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For refcode 1990A&A...240...36S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1990A&A...240...36S Characterising "box/peanut" galactic bulge morphology M. Shaw, R.-J. Dettmar, and A. Barteldrees Department of Astronomy, University of Manchester, Manchester, M 13 9PL, England Radioastronomisches Institut der Universitat Bonn, Auf dem Hugel 71, D-5300 Bonn 1, Federal Republic of Germany Max-Planck Institut fur Radioastronomie, Auf dem Hugel 69, D-5300 Bonn 1, Federal Republic of Germany Received March 28, accepted May 16, 1990 Abstract. We have conducted principal component analyses of a large sample of edge-on galaxies displaying "box" or "peanut"-shaped bulge distortions, with a view to identifying the characteristic photometric properties of such morphology. A variety of statistical tests have been applied to elucidate the importance of small number statistics to the results thus derived, and several independent measures of "eigenvalue significance" have been used to confirm the dimensionality of the defined parameter space. In addition, bootstrap analyses have been conducted so as to simulate large numbers of principal component analyses and thereby identify the uncertainties on the eigenvalues thus defined. The parameter space identified is strictly two-dimensional, indicating that (of those adopted here) no single parameter exists by which one could fully characterise box/peanut morphology. The most significant parameters are found to be measures of bulge dimension, and the bulge: total luminosity ratio (or morphological type). Furthermore, we show that weak boxes and extreme peanuts are merely extrema in a homogeneous family of such isophotal distortions. We find that the disc scale is not an important factor in our principal component analyses. This appears not to result from our selection of edge-on galaxies, but to be intrinsic to those edge-on galaxies possessing box/peanut bulge distortions. This suggests that the disc component is not an important constraint on the formation and/or subsequent evolution of such bulges. The implications of this conclusion for an understanding of box/peanut bulges are briefly addressed. Key words: galaxies: photometry of - galaxies: structure of - galaxies: "box/peanut" bulges - numerical methods: principal component analyses, bootstrap analyses
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