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The Millennium Galaxy Catalogue: on the natural subdivision of galaxies

Ellis, S; Driver, Simon; Allen, Paul; Liske, Jochen; Bland-Hawthorn, Joss; de Propris, Roberto

Description

The distribution of global photometric, spectroscopic, structural and morphological parameters for a well-defined sample of 350 nearby galaxies has been examined. The usual trends were recovered demonstrating that E/SO galaxies are redder, more quiescent, more centrally concentrated and possess larger Sérsic indices than late-type galaxies. Multivariate statistical analyses were performed to examine the distribution of all parameters simultaneously. The main result of these analyses was the...[Show more]

dc.contributor.authorEllis, S
dc.contributor.authorDriver, Simon
dc.contributor.authorAllen, Paul
dc.contributor.authorLiske, Jochen
dc.contributor.authorBland-Hawthorn, Joss
dc.contributor.authorde Propris, Roberto
dc.date.accessioned2015-12-13T22:52:07Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/81405
dc.description.abstractThe distribution of global photometric, spectroscopic, structural and morphological parameters for a well-defined sample of 350 nearby galaxies has been examined. The usual trends were recovered demonstrating that E/SO galaxies are redder, more quiescent, more centrally concentrated and possess larger Sérsic indices than late-type galaxies. Multivariate statistical analyses were performed to examine the distribution of all parameters simultaneously. The main result of these analyses was the existence of only two classes of galaxies, corresponding closely to early and late types. Linear discriminant analysis (LDA) was able to reproduce the classifications of early- and late-type galaxies with high success, but further refinement of galaxy types was not reproduced in the distribution of observed galaxy properties. A principal components analysis (PCA) showed that the major variance of the parameter set corresponded to a distinction between early and late types, highlighting the importance of the distinction. A hierarchical clustering analysis (HCA) revealed only two clear natural classes within the parameter set, closely corresponding to early and late types. Early and late types are clearly distinct and the distinction is of fundamental importance. In contrast, late types from Sa to Irr are smoothly distributed throughout the parameter space. A population of galaxies classified by eye as elliptical/lenticular, and exhibiting concentration indices similar to early types were found to have a significant star formation activity. These galaxies are preferentially faint, suggesting they are low-mass systems.
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.subjectKeywords: Galaxies: evolution; Galaxies: fundamental parameters
dc.titleThe Millennium Galaxy Catalogue: on the natural subdivision of galaxies
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume363
dc.date.issued2005
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationMigratedxPub9702
local.type.statusPublished Version
local.contributor.affiliationEllis, S, Anglo-Australian Observatory
local.contributor.affiliationDriver, Simon, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationAllen, Paul, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationLiske, Jochen, European Southern Observatory
local.contributor.affiliationBland-Hawthorn, Joss, Anglo-Australian Observatory
local.contributor.affiliationde Propris, Roberto, University of New South Wales
local.description.embargo2037-12-31
local.bibliographicCitation.startpage1257
local.bibliographicCitation.lastpage1271
local.identifier.doi10.1111/j.1365-2966.2005.09521.x
dc.date.updated2015-12-11T10:49:06Z
local.identifier.scopusID2-s2.0-27744572096
CollectionsANU Research Publications

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