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Understanding the surface-brightness distribution of disc galaxies

Davies, Jonathan Ivor, Phillipps, S., Disney, Michael John, Boyce, P. and Evans, R. 1994. Understanding the surface-brightness distribution of disc galaxies. Monthly Notices of the Royal Astronomical Society 268 (4) , pp. 984-988.

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It is difficult to understand why disc galaxies should all form with about the same central surface brightness (central mass density?). A possible explanation is that the data are in fact heavily biased by observational selection. In a number of papers we have shown how this might arise. In this paper we take a new look at van der Kruit's assertion that the observational selection effects are unimportant. We show that his data are incomplete on the low-surface-brightness side and that they are probably constrained by a hidden magnitude constraint that he did not consider. We go on to test the selection hypothesis by analysing a set of observational data for which redshifts are available. The volume occupied by galaxies of different surface brightnesses in this sample are in good agreement with those predicted by observational selection. We conclude that the selection hypothesis has not been disproved and that there is still good reason to expect it to be true.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies:fundamental parameters ; galaxies: photometry ; galaxies: spiral
Publisher: Wiley
ISSN: 0035-8711
Last Modified: 04 Jun 2017 04:25

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