Reverberation mapping of Active Galactic Nuclei
| dc.contributor.advisor | Whitelock, Patricia | |
| dc.contributor.author | Hlabathe, Michael | |
| dc.date.accessioned | 2023-09-11T06:50:49Z | |
| dc.date.available | 2023-09-11T06:50:49Z | |
| dc.date.issued | 2023 | |
| dc.date.updated | 2023-09-08T14:04:43Z | |
| dc.description.abstract | 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). | |
| dc.identifier.apacitation | Hlabathe, M. (2023). <i>Reverberation mapping of Active Galactic Nuclei</i>. (). ,Faculty of Science ,Department of Astronomy. Retrieved from http://hdl.handle.net/11427/38497 | en_ZA |
| dc.identifier.chicagocitation | Hlabathe, Michael. <i>"Reverberation mapping of Active Galactic Nuclei."</i> ., ,Faculty of Science ,Department of Astronomy, 2023. http://hdl.handle.net/11427/38497 | en_ZA |
| dc.identifier.citation | Hlabathe, M. 2023. Reverberation mapping of Active Galactic Nuclei. . ,Faculty of Science ,Department of Astronomy. http://hdl.handle.net/11427/38497 | en_ZA |
| dc.identifier.ris | TY - Doctoral Thesis AU - Hlabathe, Michael AB - 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). DA - 2023_ DB - OpenUCT DP - University of Cape Town KW - Galactic Nuclei LK - https://open.uct.ac.za PY - 2023 T1 - Reverberation mapping of Active Galactic Nuclei TI - Reverberation mapping of Active Galactic Nuclei UR - http://hdl.handle.net/11427/38497 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/38497 | |
| dc.identifier.vancouvercitation | Hlabathe M. Reverberation mapping of Active Galactic Nuclei. []. ,Faculty of Science ,Department of Astronomy, 2023 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/38497 | en_ZA |
| dc.language.rfc3066 | eng | |
| dc.publisher.department | Department of Astronomy | |
| dc.publisher.faculty | Faculty of Science | |
| dc.subject | Galactic Nuclei | |
| dc.title | Reverberation mapping of Active Galactic Nuclei | |
| dc.type | Doctoral Thesis | |
| dc.type.qualificationlevel | Doctoral | |
| dc.type.qualificationlevel | PhD |