COSMICFLOWS-2: TYPE Ia SUPERNOVA CALIBRATION AND H{sub 0}

Journal Article · Fri Apr 20 04:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/749/2/174· OSTI ID:22020356

Courtois, Helene M ^[1]; Tully, R Brent ^[2]

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1. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
2. Universite Claude Bernard Lyon 1, Institut de Physique Nucleaire, Lyon (France)

The construction of the Cosmicflows-2 compendium of distances involves the merging of distance measures contributed by the following methods: (Cepheid) period-luminosity, tip of the red giant branch (TRGB), surface brightness fluctuation (SBF), luminosity-linewidth (TF), fundamental plane (FP), and Type Ia supernova (SNIa). The method involving SNIa is at the top of an interconnected ladder, providing accurate distances to well beyond the expected range of distortions to Hubble flow from peculiar motions. In this paper, the SNIa scale is anchored by 36 TF spirals with Cepheid or TRGB distances, 56 SNIa hosts with TF distances, and 61 groups or clusters hosting SNIa with Cepheid, SBF, TF, or FP distances. With the SNIa scale zero-point set, a value of the Hubble constant is evaluated over a range of redshifts 0.03 < z < 0.5, assuming a cosmological model with {Omega}{sub m} = 0.27 and {Omega}{sub {Lambda}} = 0.73. The value determined for the Hubble constant is H{sub 0} = 75.9 {+-} 3.8 km s{sup -1} Mpc{sup -1}.

• OSTI ID: 22020356
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 749; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
BRIGHTNESS
CALIBRATION
COSMOLOGICAL MODELS
GALAXIES
LUMINOSITY
RED SHIFT