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Title:
Stellar dynamics in E+E pairs of galaxies. 1: NGC 741/742, 1587/88 and 2672/73. The data
Authors:
Bonfanti, P.; Rampazzo, R.; Combes, F.; Prugniel, P.; Sulentic, J. W.
Affiliation:
AA(Univ. degli Stidu di Milano, Milano, Italy), AB(Univ. degli Stidu di Milano, Milano, Italy), AC(DEMIRM, Paris, France), AD(DEMIRM, Paris, France), AE(Univ. of Alabama, Tuscaloosa, AL)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. 28-36 (A&A Homepage)
Publication Date:
05/1995
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ELLIPTICAL GALAXIES, GALACTIC ROTATION, INTERACTING GALAXIES, STELLAR MOTIONS, STELLAR PHYSICS, VELOCITY DISTRIBUTION, ASTRONOMICAL SPECTROSCOPY, KINEMATICS, RADII
Bibliographic Code:
1995A&A...297...28B

Abstract

We present a kinematic study ofthree E+E galaxy pairs, NGC, 741/642, 1587/1588 (CPG 99) and 2672/2673 (CPG 175) All three pairs show a similar morpological distortion (i.e. the off-centering of inner versus outer isphototes; Davoust & Prungniel 1988) which is ascribed to the ongoing interaction. The data was obtained at the CFHT equipped with the Herzberg Spectrograph at a resolution of 0.88 A px-1 NGC741 and 2673 show significant rotation along the apparent minor axis. Both components of CPG 99 rotate very fast (with no evidence for rotation along the mirror axis of either component). None of the galaxies show abnormally high central velocity dispersion. We report some of the first clear detections of well defined velocity dispersions curves for interacting pairs. They show a systematic decrease with distance from the center, as expected for normal ellipticals. They do not show obvious heating in the outer parts as was previously reported. NGC 741 and 2672 show, respectively, possible U and inverse U-shaped structure in their velocity profiles.

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