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J/A+A/297/28 Dynamics in E+E pairs of galaxies (Bonfanti+, 1995)
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Stellar dynamics in E+E pairs of galaxies. I. NGC 741/742, 1587/88 and 2672/73.
The data.
Bonfanti P., Rampazzo R., Combes F., Prugniel P., Sulentic J.W.
<Astron. Astrophys. 297, 28 (1995)>
=1995A&A...297...28B (SIMBAD/NED Reference)
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ADC_Keywords: Galaxies, spectra; Radial velocities
Keywords: galaxies: individual:NGC 741/2, 1587/8, 2672/3 -
galaxies: kinematics and dynamics - galaxies: elliptical -
galaxies: interaction
Abstract:
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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 43 237 Kinematic data
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- NGC NGC name
13- 15 I3 deg P.A. Position angle
18- 22 F5.1 arcsec Radius Radius
25- 28 I4 km/s V(r) Velocity as function of radius
32- 33 I2 km/s e_V(r) rms uncertainty on V(r)
37- 39 I3 km/s sigma_V(r) []? Velocity dispersion as function of radius
42- 43 I2 km/s e_sigma_V(r) []? rms uncertainty on sigma_V
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(End) Patricia Bauer [CDS] 20-Oct-1994