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A radical look at starburst galaxies modeling the dusty cores of starburst ULIRGs

Loenen, A.F. (2005) A radical look at starburst galaxies modeling the dusty cores of starburst ULIRGs. Master's Thesis / Essay, Astronomy.

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Despite extensive observations over the last decades, the central questions regarding the power source of the large infrared (IR) luminosity of Ultra Luminous Infra Red Galaxies (ULIRGs), and their evolution, are still not fully answered. In this paper we will focus on massive star formation as a central engine and present an evolutionary model for these dust-enshrouded star formation regions. An evolutionary model was created using existing star formation and radiative transfer codes. The results of the simulations are compared to data from two IRAS catalogs. The simulations show that starburst galaxies can be powered by massive star formation. The parameters for this star forming region are, however, difficult to determine, since the IR luminosity is only sensitive to the total UV input. Therefore there is a degeneracy between the total starburst mass and the initial mass function (IMF) slope. A less massive star formation with a shallower IMF will produce the same amount of OB stars and therefore the same amount of irradiating UV flux. Assuming the stars are formed according to a Salpeter IMF (Psi(M) ~ M-2.35), the star formation region should produce 109 solar masses of stars (either in one instantaneous burst, or in a continuous process) in order to produce enough IR radiation.

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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