2002A&A...396...73W


Query : 2002A&A...396...73W

2002A&A...396...73W - Astronomy and Astrophysics, volume 396, 73-81 (2002/12-2)

A 60 pc counter-rotating core in NGC 4621.

WERNLI F., EMSELLEM E. and COPIN Y.

Abstract (from CDS):

We present adaptive optics assisted OASIS integral field spectrography of the S0 galaxy NGC 4621. Two-dimensional stellar kinematical maps (mean velocity and dispersion) reveal the presence of a ∼60pc diameter counter-rotating core (CRC), the smallest observed to date. The OASIS data also suggests that the kinematic center of the CRC is slightly offset from the center of the outer isophotes. This seems to be confirmed by archival HST/STIS data. We also present the HST/WFPC2 V-I colour map, which exhibits a central elongated red structure, also slightly off-centered in the same direction as the kinematic centre. We then construct an axisymmetric model of NGC 4621: the two-integral distribution function is derived using the Multi-Gaussian Expansion and the Hunter & Qian (1993MNRAS.262..401H) formalisms. Although the stellar velocities are reasonably fitted, including the region of the counter-rotating core, significant discrepancies between the model and the observations demonstrate the need for a more general model (e.g. a three-integral model).

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: individual: NGC 4621 - galaxies: formation - galaxies: kinematics and dynamics - galaxies: nuclei

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11792 1
2 * 39 Cnc * 08 40 06.4182853944 +20 00 28.034963316 8.20 7.37 6.39 5.67 5.20 G8+III-IIIb 182 0
3 NGC 4365 GiG 12 24 28.228 +07 19 03.07   11.5       ~ 816 0
4 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1044 1
5 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6249 0
6 NGC 4589 LIN 12 37 24.9947272584 +74 11 30.861224124   12.0       ~ 272 1
7 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 673 0
8 NGC 5982 LIN 15 38 39.778 +59 21 21.21   12.4       ~ 284 0
9 IC 1459 GiP 22 57 10.6071797352 -36 27 43.992307260   10.96 11.85 9.34 10.3 ~ 599 2

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2022.05.21-10:36:22

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