The Linearity of the Cosmic Expansion Field and the Value of the Hubble Constant
نویسنده
چکیده
A linearity test showsH0 to decrease by 7% out to 18 000 km s −1. The value at 10 000 km s−1 is a good approximation to the mean value of H0 over very large scales. The construction of the extragalactic distance scale is discussed. Field galaxies, cluster distances relative to Virgo, and blue supernovae of type Ia yield H0 (cosmic) with increasing weight; they give consistently H0 = 57 ± 7 (external error). This value is supported by purely physical distance determinations (SZ effect, gravitational lenses, MWB fluctuations). Arguments for H0 > 70 are discussed and shown to be flawed.
منابع مشابه
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Four Hubble diagrams are combined to test for the linearity of the cosmic expansion field. The expansion rate, H0, is found to decrease by ∼ 5% out to 18 000 km s. Beyond this distance the mean value of H0 is close to the value at 10 000 km s. The absolute value of H0 is derived in two different ways. The one leads through Cepheids from HST and blue SNe Ia to H0 = 57± 7 (external error) at 30 0...
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تاریخ انتشار 1998