Paulino-Afonso, Ana, González-Gaitán, Santiago, Galbany, Lluís, Maria Mourão, Ana, Angus, Charlotte R., Smith, Mathew, Anderson, Joseph P., Lyman, J. D., Kuncarayakti, Hanindyo and Rodrigues, Myriam (2022) Systematic errors on optical-SED stellar-mass estimates for galaxies across cosmic time and their impact on cosmology. Astronomy & Astrophysics, 662 . A86. doi:10.1051/0004-6361/202142577 ISSN 0004-6361.

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Abstract

Studying galaxies at different cosmic epochs entails several observational effects that need to be taken into account to compare populations across a large time-span in a consistent manner. We use a sample of 166 nearby galaxies that hosted type Ia supernovae (SNe Ia) and have been observed with the integral field spectrograph MUSE as part of the AMUSING survey. Here, we present a study of the systematic errors and bias on the host stellar mass with increasing redshift, which are generally overlooked in SNe Ia cosmological analyses. We simulate observations at different redshifts (0.1 <  z <  2.0) using four photometric bands (griz, similar to the Dark Energy Survey-SN program) to then estimate the host galaxy properties across cosmic time. We find that stellar masses are systematically underestimated as we move towards higher redshifts, due mostly to different rest-frame wavelength coverage, with differences reaching 0.3 dex at z ∼ 1. We used the newly derived corrections as a function of redshift to correct the stellar masses of a known sample of SN Ia hosts and derive cosmological parameters. We show that these corrections have a small impact on the derived cosmological parameters. The most affected is the value of the mass step ΔM, which is reduced by ∼0.004 (6% lower). The dark energy equation of state parameter w changes by Δw∼ 0.006 (0.6% higher) and the value of Ωm increases at most by 0.001 (∼0.3%), all within the derived uncertainties of the model. While the systematic error found in the estimate of the host stellar mass does not significantly affect the derived cosmological parameters, it is an important source of systematic error that needs to be corrected for as we enter a new era of precision cosmology.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Cosmology , Supernovae , Stars -- Masses, Astronomical photometry
Journal or Publication Title:	Astronomy & Astrophysics
Publisher:	EDP Sciences
ISSN:	0004-6361
Official Date:	2022
Dates:	Date Event 2022 Published 21 June 2022 Available 25 January 2022 Accepted
Volume:	662
Article Number:	A86
DOI:	10.1051/0004-6361/202142577
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	3 August 2022
Date of first compliant Open Access:	3 August 2022
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID UIDB/00099/2020 Fundação para a Ciência e a Tecnologia UNSPECIFIED PTDC/FIS-AST-31546/2017 (CRISP) Fundação para a Ciência e a Tecnologia UNSPECIFIED RYC2019-027683 Ministerio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 PID2020-115253GA-I00 (HOSTFLOWS) Ministerio de Ciencia e Innovación http://dx.doi.org/10.13039/501100004837 16599 Villum Fonden http://dx.doi.org/10.13039/100008398 25501 Villum Fonden http://dx.doi.org/10.13039/100008398 MR/T020784/1 UK Research and Innovation http://dx.doi.org/10.13039/100014013

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