Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT

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dc.contributor.advisorCarignan, Claudeen_ZA
dc.contributor.advisorVan Gorkom, Jacqueline Hen_ZA
dc.contributor.advisorHess, Kelley Men_ZA
dc.contributor.authorSorgho, Amidouen_ZA
dc.date.accessioned2016-01-21T13:01:00Z
dc.date.available2016-01-21T13:01:00Z
dc.date.issued2015en_ZA
dc.description.abstractTo date, our understanding of the formation and evolution of galaxies attributes a very important role to the neutral hydrogen (HI) gas since it constitutes the reservoir of fuel out of which galaxies form stars. In their evolution, galaxies interact with each other and with their environment, and very often these interactions leave fingerprints in the HI distribution. The extended HI envelopes of galaxies are sensitive tracers of those tidal interactions. In the present study, we map the HI distribution of galaxies in a ~1.5° X 2.5° region of the Virgo cluster using the Karoo Array Telescope (KAT-7) and the Westerbork Synthesis Radio Telescope (WSRT). With a total observing time of ~78 hours with the KAT-7 and 48 hours with the WSRT, we search for low HI column density features in the region. Despite the different observing time and beam size of the two telescopes, we reach similar column density sensitivities of NHI ~1 X 10¹⁸ atoms cm⁻² over 16.5kms⁻¹. With a new approach, we combine the two observations to map both the large and small scale structures. We detect, out to an unprecedented extent, an HI tail of ~60 kpc being stripped off NGC 4424, a peculiar spiral galaxy. The properties of the galaxy, together with the shape of the tail, suggests that NGC 4424 is a post-merger galaxy undergoing a ram pressure stripping as it falls into the centre of the Virgo Cluster along a filamentary structure. We also give the HI parameters of the galaxies detected.en_ZA
dc.identifier.apacitationSorgho, A. (2015). <i>Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Astronomy. Retrieved from http://hdl.handle.net/11427/16495en_ZA
dc.identifier.chicagocitationSorgho, Amidou. <i>"Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Astronomy, 2015. http://hdl.handle.net/11427/16495en_ZA
dc.identifier.citationSorgho, A. 2015. Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Sorgho, Amidou AB - To date, our understanding of the formation and evolution of galaxies attributes a very important role to the neutral hydrogen (HI) gas since it constitutes the reservoir of fuel out of which galaxies form stars. In their evolution, galaxies interact with each other and with their environment, and very often these interactions leave fingerprints in the HI distribution. The extended HI envelopes of galaxies are sensitive tracers of those tidal interactions. In the present study, we map the HI distribution of galaxies in a ~1.5° X 2.5° region of the Virgo cluster using the Karoo Array Telescope (KAT-7) and the Westerbork Synthesis Radio Telescope (WSRT). With a total observing time of ~78 hours with the KAT-7 and 48 hours with the WSRT, we search for low HI column density features in the region. Despite the different observing time and beam size of the two telescopes, we reach similar column density sensitivities of NHI ~1 X 10¹⁸ atoms cm⁻² over 16.5kms⁻¹. With a new approach, we combine the two observations to map both the large and small scale structures. We detect, out to an unprecedented extent, an HI tail of ~60 kpc being stripped off NGC 4424, a peculiar spiral galaxy. The properties of the galaxy, together with the shape of the tail, suggests that NGC 4424 is a post-merger galaxy undergoing a ram pressure stripping as it falls into the centre of the Virgo Cluster along a filamentary structure. We also give the HI parameters of the galaxies detected. DA - 2015 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT TI - Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT UR - http://hdl.handle.net/11427/16495 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/16495
dc.identifier.vancouvercitationSorgho A. Observing galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRT. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Astronomy, 2015 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/16495en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Astronomyen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherAstronomyen_ZA
dc.subject.otherAstrophysics and Space Scienceen_ZA
dc.titleObserving galaxies in the Southern Filament of the Virgo Cluster with KAT-7 and WSRTen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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