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Tidal distortions in pairs of early-type galaxies

  • Ph. Prugniel (a1) and E. Davoust (a2)

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We are conducting an imaging survey of pairs of elliptical galaxies which has already produced interesting results. Some pairs present a common pattern of distortion interpreted in terms of tidal effects (Davoust and Prugniel, 1988; Prugniel et al., 1989). Other examples drawn from the literature (Borne and Hoessel, 1988; Colina and Pérez-Fournon, 1990) share the same morphology. This Poster presents new cases and lists the characteristics of 24 such systems.

Our pairs are drawn from a sample of binary and multiple galaxies which has in turn been extracted from the CGCG, UGC (Nilson, 1973) and VV (Vorontsov-Velyaminov, 1959) catalogues. This sample includes that of Karachentsev (1972). It contains 1800 pairs, among which 700 are S – S or mixed morphology pairs. We are working on the remainder to produce a sample of close physical pairs of elliptical galaxies (we also include bulge dominated S0’s since the morphological discrimination from ellipticals is often ambiguous, in particular for interacting galaxies).

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References

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Borne, K.D., Hoessel, J.G.: 1988, Astrophys. J. 330, 51
Colina, L., Pérez-Fournon, I.: 1990, Astrophys. J. Suppl. 000, 000
Davoust, E., Prugniel, Ph.: 1988, Astron. Astrophys. Letters 201, L30
Karachensev, I.D.: 1972, Commun. Special Astrophys. Obs. USSR 7, 1
Nilson, P.: 1973, Uppsala Astron. Annals 6
Prugniel, Ph., Davoust, E., Nieto, J.-L.: 1989, Astron. Astrophys. 222, 5
Prugniel, Ph.: 1989, in 1st ESO/ST-ECF Data Analysis Workshop, ed. Grosbol, P.J. et al., p. 161
Stocke, J.T.: 1978, Astron. J. 83, 348
Valentijn, E.A., Casertano, S.: 1988, Astron. Astrophys. 206, 27
Vorontsov-Velyaminov, V.A.: 1959, Atlas and Catalogue of Interacting Galaxies (Sternberg State Astron. Inst., Moscow)

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