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Astron. Astrophys. 334, 453-458 (1998)

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Color distributions in E-S0 galaxies

I. Frequency and importance of dust patterns for various brands of E classified galaxies *

R. Michard

1 Observatoire de la Cote d'Azur, Département Augustin Fresnel B.P. 229, F-06304 Nice Cedex 4, France
2 Observatoire de Paris, DEMIRM, 77 av. Denfert-Rochereau, F-75015 Paris, France

Received 20 October 1997 / Accepted 11 February 1998

Abstract

From the consideration of a sample of color distributions in 67 E classified objects of the Local Supercluster, it is found that local dust features are much more frequent and important in disky E's than boxy E's. The subclass of undeterminate objects, those which cannot be assigned to the diE or boE groups, is intermediate.

Subsets of objects of common properties are considered from the point of view of local dust features occurrence: giant boxy E's; minor boxy E's with rotational support; compact dwarfs; SB0-like E's.

It is noted that the detection of dust features is more than twice less frequent in Virgo cluster ellipticals than in the full sample, but the significance of this result is not clear.

Key words: galaxies: elliptical and lenticular, cD – galaxies: fundamental parameters – galaxies: ISM

* Based on observations collected at the Canada-France-Hawaii Telescope and at the Observatoire du Pic du Midi

Send offprint requests to: R. Michard

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© European Southern Observatory (ESO) 1998

Online publication: May 15, 1998

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