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

Fuente: arXiv

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Main Authors:	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., Kenworthy, W. D'Arcy, De Jaeger, T., Dhawan, S., Galbany, L., Ginolin, M., Kuhn, D., Kowalski, M., Müller-Bravo, T. E., Nugent, P. E., Popovic, B., Rosnet, P., Ruppin, F., Sollerman, J., Terwel, J. H., Townsend, A., Groom, S. L., Kulkarni, S. R., Purdum, J., Rusholme, B., Sravan, N.
Format:	Preprint
Published:	2024
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	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. Kenworthy, W. D'Arcy De Jaeger, T. Dhawan, S. Galbany, L. Ginolin, M. Kuhn, D. Kowalski, M. Müller-Bravo, T. E. Nugent, P. E. Popovic, B. Rosnet, P. Ruppin, F. Sollerman, J. Terwel, J. H. Townsend, A. Groom, S. L. Kulkarni, S. R. Purdum, J. Rusholme, B. Sravan, N.
author_facet	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. Kenworthy, W. D'Arcy De Jaeger, T. Dhawan, S. Galbany, L. Ginolin, M. Kuhn, D. Kowalski, M. Müller-Bravo, T. E. Nugent, P. E. Popovic, B. Rosnet, P. Ruppin, F. Sollerman, J. Terwel, J. H. Townsend, A. Groom, S. L. Kulkarni, S. R. Purdum, J. Rusholme, B. Sravan, N.
contents	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 effect is. We use realistic simulations of SNe Ia observed by the Zwicky Transient Facility (ZTF) to investigate the effect of different methods to take into account PVs. We study 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 into account the sample variance. Considering the results we have obtained using simulations, we determine the PV systematic effects in the context of the ZTF DR2 SNe Ia sample. We determine the PV impact on the intercept of the Hubble diagram, $a_B$, which is directly linked to the measurement of $H_0$. We show that not taking into account PVs and their correlations results in a shift of the $H_0$ value of about $1.0$km.s$^{-1}$.Mpc$^{-1}$ and a slight underestimation of the $H_0$ error bar.
format	Preprint
id	arxiv_https___arxiv_org_abs_2405_20409
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	ZTF SN Ia DR2: Peculiar velocities impact on the Hubble diagram 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. Kenworthy, W. D'Arcy De Jaeger, T. Dhawan, S. Galbany, L. Ginolin, M. Kuhn, D. Kowalski, M. Müller-Bravo, T. E. Nugent, P. E. Popovic, B. Rosnet, P. Ruppin, F. Sollerman, J. Terwel, J. H. Townsend, A. Groom, S. L. Kulkarni, S. R. Purdum, J. Rusholme, B. Sravan, N. Cosmology and Nongalactic Astrophysics 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 effect is. We use realistic simulations of SNe Ia observed by the Zwicky Transient Facility (ZTF) to investigate the effect of different methods to take into account PVs. We study 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 into account the sample variance. Considering the results we have obtained using simulations, we determine the PV systematic effects in the context of the ZTF DR2 SNe Ia sample. We determine the PV impact on the intercept of the Hubble diagram, $a_B$, which is directly linked to the measurement of $H_0$. We show that not taking into account PVs and their correlations results in a shift of the $H_0$ value of about $1.0$km.s$^{-1}$.Mpc$^{-1}$ and a slight underestimation of the $H_0$ error bar.
title	ZTF SN Ia DR2: Peculiar velocities impact on the Hubble diagram
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2405.20409