Shah, Paul;
Lemos, Pablo;
Lahav, Ofer;
(2022)
Weak-lensing magnification of Type Ia supernovae from the Pantheon sample.
Monthly Notices of the Royal Astronomical Society
, 515
(2)
pp. 2305-2321.
10.1093/mnras/stac1746.
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Abstract
Using data from the Pantheon Type Ia supernovae (SN Ia) compilation and the Sloan Digital Sky Survey, we propose an estimator for weak-lensing convergence incorporating positional and photometric data of foreground galaxies. The correlation between this and the Hubble diagram residuals of the supernovae has 3.6σ significance, and is consistent with weak-lensing magnification due to dark matter haloes centred on galaxies. We additionally constrain the properties of the galactic haloes, such as the mass-to-light ratio Γ and radial profile of the halo matter density ρ(r). We derive a new relationship for the additional rms scatter in magnitudes caused by lensing, finding σlens = (0.06 ± 0.017)(dC(z)/dC(z = 1))3/2, where dC(z) is the comoving distance to redshift z. Hence, the scatter in apparent magnitudes due lensing will be of the same size as the intrinsic scatter of SN Ia by z ∼ 1.2. We propose a modification of the distance modulus estimator for SN Ia to incorporate lensing, which can be easily calculated from observational data. We anticipate this will improve the accuracy of cosmological parameter estimation for high-redshift SN Ia data.
| Type: | Article |
|---|---|
| Title: | Weak-lensing magnification of Type Ia supernovae from the Pantheon sample |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac1746 |
| Publisher version: | https://doi.org/10.1093/mnras/stac1746 |
| Language: | English |
| Additional information: | © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model) |
| Keywords: | Gravitational lensing: weak, transients: supernovae, cosmology: dark matter, galaxies: haloes, cosmology: cosmological parameters |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10160356 |
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