Journal
ASTROPHYSICAL JOURNAL
Volume 734, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/734/1/42
Keywords
cosmology: observations; distance scale; dust, extinction; supernovae: general
Categories
Funding
- Spanish Ministry of Science and Innovation (MICINN) [CSD2007-00060]
- Alfred P. Sloan Foundation
- University of Chicago
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- University of Pittsburgh
- Princeton University
- United States Naval Observatory
- University of Washington
- National Aeronautics and Space Administration
- National Science Foundation
- U. S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- Swedish Research Council
- STFC [ST/I001204/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001204/1] Funding Source: researchfish
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We study the pseudo-equivalent width of the Si II lambda 4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 <= z <= 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si II lambda 6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si II lambda 4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia.
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