@article{dressler_galaxy_1980,
	title = {Galaxy morphology in rich clusters - {Implications} for the formation and evolution of galaxies},
	volume = {236},
	issn = {0004-637X},
	url = {http://adsabs.harvard.edu/abs/1980ApJ...236..351D},
	doi = {10.1086/157753},
	abstract = {The paper presents a study of the galaxy populations in 55 rich clusters 
along with a discussion of the implications for the formation and/or
evolution of different morphological types. A well defined relationship
is found between local galaxy density and galaxy type, which indicates
an increasing elliptical and S0 population and a corresponding decrease
in spirals with increasing density. Attention is given to evidence which
contradicts the interpretation that these gradients in population result
from the production of S0 galaxies when spirals are swept of disk gas by
an IGM. In addition, as an alternative to the hypothesis of spiral
sweeping, it is suggested that the local density/morphological-type
relation reflects the long time scale associated with the formation of
the disk component of galaxies. Finally, the data also indicate a trend
of increasing luminosity of the spheroidal component with increasing
local density.},
	urldate = {2017-03-06},
	journal = {The Astrophysical Journal},
	author = {Dressler, A.},
	month = mar,
	year = {1980},
	keywords = {Astronomical Maps, Density Distribution, Elliptical Galaxies, Galactic Clusters, Galactic Evolution, Galactic Structure, Spiral Galaxies, Telescopes, Universe, X Ray Astronomy, interstellar gas},
	pages = {351--365},
}

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