Mathematics – Logic
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phdt.........3r&link_type=abstract
Thesis (PH.D.)--HARVARD UNIVERSITY, 1996.Source: Dissertation Abstracts International, Volume: 57-05, Section: B, page: 3252.
Mathematics
Logic
15
Cosmology, Dust
Scientific paper
We present an empirical method to measure precise distances from type Ia supernova (SN Ia) light curves and apply it to measure cosmological parameters. We begin by developing the Light Curve Shape (LCS) method which measures the luminosity independently from the distance using SN Ia visual band light curves. The correlation between the light curve and luminosity is derived from a "training set" of nearby SN Ia with independent distance estimates and applied to a distant set of 13 SN Ia light curves. The LCS method reduces the dispersion of the standard candle method from 0.50 mag to 0.21 mag and using the light curve of SN 1972E and the Cepheid distance to NGC 5253 gives 67 +/- 7 km s ^{-1} Mpc^{ -1} for the Hubble constant. We measure the motion of the Galaxy with respect to these 13 distant galaxies. This solution is consistent with the rest frame of the cosmic microwave background and inconsistent with the velocity observed by Lauer and Postman. We extend the LCS method to use multicolor light curve shapes (MLCS) to distinguish between SN Ia which are distant, intrinsically dim, or obscured by dust. The natural history of SN Ia is that intrinsically dim SN Ia rise and fall more rapidly in the visual band and are redder before day thirty-five than intrinsically bright SN Ia. After day thirty-five, all SN Ia colors are more uniform. The MLCS method gives a dispersion of 0.12 mag for 20 distant SN Ia, a Hubble constant of 64 +/- 6 km s^{-1} Mpc ^{-1}, and the most precise confirmation of the linearity of the Hubble law. Using the MLCS method, we find the ratios of selective to total absorption from dust in distant galaxies hosting SN Ia to be consistent until the galactic extinction law. This result is a departure from previous investigations. The relation between host galaxy absorption and galaxy morphology is consistent with late-type galaxies being dust rich and early-type galaxies being dust poor, and suggests that SN Ia extinction is from interstellar dust. Finally, we present precise B,V,R, and I photometry of nine distant SN Ia light curves.
No associations
LandOfFree
Type IA Supernova Multicolor Light Curve Shapes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Type IA Supernova Multicolor Light Curve Shapes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Type IA Supernova Multicolor Light Curve Shapes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1129268