Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432...42s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 1, p. 42-48
Astronomy and Astrophysics
Astrophysics
142
Cosmology, Distance, Galaxies, Hubble Constant, Photosphere, Supernovae, Galactic Evolution, Radial Velocity, Red Shift, Stellar Evolution
Scientific paper
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.
Aviles Roberto
Eastman Ronald G.
Hamuy Mario
Kirshner Robert P.
Maza Jose
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