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An analysis of the UV properties and single stellar population parameters of a sample of early-type galaxies from SDSS and GALEX

Siegers, A. (2006) An analysis of the UV properties and single stellar population parameters of a sample of early-type galaxies from SDSS and GALEX. Master's Thesis / Essay, Astronomy.

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Abstract

Recent results from GALEX (Yi et al. 2005) suggest that » 15% of early type galaxies show evidence of recent (» 100 Myr) star formation. This is inferred from enhanced UV °uxes and blue (FUV-NUV) colours. We obtain spectra and UV colours for 322 galaxies from the Sloan Digital Sky Survey and the GALEX database. Single stellar population (SSP) ages were obtained from the absorption features in the optical spectra using the method employed by Trager (2000a & 2000b). This report discusses our e®orts to ¯nd an anti-correlation between the (FUV-NUV) colours and the optical SSP ages of the galaxies, i.e. a bluer (FUV-NUV) colour should trace recent star formation, given the predictions of stellar population models. We do not see such an anti-correlation; we suggest that the UV colours and the optical obsorption line strengths arise from di®erent stellar populations.,

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:28
Last Modified: 15 Feb 2018 07:28
URI: http://fse.studenttheses.ub.rug.nl/id/eprint/8414

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