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Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey
Dissertation (MSc (Physics))--University of Pretoria, 2024.
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University of Pretoria
2024
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| _version_ | 1867613697227096064 |
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| access_status_str | Open Access |
| author2 | Thorat, Kshitij |
| author_browse | Thorat, Kshitij |
| author_facet | Thorat, Kshitij |
| collection | Thesis |
| dc_rights_str_mv | © 2023 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, 2024. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/95347 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:40:15.875Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| 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:2263/95347 Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey Thorat, Kshitij toivosamuel@gmail.com Dean, Roger Mabote, Toivo Samuel UCTD Dissertation (MSc (Physics))--University of Pretoria, 2024. A bent-tailed radio galaxy (BT) is an active radio-loud galaxy in which its double jet presents a bend in the same direction, possibly as a result of interaction with the intracluster medium (ICM). Our dataset was extracted from the MeerKAT Galaxy Cluster Legacy Survey (MGCLS). The MGCLS is a survey consisting of observations of 116 clusters at declinations ranging from -85° to ∼ 0°. Through visual inspection of the continuum images aided by an automated source finder, we have separated BT radio sources from other extended radio sources in the MGCLS images. As a result of the study, we present the largest catalogue of BTs to date using the MGCLS sample, from which we extracted 1292 BTs, of which 83% are wide-angle-tailed radio galaxies (WATs) and 17% are narrow-angle-tailed radio galaxies (NATs). As expected, most of the BT sources are estimated to fall below the traditional Fanaroff-Riley divide. We find that around 65% of BTs are associated with massive clusters (1014.5 to 1015 h−1 MJ) for a subsample of 37 galaxy clusters, within which we identified 401 BTs. Contrary to expectations, we do not observe a significant increase in the number of BTs in merging clusters; 45% of the clusters in MGCLS that we have confirmed as merging also contain 45% of the BTs. This may be due to MeerKAT presenting a more complete picture of the BT population. We observed a high number density of BTs in the cluster center region, with an exponential decrease as the distance from the cluster center increases. This pilot study provides the largest sample of BT sources and is well-suited for future studies, including machine-learning-based exploration, as well as highlighting the requirements of future studies using SKA precursors and pathfinders. NRF/SARAO Physics MSc (Physics) Unrestricted Faculty of Natural and Agricultural Sciences 2024-03-26T06:50:25Z 2024-03-26T06:50:25Z 2024-09 2024-03 Dissertation *Mabote, Toivo (2024). Calague of BT radio sources in MGCLS; Thesis; Turnitin declaration; Concept article; and data (figure 1 to 8).. University of Pretoria. Dataset. https://doi.org/10.25403/UPresearchdata.25472449 S2024 http://hdl.handle.net/2263/95347 10.25403/UPresearchdata.25472449 © 2023 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 | UCTD Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey |
| title | Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey |
| title_full | Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey |
| title_fullStr | Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey |
| title_full_unstemmed | Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey |
| title_short | Probing the Association of Galaxy Clusters with Bent-Tailed Radio Sources Using the MeerKAT Galaxy Cluster Legacy Survey |
| title_sort | probing the association of galaxy clusters with bent tailed radio sources using the meerkat galaxy cluster legacy survey |
| topic | UCTD |
| url | http://hdl.handle.net/2263/95347 |