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Star-formation activity in abell 2670

Lugt, F.F.H. (2003) Star-formation activity in abell 2670. Master's Thesis / Essay, Astronomy.

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I present an analysis of the star-formation activity in cluster Abell 2670, detected using radio continuum observations at 20 cm. 46 Star-forming galaxies have been found. This unusually high level of activity can for a large part be explained by the fact that three subclusters are merging in A2670, where galaxies that have just passed the shock front of their subcluster start interacting with the ICM. Also galaxies at the high density in the X-ray region have been found forming stars. This result has been compared with results of the spectral classification performed on galaxies. It is concluded that both the optical and the radio method to identity star-formation galaxies are not sufficient. Due to heavy dust extinction the blue colour and emission lines may not be visible in the optical observations, resulting in a false classification. Galaxies that have very recently started forming stars may not have produced sufficient Supernovae to result in a high radio flux, which makes those galaxies difficult to observe in the radio. When one wishes to get a complete picture of the star-forming activity, both methods should be pursued. A complete picture of the star-forming activity in Abell 2670 has been obtained in that way.

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

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