rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: High-velocity features of calcium and silicon in the spectra of Type Ia supernovae
  name:
    name part: Silverman Jeffrey M.
    role:
      role term: creator
  name:
    name part: Vinkó József
    role:
      role term: aut
  name:
    name part: Marion G H George Howie
    role:
      role term: aut
  name:
    name part: Wheeler Craig J.
    role:
      role term: aut
  name:
    name part: Barna Barnabás
    role:
      role term: aut
  name:
    name part: Szalai Tamás
    role:
      role term: aut
  name:
    name part: Mulligan Brian W.
    role:
      role term: aut
  name:
    name part: Filippenko Alexei V.
    role:
      role term: aut
  type of resource: text
  origin info:
    place:
      place term: hu
    date issued: 2015
    issuance: continuing
  language:
    language term: zxx
  physical description:
    form: elektronikus dokumentum
    extent: 1973-2014
  abstract: `High-velocity features' (HVFs) are spectral features in Type Ia supernovae (SNe Ia) that have minima indicating significantly higher (by greater than about 6000 km s-1) velocities than typical `photospheric-velocity features' (PVFs). The PVFs are absorption features with minima indicating typical photospheric (i.e. bulk ejecta) velocities (usually ˜9000-15 000 km s-1 near B-band maximum brightness). In this work, we undertake the most in-depth study of HVFs ever performed. The data set used herein consists of 445 low-resolution optical and near-infrared (NIR) spectra (at epochs up to 5 d past maximum brightness) of 210 low-redshift SNe Ia that follow the `Phillips relation'. A series of Gaussian functions is fit to the data in order to characterize possible HVFs of Ca II H&K, Si II λ6355, and the Ca II NIR triplet. The temporal evolution of the velocities and strengths of the PVFs and HVFs of these three spectral features is investigated, as are possible correlations with other SN Ia observables. We find that while HVFs of Ca II are regularly observed (except in underluminous SNe Ia, where they are never found), HVFs of Si II λ6355 are significantly rarer, and they tend to exist at the earliest epochs and mostly in objects with large photospheric velocities. It is also shown that stronger HVFs of Si II λ6355 are found in objects that lack C II absorption at early times and that have red ultraviolet/optical colours near maximum brightness. These results lead to a self-consistent connection between the presence and strength of HVFs of Si II λ6355 and many other mutually correlated SN Ia observables, including photospheric velocity.
  note: Silverman Jeffrey M.
  related item:
    title info:
      title: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 451
  identifier: 0035-8711
  identifier: http://publicatio.bibl.u-szeged.hu/7825/1/1502.07278v2.pdf
  record info:
    record content source: SZTE Publicatio Repozitórium
    record creation date: 160830
    record change date: 20190729151801.0
    record identifier: publ7825
    language of cataloging:
      language term: hun