Mathematics – Logic
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5502r&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #55.02; Bulletin of the American Astronomical Society, Vol. 31, p.1457
Mathematics
Logic
Scientific paper
We have measured the rest-frame B,V, and I-band light curves of a high-redshift type Ia supernova (SN Ia), SN 1999Q (z=0.46), using HST and ground-based near-IR detectors. A goal of this study is the measurement of the color excess, EB-I, which is a sensitive indicator of interstellar or intergalactic dust which could affect recent cosmological measurements from high-redshift SNe Ia. Our observations are moderately inconsistent with enough reddening by either Galactic-type or gray (size > 0.1 \ μ m) dust to reconcile the observations of high-redshift SNe Ia with Ω Λ =0 and q0 >= 0. The observed I-band light curve shows the secondary maximum typical of nearby SNe Ia of normal luminosity, providing no obvious indication of evolution as a function of redshift out to z 0.5. An expanded set of similar observations could yield the strongest constraints on challenges to indications from SNe Ia that the expansion of the Universe is accelerating.
High-Z Supernova Team
Riess Adam G.
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