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Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies

Fuente: arXiv

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Bibliographic Details
Main Authors:	Toy, M., Wiseman, P., Sullivan, M., Scolnic, D., Vincenzi, M., Brout, D., Davis, T. M., Frohmaier, C., Galbany, L., Lidman, C., Lee, J., Kelsey, L., Kessler, R., Möller, A., Popovic, B., Sánchez, B. O., Shah, P., Smith, M., Allam, S., Aguena, M., Alves, O., Bacon, D., Brooks, D., Burke, D. L., Rosell, A. Carnero, Carretero, J., da Costa, L. N., Pereira, M. E. S., Desai, S., Diehl, H. T., Doel, P., Drlica-Wagner, A., Everett, S., Ferrero, I., Flaugher, B., Frieman, J., García-Bellido, J., Gatti, M., Gaztanaga, E., Giannini, G., Gruendl, R. A., Gutierrez, G., Hinton, S. R., Hollowood, D. L., Honscheid, K., James, D. J., Lahav, O., Lee, S., Marshall, J. L., Mena-Fernández, J., Miquel, R., Palmese, A., Pieres, A., Malagón, A. A. Plazas, Romer, A. K., Samuroff, S., Sanchez, E., Cid, D. Sanchez, Schubnell, M., Suchyta, E., Swanson, M. E. C., Tarle, G., Tucker, D. L., Vikram, V., Walker, A. R., Weaverdyck, N.
Format:	Preprint
Published:	2024
Subjects:	Cosmology and Nongalactic Astrophysics
Online Access:	Acceder al recurso
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author	Toy, M. Wiseman, P. Sullivan, M. Scolnic, D. Vincenzi, M. Brout, D. Davis, T. M. Frohmaier, C. Galbany, L. Lidman, C. Lee, J. Kelsey, L. Kessler, R. Möller, A. Popovic, B. Sánchez, B. O. Shah, P. Smith, M. Allam, S. Aguena, M. Alves, O. Bacon, D. Brooks, D. Burke, D. L. Rosell, A. Carnero Carretero, J. da Costa, L. N. Pereira, M. E. S. Desai, S. Diehl, H. T. Doel, P. Drlica-Wagner, A. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gatti, M. Gaztanaga, E. Giannini, G. Gruendl, R. A. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. James, D. J. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernández, J. Miquel, R. Palmese, A. Pieres, A. Malagón, A. A. Plazas Romer, A. K. Samuroff, S. Sanchez, E. Cid, D. Sanchez Schubnell, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Tucker, D. L. Vikram, V. Walker, A. R. Weaverdyck, N.
author_facet	Toy, M. Wiseman, P. Sullivan, M. Scolnic, D. Vincenzi, M. Brout, D. Davis, T. M. Frohmaier, C. Galbany, L. Lidman, C. Lee, J. Kelsey, L. Kessler, R. Möller, A. Popovic, B. Sánchez, B. O. Shah, P. Smith, M. Allam, S. Aguena, M. Alves, O. Bacon, D. Brooks, D. Burke, D. L. Rosell, A. Carnero Carretero, J. da Costa, L. N. Pereira, M. E. S. Desai, S. Diehl, H. T. Doel, P. Drlica-Wagner, A. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gatti, M. Gaztanaga, E. Giannini, G. Gruendl, R. A. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. James, D. J. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernández, J. Miquel, R. Palmese, A. Pieres, A. Malagón, A. A. Plazas Romer, A. K. Samuroff, S. Sanchez, E. Cid, D. Sanchez Schubnell, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Tucker, D. L. Vikram, V. Walker, A. R. Weaverdyck, N.
contents	Using 1533 type Ia supernovae (SNe Ia) from the five-year sample of the Dark Energy Survey (DES), we investigate the relationship between the projected galactocentric separation of the SNe and their host galaxies and their light curves and standardization. We show, for the first time, that the difference in SN Ia post-standardization brightnesses between high and low-mass hosts reduces from $0.078\pm0.011$\,mag in the full sample to $0.036 \pm 0.018$\,mag for SNe Ia located in the outer regions of their host galaxies, while increasing to $0.100 \pm 0.014$\,mag for SNe in the inner regions. The difference in the size of the mass step between inner and outer regions is $0.064\pm0.023$\,mag. In these inner regions, the step can be reduced (but not removed) using a model where the $R_V$ of dust along the line-of-sight to the SN changes as a function of galaxy properties. We investigate the remaining difference using the distributions of the SN Ia stretch parameter to test the inferred age of SN progenitors. Comparing red (older) environments only, outer regions have a higher proportion of high-stretch SNe and a more homogeneous stretch distribution. However, this effect cannot explain the reduction in significance of any Hubble residual step in outer regions. We conclude that the standardized distances of SNe Ia located in the outer regions of galaxies are less affected by their global host galaxy properties than those in the inner regions.
format	Preprint
id	arxiv_https___arxiv_org_abs_2408_03749
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies Toy, M. Wiseman, P. Sullivan, M. Scolnic, D. Vincenzi, M. Brout, D. Davis, T. M. Frohmaier, C. Galbany, L. Lidman, C. Lee, J. Kelsey, L. Kessler, R. Möller, A. Popovic, B. Sánchez, B. O. Shah, P. Smith, M. Allam, S. Aguena, M. Alves, O. Bacon, D. Brooks, D. Burke, D. L. Rosell, A. Carnero Carretero, J. da Costa, L. N. Pereira, M. E. S. Desai, S. Diehl, H. T. Doel, P. Drlica-Wagner, A. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gatti, M. Gaztanaga, E. Giannini, G. Gruendl, R. A. Gutierrez, G. Hinton, S. R. Hollowood, D. L. Honscheid, K. James, D. J. Lahav, O. Lee, S. Marshall, J. L. Mena-Fernández, J. Miquel, R. Palmese, A. Pieres, A. Malagón, A. A. Plazas Romer, A. K. Samuroff, S. Sanchez, E. Cid, D. Sanchez Schubnell, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Tucker, D. L. Vikram, V. Walker, A. R. Weaverdyck, N. Cosmology and Nongalactic Astrophysics Using 1533 type Ia supernovae (SNe Ia) from the five-year sample of the Dark Energy Survey (DES), we investigate the relationship between the projected galactocentric separation of the SNe and their host galaxies and their light curves and standardization. We show, for the first time, that the difference in SN Ia post-standardization brightnesses between high and low-mass hosts reduces from $0.078\pm0.011$\,mag in the full sample to $0.036 \pm 0.018$\,mag for SNe Ia located in the outer regions of their host galaxies, while increasing to $0.100 \pm 0.014$\,mag for SNe in the inner regions. The difference in the size of the mass step between inner and outer regions is $0.064\pm0.023$\,mag. In these inner regions, the step can be reduced (but not removed) using a model where the $R_V$ of dust along the line-of-sight to the SN changes as a function of galaxy properties. We investigate the remaining difference using the distributions of the SN Ia stretch parameter to test the inferred age of SN progenitors. Comparing red (older) environments only, outer regions have a higher proportion of high-stretch SNe and a more homogeneous stretch distribution. However, this effect cannot explain the reduction in significance of any Hubble residual step in outer regions. We conclude that the standardized distances of SNe Ia located in the outer regions of galaxies are less affected by their global host galaxy properties than those in the inner regions.
title	Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2408.03749