Tress Barojas, Mónica Christel;
(2020)
Understanding the Role of Dust in Star Forming Galaxies through NUV and Optical Photometry.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
Dust is an important element in the universe. Dust effects are evident when one examines the wavelength dependency of the dust attenuation law: it absorbs and scatters at shorter wavelengths and re-emits in the infrared. Good constraints on the dust attenuation law allow us to calculate robust star formation rates, stellar masses, and other stellar parameters. The main goal in this work is to test the non- universality of the dust attenuation law for galaxies. As a first step to analyse the dust attenuation law of star-forming galaxies at z ∼ 2, we compared sets of synthetic population models from Bruzual and Charlot (2003) to UVOT and SDSS simulated photometry, using a parametric dust attenuation law to characterise the dust attenu- ation parameter E(B − V ). The next step was to test this method with simulations similar to the Survey of Red and Dead Sources (SHARDS) photometry. Thus, find- ing the best way to assess SHARDS data. This analysis involved taking into account R V , NUV bump and redshift as new parameters in our methodology, which allowed us to constrain the dust attenuation law of ∼ 1700 galaxies at redshift 1.5 < z < 3. A wide range of dust parameters were found, a contrast from the often assumed universality of the dust attenuation law. Another intriguing result was the correlation between R v and the NUV bump strength, which can be explained either by a variation on the dust geometry or due to a trend in the grain size distribution of the dust. To discriminate between these two explanations, we built a set of simulations. They share the important characteristic of having the same underlying dust extinction properties, to explore the role that dust geometry plays. Finally, this analysis points to geometry as the main driver for the R v and NUV bump trend.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Understanding the Role of Dust in Star Forming Galaxies through NUV and Optical Photometry |
| Event: | UCL (University College London) |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2020. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10107710 |
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