Calibration of the Fundamental Plane Zero-point in the Leo-I Group and an Estimate of the Hubble Constant

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dc.creatorHjorth, Jens
dc.creatorTanvir, Nial R.
dc.date1997-01-07
dc.date.accessioned2026-07-07T02:22:39Z
dc.date.available2026-07-07T02:22:39Z
dc.descriptionWe derive new effective radii and total magnitudes for 5 E and S0 galaxies in the Leo-I group from wide-field CCD images. These are used in conjunction with recent literature velocity data to construct the fundamental plane (FP) of the Leo-I group. The rms scatter that we find is only 6 % in distance. The zero point of this relation provides a calibration of the FP as a distance indicator and directly determines the angular diameter distance ratio between the Leo-I group and more distant clusters. In the language of Jerjen and Tammann (1993) we determine a cosmic velocity of the Leo-I group of 757+-68 km/s relative to the Coma cluster, or 796+-57 km/s relative to a frame of 9 clusters. Combining this velocity with the Cepheid distance to M96, a member of Leo-I, we find the Hubble constant to be H_0=67+-8 km/s/Mpc or H_0=70+-7 km/s/Mpc for each case. The distance we obtain for the Coma cluster itself (108+-12 Mpc) is in good agreement with a number of other recent estimates.
dc.description19 pages, LaTeX, includes aaspp4.sty and 3 eps figures. To appear in ApJ. Also available at http://www.nordita.dk/~jens/preprints.html
dc.identifierhttps://arxiv.org/abs/astro-ph/9701025
dc.identifierhttp://arxiv.org/abs/astro-ph/9701025
dc.identifierAstrophys.J. 482 (1997) 68-74
dc.identifierdoi:10.1086/304124
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10956
dc.subjectAstrophysics
dc.titleCalibration of the Fundamental Plane Zero-point in the Leo-I Group and an Estimate of the Hubble Constant
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