We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubble Frontier Fields galaxy cluster MACS J1149.5+2223. By strictly following the identical modelling methodology (as done in our previous work undertaken before time delays were available), our cosmographic measurements are essentially blind, based on the frozen procedure. Without using any priors from other cosmological experiments, in an open wCDM cosmological model and via our reference cluster mass model, we measure the following values: H0 = 65.1+−3354 km s−1 Mpc−1, ΩDE = 0.76+−001510, and w = −0.92+−001521 (at the 68.3% confidence level). No other single cosmological probe has been able to simultaneously measure all these parameters. Remarkably, our estimated values of the cosmological parameters, in particular that of H0, are very robust and do not significantly depend on the assumed cosmological model or the cluster mass modelling details. The latter aspect introduces systematic uncertainties on the values of H0 and w, which are found to be largely subdominant compared to the statistical errors. The results of this study demonstrate that the combination of time delays in lens galaxy clusters with extensive photometric and spectroscopic information offers a novel and competitive cosmological tool.

Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe / C. Grillo, L. Pagano, P. Rosati, S.H. Suyu. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 684:(2024), pp. L23.1-L23.7. [10.1051/0004-6361/202449278]

Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe

C. Grillo
Primo
;
2024

Abstract

We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubble Frontier Fields galaxy cluster MACS J1149.5+2223. By strictly following the identical modelling methodology (as done in our previous work undertaken before time delays were available), our cosmographic measurements are essentially blind, based on the frozen procedure. Without using any priors from other cosmological experiments, in an open wCDM cosmological model and via our reference cluster mass model, we measure the following values: H0 = 65.1+−3354 km s−1 Mpc−1, ΩDE = 0.76+−001510, and w = −0.92+−001521 (at the 68.3% confidence level). No other single cosmological probe has been able to simultaneously measure all these parameters. Remarkably, our estimated values of the cosmological parameters, in particular that of H0, are very robust and do not significantly depend on the assumed cosmological model or the cluster mass modelling details. The latter aspect introduces systematic uncertainties on the values of H0 and w, which are found to be largely subdominant compared to the statistical errors. The results of this study demonstrate that the combination of time delays in lens galaxy clusters with extensive photometric and spectroscopic information offers a novel and competitive cosmological tool.
cosmological parameters; cosmology: observations; galaxies: clusters: general; gravitational lensing: strong
Settore PHYS-05/A - Astrofisica, cosmologia e scienza dello spazio
   Cosmic Fireworks Première: Unravelling Enigmas of Type Ia Supernova Progenitor and Cosmology through Strong Lensing
   LENSNOVA
   European Commission
   Horizon 2020 Framework Programme
   771776

   GRAvitational lensing in galaxy clusters next-generation proposAL
   GRAAL
   MINISTERO DELL'ISTRUZIONE E DEL MERITO
   2020SKSTHZ_001

   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
2024
24-apr-2024
Article (author)
File in questo prodotto:
File Dimensione Formato  
aa49278-24.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 944.64 kB
Formato Adobe PDF
944.64 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1127180
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 15
social impact