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Dust Heating from Active Galactic Nuclei

Ebbers, Bastiaan (2024) Dust Heating from Active Galactic Nuclei. Bachelor's Thesis, Astronomy.

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Abstract

In this research project, I try to find a relation between the IR luminosity and the AGN fraction estimated in two ranges, 3-30 µm and 8-1000 µm. Additionally, I want to find out if this relation differs between the two wavelength ranges. I use a GAMA and deblended COSMOS2020 catalogue to create a distribution of sources from 0 < z < 3. I fit the data with CIGALE with different AGN models, SKIRTOR and Fritz, to find the Bayesian estimated AGN contribution to the SED. To reduce a bias towards (U)LIRGs, I split the sources into six redshift bins. Next, I plot the IR luminosities against the Bayesian AGN fraction in a scatter plot and fit a Sigmoid-like function through the plot. In this paper, I found a relation between the IR luminosity and the AGN fraction, but with a significant scattering of sources. The relation seemed to fit better for some redshift bins than others. Therefore, it seems like the relation is also redshift dependent, specifically in the SKIRTOR plots. The Fritz model shows a more extensive IR luminosity range and more cluttering around specific values for the AGN fraction. On the contrary, The SKIRTOR model shows a much smoother distribution of data points and a smaller IR luminosity range. There does not seem to be any significant difference between the two wavelength ranges. I advise further research to use empirical AGN templates to determine the AGN fraction and fitting a redshift-dependent function onto the scatter points.

Item Type: Thesis (Bachelor's Thesis)
Supervisor name: Wang, L.
Degree programme: Astronomy
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Jul 2024 07:22
Last Modified: 25 Jul 2024 09:32
URI: https://fse.studenttheses.ub.rug.nl/id/eprint/33072

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