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Where Do Obscured Active Galactic Nuclei fit in a Galaxy's Timeline?
dc.contributor.advisor | Kirkpatrick, Allison | |
dc.contributor.author | Hatcher, Cassandra | |
dc.date.accessioned | 2024-07-05T19:28:37Z | |
dc.date.available | 2024-07-05T19:28:37Z | |
dc.date.issued | 2021-12-31 | |
dc.date.submitted | 2021 | |
dc.identifier.other | http://dissertations.umi.com/ku:17964 | |
dc.identifier.uri | https://hdl.handle.net/1808/35329 | |
dc.description.abstract | Many X-ray bright active galactic nuclei (AGNs) are predicted to follow an extended stage of obscured black hole growth. In support of this picture we examine the X-ray undetected AGNs in the COSMOS field and compare their host galaxies with X-ray bright AGNs. We examine galaxies with M* 109.5MꙨ for the presence of AGNs at redshifts z = 0.5–3. We select AGNs in the infrared using Spitzer and Herschel detections and use color selection techniques to select AGNs within strongly star-forming hosts. We stack Chandra X-ray data of galaxies with an infrared (IR) detection but lacking an X-ray detection to obtain soft and hard fluxes, allowing us to measure the energetics of these AGNs. We find a clear correlation between X-ray luminosity and IR AGN luminosity in the stacked galaxies. We also find that X-ray undetected AGNs all lie on the main sequence—the tight correlation between the star formation rate and M* that holds for the majority of galaxies, regardless of mass or redshift. This work demonstrates that there is a higher population of obscured AGNs than previously thought. | |
dc.format.extent | 38 pages | |
dc.language.iso | en | |
dc.publisher | University of Kansas | |
dc.rights | Copyright held by the author. | |
dc.subject | Physics | |
dc.subject | Astronomy | |
dc.subject | Astronomy | |
dc.subject | Galaxy Evolution | |
dc.subject | Infrared Astronomy | |
dc.subject | Low- Luminosity Active Galactic Nuclei | |
dc.subject | Super Massive Black Holes | |
dc.subject | X-ray active galactic nuclei | |
dc.title | Where Do Obscured Active Galactic Nuclei fit in a Galaxy's Timeline? | |
dc.type | Thesis | |
dc.contributor.cmtemember | Crossfield, Ian | |
dc.contributor.cmtemember | Medvedev, Mikhail | |
dc.thesis.degreeDiscipline | Physics & Astronomy | |
dc.thesis.degreeLevel | M.S. | |
dc.identifier.orcid |
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