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Nebular spectroscopy of dwarf irregular galaxies in nearby groups
2005 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A number of dwarf irregular galaxies have been selected in the three most nearby groups of galaxies: the M81, Centaurus A, and Sculptor groups. The final objective is to establish whether there is a relationship between the luminosity and the fraction of oxygen contained in dwarf irregular galaxies and for that homogeneous oxygen abundances and near-IR luminosities are being collected. By comparison of observations from different groups at considerably different interaction rates we are hoping to clear up the debated luminosity-metallicity assumption for the case of dwarf irregular galaxies. We have reduced, measured and analysed optical spectra of HII regions of five dwarf irregular galaxies in the Sculptor group. Fluxes are measured and corrected from reddening and electron temperatures and homogeneous chemical abundances are obtained. The oxygen abundances normalised to hydrogen are estimated with calculations that ranges between 2×10-5 and 33×10-5. The empirical method based on R23 is also applied. We are now presenting the results for the Sculptor group.

Place, publisher, year, edition, pages
Keyword [en]
Physics Chemistry Maths, Astrofysik, astronomi
Keyword [sv]
Fysik, Kemi, Matematik
URN: urn:nbn:se:ltu:diva-46365ISRN: LTU-EX--05/324--SELocal ID: 3ff1a9f0-d675-497d-b1f5-9b585977479eOAI: diva2:1019679
Subject / course
Student thesis, at least 30 credits
Educational program
Space Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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