For refcode 2006ApJ...642L..29N: Retrieve 8 NED objects in this reference. Please click here for ADS abstract
NED Abstract
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2006ApJ...642L..29N
The Hubble Constant from Type Ia Supernovae Calibrated with the Linear and
Nonlinear Cepheid PeriodLuminosity Relations
C. Ngeow and S. M. Kanbur
Abstract. It is well known that the peak brightness of Type Ia
supernovae calibrated with Cepheid distances can be used to determine
the Hubble constant. The Cepheid distances to the host galaxies of the
calibrating supernovae are usually obtained using the periodluminosity
(PL) relation derived from Large Magellanic Cloud (LMC) Cepheids.
However, recent empirical studies provide evidence that the LMC PL
relation is not linear. Here we determine the Hubble constant using both
the linear and nonlinear LMC Cepheid PL relations as calibrating
relations to four galaxies that hosted Type Ia supernovae. Our results
suggest that the obtained values of the Hubble constant are similar.
However, a typical error of ~0.03 mag has to be added (in quadrature) to
the systematic error for the Hubble constant when the linear LMC PL
relation is used, assuming that the LMC PL relation is indeed
nonlinear. This is important to minimize the total error on the Hubble
constant in the era of precision cosmology. The Hubble constants
calibrated from the linear and nonlinear LMC PL relations are
H_0_=74.92+/2.28 (random)+/5.06(systematic) km s^1^ Mpc^1^ and
H_0_=74.37+/2.27(random)+/4.92(systematic) km s^1^ Mpc^1^,
respectively. Hubble constants calculated using the Galactic PL
relation are also presented and briefly discussed.
Key words: Stars: Variables: Cepheids, Cosmology: Distance Scale,
Galaxies: Distances and Redshifts
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