Determining the Hubble constant using Giant extragalactic HII regions and HII galaxies

2); (2) Institute of Astronomy; 3); (3) Institute of Astronomy; (4) Institute for Astronomy; (5) Academy of Athens Research Center for Astronomy; 6); (6) High Energy Physics Group; (7) European Southern Observatory; Applied Mathematics

Determining the Hubble constant using Giant extragalactic HII regions and HII galaxies

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arxiv 1203.6222 v2 pith:OV33ZM5T submitted 2012-03-28 astro-ph.CO

Determining the Hubble constant using Giant extragalactic HII regions and HII galaxies

Ricardo Chavez (1) , Elena Terlevich (1) , Roberto Terlevich (1 , 2) , Manolis Plionis (1 , 3) , Fabio Bresolin (4) , Spyros Basilakos (5

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6) Jorge Melnick (7) ((1) Instituto Nacional de Astrofisica Optica y Electronica Tonantzintla Puebla Mexico (2) Institute of Astronomy Cambridge UK (3) Institute of Astronomy Astrophysics National Observatory of Athens Thessio Athens Greece (4) Institute for Astronomy University of Hawaii Honolulu Hawaii USA (5) Academy of Athens Research Center for Astronomy Applied Mathematics (6) High Energy Physics Group Dept. ECM Universitat de Barcelona Barcelona Spain (7) European Southern Observatory Santiago de Chile Chile)

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We report the first results of a long term program aiming to provide accurate independent estimates of the Hubble constant (H0) using the L-sigma distance estimator for Giant extragalactic HII regions (GEHR) and HII galaxies. We have used VLT and Subaru high dispersion spectroscopic observations of a local sample of HII galaxies, identified in the SDSS DR7 catalogue in order to re-define and improve the L(Hbeta)-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 9 galaxies we obtain H0=74.3 +- 3.1 (statistical) +- 2.9 (systematic) km /s Mpc, in excellent agreement with, and independently confirming, the most recent SNe Ia based results.

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