Determining the Hubble constant using giant extragalactic Hii regions and Hii galaxies

We report the first results of a long-term programme aiming to provide accurate independent estimates of the Hubble constant (H0) using the L(H beta )- sigma distance estimator for giant extragalactic Hii regions (GEHR) and Hii galaxies. We have used Very Large Telescope and Subaru high-dispersion s...

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Published in:Monthly notices of the Royal Astronomical Society. Letters 2012-09, Vol.425 (1), p.L56-L60
Main Authors: Chavez, Ricardo, Terlevich, Elena, Terlevich, Roberto, Plionis, Manolis, Bresolin, Fabio, Basilakos, Spyros, Melnick, Jorge
Format: Article
Language:English
Subjects:
Anchors
Galaxies
Hubble constant
Indicators
Samples
Statistical analysis
Statistical methods
Supernovae
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container_title Monthly notices of the Royal Astronomical Society. Letters
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creator Chavez, Ricardo
Terlevich, Elena
Terlevich, Roberto
Plionis, Manolis
Bresolin, Fabio
Basilakos, Spyros
Melnick, Jorge
description We report the first results of a long-term programme aiming to provide accurate independent estimates of the Hubble constant (H0) using the L(H beta )- sigma distance estimator for giant extragalactic Hii regions (GEHR) and Hii galaxies. We have used Very Large Telescope and Subaru high-dispersion spectroscopic observations of a local sample of Hii galaxies, identified in the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) catalogue in order to redefine and improve the L(H beta )- sigma distance indicator and to determine the Hubble constant. To this end, we utilized as local calibration or 'anchor' of this correlation GEHR in nearby galaxies which have accurate distance measurements determined via primary indicators. Using our best sample of 69 nearby Hii galaxies and 23 GEHR in nine galaxies, we obtain H0= 74.3 plus or minus 3.1 (statistical) plus or minus 2.9 (systematic)kms-1Mpc-1, in excellent agreement with, and independently confirming, the most recent Type Ia supernovae based results.
doi_str_mv 10.1111/j.1745-3933.2012.01299.x
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subjects Anchors
Galaxies
Hubble constant
Indicators
Samples
Statistical analysis
Statistical methods
Supernovae
title Determining the Hubble constant using giant extragalactic Hii regions and Hii galaxies
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