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Reverberation mapping of Active Galactic Nuclei
Recent times have seen an increase in observational campaigns aimed at contributing to the overall sample of active galactic nuclei (AGNs) with central super-massive black hole (SMBH) mass estimates using reverberation mapping (RM) technique. RM makes use of the time variability of the broad emissio...
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| Format: | Thesis |
| Language: | English |
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Department of Astronomy
2023
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| _version_ | 1867613247673204736 |
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| access_status_str | Open Access |
| author | Hlabathe, Michael |
| author2 | Whitelock, Patricia |
| author_browse | Hlabathe, Michael Whitelock, Patricia |
| author_facet | Whitelock, Patricia Hlabathe, Michael |
| author_sort | Hlabathe, Michael |
| collection | Thesis |
| description | Recent times have seen an increase in observational campaigns aimed at contributing to the overall sample of active galactic nuclei (AGNs) with central super-massive black hole (SMBH) mass estimates using reverberation mapping (RM) technique. RM makes use of the time variability of the broad emission lines from the nearby broad-line region (BLR) to measure their time response or delay (τ) relative to the incident ionizing continuum from the accretion disc. This delay is a consequence of light-travel time effects and directly enables the size of the BLR to be determined as RBLR = cτ (c is speed of light). Assuming virialized motions of the gas clouds in the BLR, and combining the velocity width (∆V ) of a Doppler broadened emission line with RBLR leads to the estimation of the black hole mass M. RM can also be used to measure the accretion-disc size in which the X-ray variability source is assumed to drive UV/optical variations in the accretion disc leading to wavelength-dependent delays that scale as τ ∝ λ 4/3 . Here, both aspects of RM are explored using photometric and spectroscopic observations of 3C 120, PG 2304+043 and SDSS J132447.65+032432.6, with observations emanating from the Southern African Large Telescope (SALT) and Las Cumbres Observatory (LCO) robotic telescopes. The broad emission-line and inter-band continuum delays in these AGNs are measured using the Interpolated Cross-Correlation Function (ICCF) and Continuum REverberation AGN Markov Chain Monte Carlo (CREAM). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/38497 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:07.122Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | Department of Astronomy |
| publisherStr | Department of Astronomy |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/38497 Reverberation mapping of Active Galactic Nuclei Hlabathe, Michael Whitelock, Patricia Galactic Nuclei Recent times have seen an increase in observational campaigns aimed at contributing to the overall sample of active galactic nuclei (AGNs) with central super-massive black hole (SMBH) mass estimates using reverberation mapping (RM) technique. RM makes use of the time variability of the broad emission lines from the nearby broad-line region (BLR) to measure their time response or delay (τ) relative to the incident ionizing continuum from the accretion disc. This delay is a consequence of light-travel time effects and directly enables the size of the BLR to be determined as RBLR = cτ (c is speed of light). Assuming virialized motions of the gas clouds in the BLR, and combining the velocity width (∆V ) of a Doppler broadened emission line with RBLR leads to the estimation of the black hole mass M. RM can also be used to measure the accretion-disc size in which the X-ray variability source is assumed to drive UV/optical variations in the accretion disc leading to wavelength-dependent delays that scale as τ ∝ λ 4/3 . Here, both aspects of RM are explored using photometric and spectroscopic observations of 3C 120, PG 2304+043 and SDSS J132447.65+032432.6, with observations emanating from the Southern African Large Telescope (SALT) and Las Cumbres Observatory (LCO) robotic telescopes. The broad emission-line and inter-band continuum delays in these AGNs are measured using the Interpolated Cross-Correlation Function (ICCF) and Continuum REverberation AGN Markov Chain Monte Carlo (CREAM). 2023-09-11T06:50:49Z 2023-09-11T06:50:49Z 2023 2023-09-08T14:04:43Z Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/38497 eng application/pdf Department of Astronomy Faculty of Science |
| spellingShingle | Galactic Nuclei Hlabathe, Michael Reverberation mapping of Active Galactic Nuclei |
| thesis_degree_str | Doctoral |
| title | Reverberation mapping of Active Galactic Nuclei |
| title_full | Reverberation mapping of Active Galactic Nuclei |
| title_fullStr | Reverberation mapping of Active Galactic Nuclei |
| title_full_unstemmed | Reverberation mapping of Active Galactic Nuclei |
| title_short | Reverberation mapping of Active Galactic Nuclei |
| title_sort | reverberation mapping of active galactic nuclei |
| topic | Galactic Nuclei |
| url | http://hdl.handle.net/11427/38497 |
| work_keys_str_mv | AT hlabathemichael reverberationmappingofactivegalacticnuclei |