J/A+A/297/28 J/A+A/297/28 Dynamics in E+E pairs of galaxies P Bonfanti R Rampazzo F Combes P Prugniel J W Sulentic Astron. Astrophys. 297 28 1995 1995A&A...297...28B galaxies: elliptical and lenticular, cD galaxies: individual (NGC 2672, NGC 2673) galaxies: individual (NGC 741, NGC 742, NGC 1587, NGC 1588) galaxies: interactions galaxies: kinematics and dynamics We present a kinematic study of three E+E galaxy pairs, NGC 741/742, 1587/1588 (CPG 99) and 2672/2673 (CPG 175). All three pairs show a similar morphological distortion (i.e. the off-centering of inner versus outer isophotes; Davoust & Prugniel 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 Apx^-1^. NGC 741 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 minor 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 dispersion 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.

NGC NGC name --- P.A. Position angle deg Radius Radius arcsec V(r) Velocity as function of radius km/s e_V(r) rms uncertainty on V(r) km/s sigma_V(r) Velocity dispersion as function of radius km/s e_sigma_V(r) rms uncertainty on sigma_V km/s Patricia Bauer CDS 1994Oct20 J_A+A_297_28.xml