Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8177s&link_type=abstract
HST Proposal ID #8177
Computer Science
Hst Proposal Id #8177 Clusters Of Galaxies And Lensing
Scientific paper
The results from the high-z supernova groups that the Universe is accelerating rests entirely on the observation that the distant SN Ia are 0.25 magnitudes fainter than expected for an empty Universe. While both groups have argued that this magnitude offset is not due to quantifiable systematic effects, it is critical to test this assumption in new ways. We propose to use WFPC2 to obtain rest frame U and B photometry for four z~ 0.85 SN Ia. These observations will be coupled to ground-based rest frame V photometry and spectra. These data, combined with previous samples, will extend the D_L vs. z diagram for SN Ia to z~0.85, and allow us to discriminate the redshift dependence of supernova apparent magnitudes in an accelerating Universe from that expected to result from systematic effects such as age of the stellar population, chemical evolution, a drift in the properties of dust, and weak gravitational lensing. Evolution of SN Ia is a primary concern and it is only by careful object by object comparison that subtle effects will be apparent. We therefore also propose to use WFPC2 to obtain rest frame B and V photometry for four z~ 0.5 SN Ia. These data will be combined with extensive Keck spectra and rest frame U and R photometry obtained from the ground. The four z~ 0.5 objects will have light curves and spectra of comparable quality to nearby SN Ia, and will provide a basis for a detailed comparison.
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