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ZTF SN Ia DR2: Peculiar velocities' impact on the Hubble diagram

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ZTF SN Ia DR2: Peculiar velocities' impact on the Hubble diagram. / Carreres, B.; Rosselli, D.; Bautista, J.E. et al.
In: Astronomy and Astrophysics, Vol. 694, A8, 28.02.2025.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Carreres, B, Rosselli, D, Bautista, JE, Feinstein, F, Fouchez, D, Racine, B, Ravoux, C, Sanchez, B, Dimitriadis, G, Goobar, A, Johansson, J, Nordin, J, Rigault, M, Smith, M, Amenouche, M, Aubert, M, Barjou-Delayre, C, Burgaz, U, D’ arcy Kenworthy, W, De Jaeger, T, Dhawan, S, Galbany, L, Ginolin, M, Kuhn, D, Kowalski, M, Müller-Bravo, TE, Nugent, PE, Popovic, B, Rosnet, P, Ruppin, F, Sollerman, J, Terwel, JH, Townsend, A, Groom, SL, Kulkarni, SR, Purdum, J, Rusholme, B & Sravan, N 2025, 'ZTF SN Ia DR2: Peculiar velocities' impact on the Hubble diagram', Astronomy and Astrophysics, vol. 694, A8. https://doi.org/10.1051/0004-6361/202450389

APA

Carreres, B., Rosselli, D., Bautista, J. E., Feinstein, F., Fouchez, D., Racine, B., Ravoux, C., Sanchez, B., Dimitriadis, G., Goobar, A., Johansson, J., Nordin, J., Rigault, M., Smith, M., Amenouche, M., Aubert, M., Barjou-Delayre, C., Burgaz, U., D’ arcy Kenworthy, W., ... Sravan, N. (2025). ZTF SN Ia DR2: Peculiar velocities' impact on the Hubble diagram. Astronomy and Astrophysics, 694, Article A8. https://doi.org/10.1051/0004-6361/202450389

Vancouver

Carreres B, Rosselli D, Bautista JE, Feinstein F, Fouchez D, Racine B et al. ZTF SN Ia DR2: Peculiar velocities' impact on the Hubble diagram. Astronomy and Astrophysics. 2025 Feb 28;694:A8. Epub 2025 Feb 14. doi: 10.1051/0004-6361/202450389

Author

Carreres, B. ; Rosselli, D. ; Bautista, J.E. et al. / ZTF SN Ia DR2 : Peculiar velocities' impact on the Hubble diagram. In: Astronomy and Astrophysics. 2025 ; Vol. 694.

Bibtex

@article{8c10b02e22584e7691d4f2d858b23168,
title = "ZTF SN Ia DR2: Peculiar velocities' impact on the Hubble diagram",
abstract = "Type Ia supernovae (SNe Ia) are used to determine the distance-redshift relation and build the Hubble diagram. Neglecting their host-galaxy peculiar velocities (PVs) may bias the measurement of cosmological parameters. The smaller the redshift, the larger the e_ect is. We used realistic simulations of SNe Ia observed by the Zwicky Transient Facility (ZTF) to investigate the effect of different methods of taking PVs into account. We studied the impact of neglecting galaxy PVs and their correlations in an analysis of the SNe Ia Hubble diagram. We find that it is necessary to use the PV full covariance matrix computed from the velocity power spectrum to take the sample variance into account. Considering the results we have obtained using simulations, we determine the PV systematic e_ects in the context of the ZTF SN Ia DR2 sample. We determine the PV impact on the intercept of the Hubble diagram, aB, which is directly linked to the measurement of H0. We show that not taking into account PVs and their correlations results in a shift in the H0 value of about 1.0 km s -1 Mpc -1 and a slight underestimation of the H0 error bar.",
author = "B. Carreres and D. Rosselli and J.E. Bautista and F. Feinstein and D. Fouchez and B. Racine and C. Ravoux and B. Sanchez and G. Dimitriadis and A. Goobar and J. Johansson and J. Nordin and M. Rigault and M. Smith and M. Amenouche and M. Aubert and C. Barjou-Delayre and U. Burgaz and {D{\^a}{\^A}€{\^A}{\texttrademark} arcy Kenworthy}, W. and {De Jaeger}, T. and S. Dhawan and L. Galbany and M. Ginolin and D. Kuhn and M. Kowalski and T.E. M{\"u}ller-Bravo and P.E. Nugent and B. Popovic and P. Rosnet and F. Ruppin and J. Sollerman and J.H. Terwel and A. Townsend and S.L. Groom and S.R. Kulkarni and J. Purdum and B. Rusholme and N. Sravan",
year = "2025",
month = feb,
day = "28",
doi = "10.1051/0004-6361/202450389",
language = "English",
volume = "694",
journal = "Astronomy and Astrophysics",
issn = "1432-0746",
publisher = "EDP Sciences",

}

RIS

TY - JOUR

T1 - ZTF SN Ia DR2

T2 - Peculiar velocities' impact on the Hubble diagram

AU - Carreres, B.

AU - Rosselli, D.

AU - Bautista, J.E.

AU - Feinstein, F.

AU - Fouchez, D.

AU - Racine, B.

AU - Ravoux, C.

AU - Sanchez, B.

AU - Dimitriadis, G.

AU - Goobar, A.

AU - Johansson, J.

AU - Nordin, J.

AU - Rigault, M.

AU - Smith, M.

AU - Amenouche, M.

AU - Aubert, M.

AU - Barjou-Delayre, C.

AU - Burgaz, U.

AU - D’ arcy Kenworthy, W.

AU - De Jaeger, T.

AU - Dhawan, S.

AU - Galbany, L.

AU - Ginolin, M.

AU - Kuhn, D.

AU - Kowalski, M.

AU - Müller-Bravo, T.E.

AU - Nugent, P.E.

AU - Popovic, B.

AU - Rosnet, P.

AU - Ruppin, F.

AU - Sollerman, J.

AU - Terwel, J.H.

AU - Townsend, A.

AU - Groom, S.L.

AU - Kulkarni, S.R.

AU - Purdum, J.

AU - Rusholme, B.

AU - Sravan, N.

PY - 2025/2/28

Y1 - 2025/2/28

N2 - Type Ia supernovae (SNe Ia) are used to determine the distance-redshift relation and build the Hubble diagram. Neglecting their host-galaxy peculiar velocities (PVs) may bias the measurement of cosmological parameters. The smaller the redshift, the larger the e_ect is. We used realistic simulations of SNe Ia observed by the Zwicky Transient Facility (ZTF) to investigate the effect of different methods of taking PVs into account. We studied the impact of neglecting galaxy PVs and their correlations in an analysis of the SNe Ia Hubble diagram. We find that it is necessary to use the PV full covariance matrix computed from the velocity power spectrum to take the sample variance into account. Considering the results we have obtained using simulations, we determine the PV systematic e_ects in the context of the ZTF SN Ia DR2 sample. We determine the PV impact on the intercept of the Hubble diagram, aB, which is directly linked to the measurement of H0. We show that not taking into account PVs and their correlations results in a shift in the H0 value of about 1.0 km s -1 Mpc -1 and a slight underestimation of the H0 error bar.

AB - Type Ia supernovae (SNe Ia) are used to determine the distance-redshift relation and build the Hubble diagram. Neglecting their host-galaxy peculiar velocities (PVs) may bias the measurement of cosmological parameters. The smaller the redshift, the larger the e_ect is. We used realistic simulations of SNe Ia observed by the Zwicky Transient Facility (ZTF) to investigate the effect of different methods of taking PVs into account. We studied the impact of neglecting galaxy PVs and their correlations in an analysis of the SNe Ia Hubble diagram. We find that it is necessary to use the PV full covariance matrix computed from the velocity power spectrum to take the sample variance into account. Considering the results we have obtained using simulations, we determine the PV systematic e_ects in the context of the ZTF SN Ia DR2 sample. We determine the PV impact on the intercept of the Hubble diagram, aB, which is directly linked to the measurement of H0. We show that not taking into account PVs and their correlations results in a shift in the H0 value of about 1.0 km s -1 Mpc -1 and a slight underestimation of the H0 error bar.

U2 - 10.1051/0004-6361/202450389

DO - 10.1051/0004-6361/202450389

M3 - Journal article

VL - 694

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 1432-0746

M1 - A8

ER -