1999A&A...345..787F


Query : 1999A&A...345..787F

1999A&A...345..787F - Astronomy and Astrophysics, volume 345, 787-812 (1999/5-3)

3D self-consistent N-body barred models of the Milky Way. II. Gas dynamics.

FUX R.

Abstract (from CDS):

The gas dynamics in the Galactic disc is modeled by releasing an initially axisymmetric SPH component in a completely self-consistent and symmetry-free 3D N-body simulation of the Milky Way in which the stellar components display a COBE-like bar. The density centre of the stellar bar wanders around the centre of mass and the resulting gas flow is asymmetric and non-stationary, reproducing the HI and CO l-V diagrams only at specific times and thus suggesting a transient nature of the observed inner gas kinematics. The best matching models allow a new and coherent interpretation of the main features standing out of the l-V data within the bar region. In particular, the l-V traces of the prominent offset dustlanes leading the bar major axis in early-type barred spirals can be unambiguously identified, and the 3-kpc arm and its non-symmetric galactocentric opposite counterarm are the inner prolongations of disc spiral arms passing round the bar and joining the dustlanes at very different galactocentric distances. Bania's clump 1 and 2, and another velocity-elongated feature near l= 5.5°, are interpreted as gas lumps crossing the dustlane shocks. The terminal velocity peaks near l=±2.5° are produced by gas along the dustlanes and not by the trace of the cusped x1 orbit, which passes farther away from the Galactic centre. According to these models and to related geometrical constraints, the Galactic bar must have an inclination angle of 25°±4°, a corotation radius of 4.0-4.5kpc and a face-on axis ratio b/a≃0.6.

Abstract Copyright:

Journal keyword(s): Galaxy: structure - Galaxy: kinematics and dynamics - ISM: kinematics and dynamics - Galaxy: center - hydrodynamics - methods: numerical

Simbad objects: 15

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Number of rows : 15
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 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1639 2
2 NGC 1433 GiG 03 42 01.4847418992 -47 13 18.929092656   10.84 9.99 9.61 10.2 ~ 339 0
3 NGC 1530 G 04 23 27.102 +75 17 44.05   13.40       ~ 265 1
4 NGC 3095 GiG 10 00 05.8037684890 -31 33 09.714480192   12.45 11.58 12.2 11.7 ~ 85 0
5 NGC 3485 AGN 11 00 02.3705905728 +14 50 29.983054596   12.8       ~ 114 0
6 NGC 4593 Sy1 12 39 39.4435107024 -05 20 39.034988448   13.95 13.15     ~ 1011 0
7 NGC 5921 G 15 21 56.561 +05 04 13.94   12.7       ~ 267 0
8 RAFGL 5376 IR 17 42 31.6 -29 09 35           ~ 17 0
9 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12906 0
10 NGC 6621 G 18 12 55.276 +68 21 48.50   13.6       ~ 116 1
11 UGC 11175 PaG 18 12 57.6 +68 21 32           ~ 64 0
12 NGC 6951 Sy2 20 37 14.1228088488 +66 06 20.049916392   11.64 10.65     ~ 510 2
13 NGC 7421 GiG 22 56 54.3533970816 -37 20 50.437978152 12.61 12.64 11.93 11.71 12.1 ~ 115 1
14 NGC 7479 Sy2 23 04 56.6432243448 +12 19 22.357387020 11.74 11.60 10.85 10.47 9.66 ~ 704 2
15 NAME Galactic Bar reg ~ ~           ~ 1041 0

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2022.05.24-08:58:08

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