Properties of close pairs of galaxies

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dc.contributor.authorMcCracken, Henry Joyen_US
dc.date.accessioned2024-08-14T22:44:27Z
dc.date.available2024-08-14T22:44:27Z
dc.date.copyright1995en_US
dc.date.issued1995
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractColour and clustering properties of galaxies at small angular separations are investigated using three new galaxy catalogues and the following conclu­sions are drawn: Firstly, field galaxies are slightly redder than paired galaxies, and the correlation amplitude of redder galaxies is found to be higher than that of bluer galaxies. These results are interpreted as a consequence of the higher correlation strength of early-type galaxies. Secondly, the small-angle correlation function is well described by extrap­olation of the (large-angle) Infante and Pritchet (1995) correlation functions to these separations. Pair count ratios in two angular bins agree well with predictions of these correlation functions. These results argue there is no excess in close pairs of galaxies, a result found for all three catalogues. Lastly, the low small-separation correlation amplitudes found indicate that the fraction of galaxies in physical pairs at these separations is small. Consequently, this implies that merger detection by pair/field colour differ­ences is difficult and would require larger sample than currently available. The low merger rates derived for our sample, together with low corre­lation function amplitudes and lack of excess over the Infante and Pritchet correlation functions argue against significant merging in the galaxy popula­tion as described by scenarios like Broadhurst et al. (1988). Consequently, we prefer models in which the faint blue excess is explained in terms of starburst­ing dwarf galaxies or an incorrectly determined local luminosity function.
dc.format.extent84 pages
dc.identifier.urihttps://hdl.handle.net/1828/18906
dc.rightsAvailable to the World Wide Weben_US
dc.titleProperties of close pairs of galaxiesen_US
dc.typeThesisen_US

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