The globular cluster system of the edge-on spiral galaxy NGC 5170

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dc.contributor.authorFischer, Philippeen_US
dc.date.accessioned2024-08-13T22:22:28Z
dc.date.available2024-08-13T22:22:28Z
dc.date.copyright1989en_US
dc.date.issued1989
dc.degree.departmentDepartment of Physics and Astronomy
dc.degree.levelMaster of Science M.Sc.en
dc.description.abstractA CCD study of the edge-on spiral galaxy, NGC 5170, was carried out with the CTIO 4m telescope to search for its globular cluster system. Three V frames near the galaxy and two removed from it (for background estimation) were analysed. Following median filtering to remove as much of the galaxy light as possible and DAOPHOT analyses, a total of about 130 ± 20 presumed clusters were detected within 2 arcmin of the galaxy's centre above a foreground of Galactic stars and a background of distant galaxies. The photometry does not appear to reach the peak of the globular cluster luminosity function . After incompleteness corrections are made, a total cluster population of~ 815 ± 320 is inferred. This leads to a specific frequency of S = 1.3 ± 0.5 or Sapheroidal = 3.9 ± 1.5, values consistent with what is seen for other isolated disk galaxies. A power law fit to the radial density distribution yields an index of -1.69 ± 0.26, which is again consistent with the globular cluster systems of other galaxies .of NGC 5170's total luminosity. The visual distance modulus estimated from the globular cluster luminosity function, 32.3 ± 0.3, agrees well with the Fisher-Tully distance, 32.5, but the agreement may be somewhat fortuitous, inasmuch as the cluster data do not reach the luminosity function peak.
dc.format.extent96 pages
dc.identifier.urihttps://hdl.handle.net/1828/17767
dc.rightsAvailable to the World Wide Weben_US
dc.titleThe globular cluster system of the edge-on spiral galaxy NGC 5170en_US
dc.typeThesisen_US

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