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Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240
Dissertation (MSc (Physics))--University of Pretoria, 2022.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2022
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| _version_ | 1867613714298961920 |
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| access_status_str | Open Access |
| author2 | Deane, Roger |
| author_browse | Deane, Roger |
| author_facet | Deane, Roger |
| collection | Thesis |
| dc_rights_str_mv | © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Physics))--University of Pretoria, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/87744 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:40:31.851Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/87744 Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 Deane, Roger u16283865@tuks.co.za Santana, Karina Caitlin Radio Astronomy Galaxy mergers Neutral Hydrogen NGC6240 Dual AGN Physics UCTD Dissertation (MSc (Physics))--University of Pretoria, 2022. NGC 6240 is a prototypical merger system in the nearby universe hosting a dual active galactic nucleus. It is a well studied object and has been observed across the electromagnetic spectrum using most major ground- and space-based observatories over several decades. In this thesis, we report on the first detection of H I emission in this system. We find that there are two planes of H I emission, one aligned with the galactic dust plane and the other in line with a neighbouring galaxy at a projected separation of ∼90 kpc. This interacting neighbour has extended ultravio let and compact x-ray emission, indicating active star formation and active nuclear black hole accretion, respectively. As far as we are aware, this is the first evidence of an interaction between NGC 6240 and this neighbouring galaxy. Overall, the H I emission is predominately found to the south of the dual AGN, including some tidal debris to the south-west. The previously reported H I absorption is shown to have the same orientation as the galaxy disk, based on the high-imaging fidelity and sensitivity, which enable high relative astrometry of the absorption line. Combining the above, we are able to compare and contrast the H I emission and absorption view, providing a richer picture of this prototypical local-universe merger system. Detailed H I studies such as this will improve our understanding of H I at galaxy formation and evolution in higher redshift systems, where the galaxy merger rate, AGN prevalence, and cosmic star formation rate density all show a dramatic increas SARAO Physics MSc (Physics) Unrestricted 2022-10-17T09:52:11Z 2022-10-17T09:52:11Z 2022 2022 Dissertation * A2023 https://repository.up.ac.za/handle/2263/87744 https://doi.org/10.25403/UPresearchdata.21310749 en © 2022 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Radio Astronomy Galaxy mergers Neutral Hydrogen NGC6240 Dual AGN Physics UCTD Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 |
| title | Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 |
| title_full | Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 |
| title_fullStr | Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 |
| title_full_unstemmed | Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 |
| title_short | Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 |
| title_sort | neutral hydrogen in the archetype post merger dual active galactic nucleus system ngc 6240 |
| topic | Radio Astronomy Galaxy mergers Neutral Hydrogen NGC6240 Dual AGN Physics UCTD |
| url | https://repository.up.ac.za/handle/2263/87744 https://doi.org/10.25403/UPresearchdata.21310749 |