Journal Article

An improved method for statistical studies of the internal kinematics of H <span class="smallCaps">ii</span> regions: the case of M83

J. Blasco-Herrera, K. Fathi, J. Beckman, L. Gutiérrez, A. Lundgren, B. Epinat, G. Östlin, J. Font, O. Hernandez, M.-M. de Denus-Baillargeon and C. Carignan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 4, pages 2519-2529
Published in print October 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17078.x
An improved method for statistical studies of the internal kinematics of H ii regions: the case of M83

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We present the integrated Hα emission line profile for 157 H ii regions in the central 3.4 × 3.4 arcmin2 of the galaxy M83 (NGC 5236). Using the Fabry–Perot interferometer GHαFaS, on the 4.2-m William Herschel Telescope on La Palma, we show the importance of a good characterization of the instrumental response function for the study of line profile shapes. The luminosity–velocity dispersion relation is also studied, and in the log(L)–log(σ) plane we do not find a linear relation, but an upper envelope with equation log(L) = 0.9 log(σ) + 38.1. For the adopted distance of 4.5 Mpc, the upper envelope appears at the luminosity L= 1038.5 erg s−1, in full agreement with previous studies of other galaxies, reinforcing the idea of using H ii regions as standard candles.

Keywords: instrumentation: interferometers; methods: data analysis; H ii regions; galaxies: individual: M83, NGC 5236; galaxies: stellar content

Journal Article.  7179 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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