Supernovae and their host galaxies – VI. Normal Type Ia and 91bg-like supernovae in ellipticals
Abstract
ABSTRACT We present an analysis of the galactocentric distributions of the ‘normal’ and peculiar ‘91bg-like’ subclasses of 109 supernovae (SNe) Ia, and study the global parameters of their elliptical hosts. The galactocentric distributions of the SN subclasses are consistent with each other and with the radial light distribution of host stellar populations, when excluding bias against central SNe. Among the global parameters, only the distributions of u − r colours and ages are inconsistent significantly between the ellipticals of different SN Ia subclasses: the normal SN hosts are on average bluer/younger than those of 91bg-like SNe. In the colour–mass diagram, the tail of colour distribution of normal SN hosts stretches into the Green Valley – transitional state of galaxy evolution, while the same tail of 91bg-like SN hosts barely reaches that region. Therefore, the bluer/younger ellipticals might have more residual star formation that gives rise to younger ‘prompt’ progenitors, resulting in normal SNe Ia with shorter delay times. The redder and older ellipticals that already exhausted their gas for star formation may produce significantly less normal SNe with shorter delay times, outnumbered by ‘delayed’ 91bg-like events. The host ages (lower age limit of the delay times) of 91bg-like SNe does not extendmore »
- Authors:
-
[1];
[1];
[1];
[2];
- Byurakan Astrophysical Observatory, 0213 Byurakan, Aragatsotn Province, Armenia
- Institut d’Astrophysique de Paris, Sorbonne Universités, UPMC Univ Paris 6 et CNRS, UMR 7095, 98 bis bd Arago, F-75014 Paris, France
- Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal
- INAF – Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1581653
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 490 Journal Issue: 1; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Barkhudaryan, L. V., Hakobyan, A. A., Karapetyan, A. G., Mamon, G. A., Kunth, D., Adibekyan, V., and Turatto, M. Supernovae and their host galaxies – VI. Normal Type Ia and 91bg-like supernovae in ellipticals. United Kingdom: N. p., 2019.
Web. doi:10.1093/mnras/stz2585.
Barkhudaryan, L. V., Hakobyan, A. A., Karapetyan, A. G., Mamon, G. A., Kunth, D., Adibekyan, V., & Turatto, M. Supernovae and their host galaxies – VI. Normal Type Ia and 91bg-like supernovae in ellipticals. United Kingdom. https://doi.org/10.1093/mnras/stz2585
Barkhudaryan, L. V., Hakobyan, A. A., Karapetyan, A. G., Mamon, G. A., Kunth, D., Adibekyan, V., and Turatto, M. Mon .
"Supernovae and their host galaxies – VI. Normal Type Ia and 91bg-like supernovae in ellipticals". United Kingdom. https://doi.org/10.1093/mnras/stz2585.
@article{osti_1581653,
title = {Supernovae and their host galaxies – VI. Normal Type Ia and 91bg-like supernovae in ellipticals},
author = {Barkhudaryan, L. V. and Hakobyan, A. A. and Karapetyan, A. G. and Mamon, G. A. and Kunth, D. and Adibekyan, V. and Turatto, M.},
abstractNote = {ABSTRACT We present an analysis of the galactocentric distributions of the ‘normal’ and peculiar ‘91bg-like’ subclasses of 109 supernovae (SNe) Ia, and study the global parameters of their elliptical hosts. The galactocentric distributions of the SN subclasses are consistent with each other and with the radial light distribution of host stellar populations, when excluding bias against central SNe. Among the global parameters, only the distributions of u − r colours and ages are inconsistent significantly between the ellipticals of different SN Ia subclasses: the normal SN hosts are on average bluer/younger than those of 91bg-like SNe. In the colour–mass diagram, the tail of colour distribution of normal SN hosts stretches into the Green Valley – transitional state of galaxy evolution, while the same tail of 91bg-like SN hosts barely reaches that region. Therefore, the bluer/younger ellipticals might have more residual star formation that gives rise to younger ‘prompt’ progenitors, resulting in normal SNe Ia with shorter delay times. The redder and older ellipticals that already exhausted their gas for star formation may produce significantly less normal SNe with shorter delay times, outnumbered by ‘delayed’ 91bg-like events. The host ages (lower age limit of the delay times) of 91bg-like SNe does not extend down to the stellar ages that produce significant u-band fluxes – the 91bg-like events have no prompt progenitors. Our results favour SN Ia progenitor models such as He-ignited violent mergers that have the potential to explain the observed SN/host properties.},
doi = {10.1093/mnras/stz2585},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 490,
place = {United Kingdom},
year = {Mon Sep 16 00:00:00 EDT 2019},
month = {Mon Sep 16 00:00:00 EDT 2019}
}
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