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1999•Symposium - International Astronomical UnionOpen access

The Cosmological Parameters H0 and Ω0

R. Brent Tully

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Abstract

The first section discusses a recalibration of the luminosity–linewidth technique and its use in a determination of H0. The recalibration introduces (i) new cluster calibration data, (ii) new corrections for reddening as a function of inclination, and (iii) a new zero-point calibration using 13 galaxies with distances determined via the cepheid period–luminosity method. It is found that H0 = 82 ± 16 km s−1 Mpc−1 (95% confidence).

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What this paper is about

The first section discusses a recalibration of the luminosity–linewidth technique and its use in a determination of H0. The recalibration introduces (i) new cluster calibration data, (ii) new corrections for reddening as a function of inclination, and (iii) a new zero-point calibration using 13 galaxies with distances determined via the cepheid period–luminosity method. It is found that H0 = 82 ± 16 km s−1 Mpc−1 (95% confidence).

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Available abstract

The first section discusses a recalibration of the luminosity–linewidth technique and its use in a determination of H0. The recalibration introduces (i) new cluster calibration data, (ii) new corrections for reddening as a function of inclination, and (iii) a new zero-point calibration using 13 galaxies with distances determined via the cepheid period–luminosity method. It is found that H0 = 82 ± 16 km s−1 Mpc−1 (95% confidence).

Key concepts: Cepheid variable, Physics, Astrophysics, Luminosity, Galaxy, Calibration, Luminosity function, Cluster (spacecraft)

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