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The distances to five Type II supernovae using the expanding photosphere method, and the value of H0
Schmidt, Brian P.; Kirshner, Robert P.; Eastman, Ronald G.; Phillips, Mark M.; Suntzeff, Nicholas B.; Hamuy, Mario; Maza, Jose; Aviles, Roberto
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, US), AC(Lick Observatory, California Univ., Santa Cruz, CA, US), AD(Lick Observatory, California Univ., Santa Cruz, CA, US), AE(Cerro Tololo Inter-American Observatory, La Serena, Chile), AF(Cerro Tololo Inter-American Observatory, La Serena, Chile), AG(Universidad de Chile, Santiago, Chile), AH(Universidad de Chile, Santiago, Chile)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 1, p. 42-48 (ApJ Homepage)
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NASA/STI Keywords:
Cosmology, Distance, Galaxies, Hubble Constant, Photosphere, Supernovae, Galactic Evolution, Radial Velocity, Red Shift, Stellar Evolution
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We have used observations gathered at Cerro Tololo Inter-American Observatory (CTIO) to measure distances by the expanding photosphere method (EPM) to five Type II supernovae. These supernovae lie at redshifts from cz = 1100 km/s to cz = 5500 km/s, and increase to 18 the number of distances measured using EPM. We compare distances derived to 11 Type II supernovae with distances to their galaxies measured using the Tully-Fisher method. We find that the Tully-Fisher distances average 11% +/- 7% smaller. The comparison shows no significant evidence of any large distance-dependent bias in the Tully-Fisher distances. We employ the sample of EPM distances from 4.5 Mpc to 180 Mpc to derive a value for the Hubble constant. We find H0 = 73 +/- 6 (statistical) +/- 7 (systematic) km/s/Mpc.

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