2016A&A...588A..76S


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.18CEST09:36:06

2016A&A...588A..76S - Astronomy and Astrophysics, volume 588A, 76-76 (2016/4-1)

Warp evidence in precessing galactic bar models.

SANCHEZ-MARTIN P., ROMERO-GOMEZ M. and MASDEMONT J.J.

Abstract (from CDS):

Most galaxies have a warped shape when they are seen edge-on. The reason for this curious form is not completely known so far, so in this work we apply dynamical system tools to contribute to its explanation. Starting from a simple, but realistic model formed by a bar and a disc, we study the effect of a small misalignment between the angular momentum of the system and its angular velocity. To this end, a precession model was developed and considered, assuming that the bar behaves like a rigid body. After checking that the periodic orbits inside the bar continue to be the skeleton of the inner system even after inflicting a precession to the potential, we computed the invariant manifolds of the unstable periodic orbits departing from the equilibrium points at the ends of the bar to find evidence of their warped shapes. As is well known, the invariant manifolds associated with these periodic orbits drive the arms and rings of barred galaxies and constitute the skeleton of these building blocks. Looking at them from a side-on viewpoint, we find that these manifolds present warped shapes like those recognised in observations. Lastly, test particle simulations have been performed to determine how the stars are affected by the applied precession, this way confirming the theoretical results.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: kinematics and dynamics - galaxies: structure - 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 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5164 1
2 NAME GB 1 GiG 07 11 22.540 +71 50 10.94   13.1       ~ 62 0
3 NGC 3344 EmG 10 43 31.150 +24 55 19.99 10.38 10.54 9.86 9.71   ~ 344 1
4 UGC 7170 GiC 12 10 36.954 +18 49 40.10   15.2       ~ 74 0
5 ESO 510-13 EmG 13 55 04.358 -26 46 50.45   13.37   11.81   ~ 35 0
6 NGC 5560 GiP 14 20 04.497 +03 59 33.55 13.38 13.20 12.37     ~ 109 1

    Equat.    Gal    SGal    Ecl

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2020.09.18-09:36:06

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