Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm

 

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dc.contributor.advisor Kraan-Korteweg, Renee Christine
dc.contributor.advisor Jarrett, Thomas H.
dc.contributor.author Lambert, Trystan
dc.date.accessioned 2021-02-04T14:02:03Z
dc.date.available 2021-02-04T14:02:03Z
dc.date.issued 2020_
dc.identifier.citation Lambert, T. 2020. Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm. . ,Faculty of Science ,Department of Astronomy. http://hdl.handle.net/11427/32785 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/32785
dc.description.abstract A galaxy group catalogue for the recently-completed 2MASS Redshift Survey (2MRS, Macri et al., 2019) is presented which consists of 44572 redshifts, including 1041 new measurements for galaxies mostly located within the Zone of Avoidance. The galaxy group catalogue is generated using a novel, graph-theory based, modified version of the Friends-of-Friends algorithm. Several graph-theory examples are presented throughout this paper, and include a new method to identify substructures within groups. The results and graph-theory methods have been thoroughly interrogated against previous 2MRS group catalogues and a Theoretical Astrophysical Observatory (TAO) mock by making use of cutting-edge visualization techniques including immersive facilities, a digital planetarium, and virtual reality. This has resulted in a stable and robust catalogue with on-sky positions and line-of-sight distances within 0.5 Mpc and 2 Mpc of the group respectively. It has recovered all major groups and clusters. The final catalogue consists of 3022 groups, resulting in the most complete “whole-sky” galaxy group catalogue to date. The 3D-positions of the groups are presented, as well as their luminosity and comoving distances, observed and corrected number of members, richness metric, velocity dispersion, and estimates of R200 and M200. Three additional catalogues are provided: 2MRS galaxies found in groups, a catalogue of subgroups, and the catalogue of 687 new group candidates which had no counterparts in previous 2MRS-based analyses.
dc.subject Astrophysics
dc.title Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm
dc.type Master Thesis
dc.date.updated 2021-02-03T15:14:56Z
dc.language.rfc3066 eng
dc.publisher.faculty Faculty of Science
dc.publisher.department Department of Astronomy
dc.type.qualificationlevel Masters
dc.type.qualificationlevel MSc
dc.identifier.apacitation Lambert, T. (2020). <i>Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm</i>. (). ,Faculty of Science ,Department of Astronomy. Retrieved from http://hdl.handle.net/11427/32785 en_ZA
dc.identifier.chicagocitation Lambert, Trystan. <i>"Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm."</i> ., ,Faculty of Science ,Department of Astronomy, 2020. http://hdl.handle.net/11427/32785 en_ZA
dc.identifier.vancouvercitation Lambert T. Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm. []. ,Faculty of Science ,Department of Astronomy, 2020 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/32785 en_ZA
dc.identifier.ris TY - Master Thesis AU - Lambert, Trystan AB - A galaxy group catalogue for the recently-completed 2MASS Redshift Survey (2MRS, Macri et al., 2019) is presented which consists of 44572 redshifts, including 1041 new measurements for galaxies mostly located within the Zone of Avoidance. The galaxy group catalogue is generated using a novel, graph-theory based, modified version of the Friends-of-Friends algorithm. Several graph-theory examples are presented throughout this paper, and include a new method to identify substructures within groups. The results and graph-theory methods have been thoroughly interrogated against previous 2MRS group catalogues and a Theoretical Astrophysical Observatory (TAO) mock by making use of cutting-edge visualization techniques including immersive facilities, a digital planetarium, and virtual reality. This has resulted in a stable and robust catalogue with on-sky positions and line-of-sight distances within 0.5 Mpc and 2 Mpc of the group respectively. It has recovered all major groups and clusters. The final catalogue consists of 3022 groups, resulting in the most complete “whole-sky” galaxy group catalogue to date. The 3D-positions of the groups are presented, as well as their luminosity and comoving distances, observed and corrected number of members, richness metric, velocity dispersion, and estimates of R200 and M200. Three additional catalogues are provided: 2MRS galaxies found in groups, a catalogue of subgroups, and the catalogue of 687 new group candidates which had no counterparts in previous 2MRS-based analyses. DA - 2020_ DB - OpenUCT DP - University of Cape Town KW - Astrophysics LK - https://open.uct.ac.za PY - 2020 T1 - Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm TI - Galaxy groups in the updated 2MRS using a graph-theory based friends-of-friends algorithm UR - http://hdl.handle.net/11427/32785 ER - en_ZA


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