2001A&A...368...52E


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST07:47:23

2001A&A...368...52E - Astronomy and Astrophysics, volume 368, 52-63 (2001/3-2)

Dynamics of embedded bars and the connection with AGN. I. ISAAC/VLT stellar kinematics.

EMSELLEM E., GREUSARD D., COMBES F., FRIEDLI D., LEON S., PECONTAL E. and WOZNIAK H.

Abstract (from CDS):

We present new stellar kinematical profiles of four galaxy hosts of active galactic nuclei, using the 12CO bandhead around 2.3 µm with the ISAAC/VLT spectrograph. We find that the nuclear bars or discs, embedded in large-scale primary bars, have all a decoupled kinematics, in the sense that the maximum of the rotational velocity occurs in the nuclear region. In three cases (NGC 1097, NGC 1808 and NGC 5728), the velocity dispersion displays a significant drop at the nucleus, a rarely observed phenomenon. We also detect kinematical asymmetries (m=1 mode) along the nuclear bar major-axis of NGC 1808 and NGC 5728, dynamical counterparts of corresponding asymmetries in the surface brightness. We have derived simple dynamical models in an attempt to fit the kinematics of each galaxy and reconstruct the full velocity field. For all four targets, the fits are good, and confirm the presence of the decoupled nuclear components. These models cannot however reproduce the observed central drop in the dispersion. We suggest that this drop is due to a transient cold nuclear disc, fuelled by gas inflow along the bar, that has recently formed new stars.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: Seyfert - galaxies: evolution - galaxies: spiral

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 16492 * 02 37 44.5644832986 -34 32 17.646104360   10.21 9.00     K2III 8 0
2 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1178 3
3 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1532 2
4 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 653 3
5 NGC 5728 Sy2 14 42 23.928 -17 15 11.41   14.34 13.40     ~ 499 0
6 NGC 6503 LIN 17 49 26.4206717057 +70 08 39.587370580 11.56 10.95 10.28 9.92   ~ 471 1

    Equat.    Gal    SGal    Ecl

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2020.08.14-07:47:23

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