Computer Science
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..428k&link_type=abstract
NOAO Proposal ID #2000B-0428
Computer Science
Scientific paper
The peak brightness measurements of Type Ia supernovae indicate that the Hubble expansion is in acceleration and has somehow overcome the expected deceleration due to gravity. Even though it fits nicely with the predictions from the theoretical cosmologists' favorite flat universe, this rather extraordinary claim needs rigorous observational testing . The chief alternative explanations are intergalactic dust absorption and intrinsic changes in the luminosity of distant supernovae due to evolutionary effects. This semester we are proposing to test the generic predictions of chemical composition models and the specific predictions of dust models through very wide wavelength coverage (restframe BVRI) and detailed high signal-to-noise spectra of 7 type Ia supernovae near z=0.5. A sample at z=0.5 is well suited to test both the dust and the evolution hypothesis while providing enough signal for a detailed spectral studies. This proposal asks for WIYN time to obtain follow-up photometry of the SN Ia discovered, allowing us to tie our HST photometry to ground-based observations, as well as to obtain lights curves of SN Ia which will not be observed by HST.
High-Z Supernova Search Team
Kirshner Robert P.
Schmidt Brian P.
Suntzeff Nicholas B.
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