The Ha galaxy survey VII. The spatial distribution of star formation within disks and bulges

P. A. James; C. F. Bretherton; J. H. Knapen

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The Ha galaxy survey VII. The spatial distribution of star formation within disks and bulges

机译：The Ha galaxy survey VII. The spatial distribution of star formation within disks and bulges

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Aims. We analyse the current build-up of stellar mass within the disks and bulges of nearby galaxies through a comparison of thespatial distributions of forming and old stellar populations.Methods. Ha and R-band imaging are used to determine the distributions of young and old stellar populations in 313 S0a-Im fieldgalaxies out to ~40 Mpc. Concentration indices and mean normalised light profiles are calculated as a function of galaxy type and barclassification.Results. The mean profiles and concentration indices show a strong and smooth dependence on galaxy type. Apart from a centraldeficit due to bulge/bar light in some galaxy types, mean Ha and R-band profiles are very similar. Mean profiles within a given typeare remarkably constant even given wide ranges in galaxy luminosity and size. SBc, SBbc, and particularly SBb galaxies have profilesthat are markedly different from those of unbarred galaxies. The Ha emission from individual SBb galaxies is studied in detail;virtually all show resolved central components and concentrations of star formation at or just outside the bar-end radius.Conclusions. Galaxy type is an excellent predictor of R-band light profile. In field galaxies, star formation has the same radialdistribution as R-band light, i.e. stellar mass is building at approximately constant morphology, with no strong evidence for outertruncation or inside-out disk formation. Bars have a strong impact on the radial distribution of star formation, particularly in SBbgalaxies.

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《Astronomy and astrophysics》 |2009年第1期|207-220|共14页
作者
P. A. James; C. F. Bretherton; J. H. Knapen;
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作者单位

Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD,UK;

Instituto de Astrofisica de Canarias, 38200 La Laguna, Spain;

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正文语种英语
中图分类天文学;
关键词
galaxies; spiral - galaxies; structure - galaxies; stellar content - galaxies; nuclei - galaxies; irregular;

The Ha galaxy survey VII. The spatial distribution of star formation within disks and bulges

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