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An improved method for statistical studies of the internal kinematics of H ii regions: the case of M83
Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Faculty of Science, Department of Physics, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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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
Abstract [en]

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.
Keyword [en]
instrumentation: interferometers, methods: data analysis, H ii regions, galaxies: individual: M83, NGC 5236, galaxies: stellar content
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-50317DOI: 10.1111/j.1365-2966.2010.17078.xISI: 000281948100037OAI: diva2:380749
authorCount :11Available from: 2010-12-22 Created: 2010-12-22 Last updated: 2012-05-15Bibliographically approved
In thesis
1. Where stars are born: Kinematics and photometry of starburst and postburst galaxies
Open this publication in new window or tab >>Where stars are born: Kinematics and photometry of starburst and postburst galaxies
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The understanding of the formation and evolution of galaxies will not be complete until we understand the physical processes that trigger and regulate starformation in them. This work is about star formation on several size scales. It includes the kinematic study of 157 H II regions in the spiral galaxy M83, in order to test the relation, if any, between luminosity (L) and velocity dispersion(s), indicative of virialization. We found that there is no strong correlation between the mentioned variables, but only an upper envelope with a maximum luminosity for a given velocity dispersion. We demonstrated that this envelope has a slope that is strongly dependent on an accurate correction of instrumental broadening. Using our experience in H II regions, we moved to star formation at larger scales. Thus, the bulk of this thesis is on starburst galaxies and their evolutionary descendants, the postburst galaxies. A starburst is a galaxy that is suddenly creating large amounts of stars, at a rate that is not sustainable for long periods.We performed a kinematic study of a sample of 11 such objects, showing that they are, in general, not supported by rotation and that many of them are consistent with a recent merger which affected their morphology and kinematics.Furthermore, from Sloan Digital Sky Survey (SDSS) we extracted a robust sample of 1006 starbursts and 240 postbursts at redshift 0.010<z<0.083. We performed a comparative study of their structural parameters, such as effective radius, sersic index, asymmetry and absolute magnitude. We have found that the majority of starbursts and postbursts in the nearby Universe are disky galaxies, with a tendency for starbursts to have shorter effective radii and larger asymmetries.

Place, publisher, year, edition, pages
Department of Astronomy, Stockholm University, 2012. 66 p.
National Category
Astronomy, Astrophysics and Cosmology
Research subject
urn:nbn:se:su:diva-76454 (URN)978-91-7447-531-9 (ISBN)
Public defence
2012-06-13, sal FB52, AlbaNova universitetscentrum, Roslagstullsbacken 21, Stockholm, 14:00 (English)
At the time of the doctoral defence the following papers were unpublished and had a status as follows: Paper 2: Manuscript; Paper 3: Manuscript.Available from: 2012-05-22 Created: 2012-05-14 Last updated: 2012-05-15Bibliographically approved

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Blasco-Herrera, JavierFathi, KambizÖstlin, Göran
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