joint method in a well-studied lens galaxy cluster, with a relatively small investment of telescope time for monitoring from a 2 to 3 m class ground-based telescope.

Augmenting the power of time-delay cosmography in lens galaxy clusters by probing their member galaxies - I. Type Ia supernovae / A. Acebron Munoz, S. Schuldt, C. Grillo, P. Bergamini, G. Granata, U. Mestric, G.B. Caminha, M. Meneghetti, A. Mercurio, P. Rosati, S.H. Suyu, E. Vanzella. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 1432-0746. - 680:(2023 Dec), pp. L9.1-L9.6. [10.1051/0004-6361/202348090]

Augmenting the power of time-delay cosmography in lens galaxy clusters by probing their member galaxies - I. Type Ia supernovae

A. Acebron Munoz
Primo
;
S. Schuldt
Secondo
;
C. Grillo;P. Bergamini;G. Granata;U. Mestric;
2023

Abstract

We present a simple and promising new method to measure the expansion rate and the geometry of the universe that combines observations related to the time delays between the multiple images of time-varying sources, strongly lensed by galaxy clusters, and Type Ia supernovae, exploding in galaxies belonging to the same lens clusters. By means of two different statistical techniques that adopt realistic errors on the relevant quantities, we quantify the accuracy of the inferred cosmological parameter values. We show that the estimate of the Hubble constant is robust and competitive, and depends only mildly on the chosen cosmological model. Remarkably, the two probes separately produce confidence regions on the cosmological parameter planes that are oriented in complementary ways, thus providing in combination valuable information on the values of the other cosmological parameters. We conclude by illustrating the immediate observational feasibility of the proposed joint method in a well-studied lens galaxy cluster, with a relatively small investment of telescope time for monitoring from a 2 to 3 m class ground-based telescope.
gravitation; gravitational lensing: strong; methods: data analysis; supernovae: general; galaxies: clusters: general; cosmological parameters;
Settore FIS/05 - Astronomia e Astrofisica
   Precision Cosmography with Strong Lensing Galaxy Clusters (ROSEAU)
   ROSEAU
   EUROPEAN COMMISSION
   H2020
   101024195

   Zooming into Dark Matter and proto-galaxies with massive lensing clusters
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   2017WSCC32_002

   GRAvitational lensing in galaxy clusters next-generation proposAL
   GRAAL
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   2020SKSTHZ_001
dic-2023
https://doi.org/10.1051/0004-6361/202348090
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1020755
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