An improved method for statistical studies of the internal kinematics of H ii regions: the case of M83
2010 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 407, no 4, 2519-2529 p.Article in journal (Refereed) Published
We present the integrated H alpha emission line profile for 157 H ii regions in the central 3.4 x 3.4 arcmin2 of the galaxy M83 (NGC 5236). Using the Fabry-Perot interferometer GH alpha FaS, 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(Sigma) plane we do not find a linear relation, but an upper envelope with equation log(L-H alpha) = 0.9 log(Sigma) + 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.
Place, publisher, year, edition, pages
2010. Vol. 407, no 4, 2519-2529 p.
instrumentation: interferometers, methods: data analysis, H ii regions, galaxies: individual: M83, NGC 5236, galaxies: stellar content
IdentifiersURN: urn:nbn:se:su:diva-50317DOI: 10.1111/j.1365-2966.2010.17078.xISI: 000281948100037OAI: oai:DiVA.org:su-50317DiVA: diva2:380749
authorCount :112010-12-222010-12-222012-05-15Bibliographically approved