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Ring and Lens Formation
1996
International Astronomical Union Colloquium
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AbstractThe dynamical mechanism to form rings at Lindblad resonances in a barred galaxy is now well-known: due to its dissipative character, the gas is forced in a spiral structure, and experiences torques ...
We propose here that lenses are the result of partial bar destruction, a necessary step in a feedback cycle of bar formation-destruction, a cycle driven by gas accretion. ...
Current views of the ISM are therefore based on self-similar structures, a hierarchy of clouds over several orders of magnitude in scale (Falgarone et Combes al. 1992; Pfenniger k Combes 1994) . ...
doi:10.1017/s0252921100049927
fatcat:4fvwv2mhzzegjh6td7er7lsac4
Gaseous flows in galaxies
2007
Proceedings of the International Astronomical Union
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The gas component plays a major role in the dynamics of spiral galaxies, because of its dissipative character, and its ability to exchange angular momentum with stars in the disk. ...
The various time-scales of these gaseous flows are described. ...
Combes . The data points are from the HI kinematics (Laine et al. 1998a ), and the model circular velocity has been fitted to them. ...
doi:10.1017/s1743921308017535
fatcat:sdhuesfxe5divle5xm4jcx24ay
A dynamo model for the magnetic field of the weakly barred galaxy IC 4214
1999
Monthly notices of the Royal Astronomical Society
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A B S T R A C T IC 4214 is a weakly barred galaxy, the observed velocity field of which has been well modelled by a dynamical simulation. ...
We take the velocity field from this simulation as being representative of that to be found in a class of barred spiral galaxies, and use it as input into a galactic dynamo model. ...
Their general properties have been modelled by various gas dynamical simulations using analytical or numerical potentials (Schwarz 1981; Combes & Gerin 1985; Byrd et al. 1994) . ...
doi:10.1046/j.1365-8711.1999.02191.x
fatcat:56drt3zm7rcvdpwqsv5rnerdee
Magnetohydrodynamical non-radiative accretion flows in two dimensions
2001
Monthly notices of the Royal Astronomical Society
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The two-dimensional structure of the time-averaged flow is significantly different compared to the hydrodynamical case. ...
We discuss the limitations imposed on our results by the assumption of axisymmetry and the relatively small radial domain. ...
RESULTS
A Fiducial Model The effect of numerical resolution on the nonlinear stage of the MRI has been examined in a variety of local studies (e.g. HGB). ...
doi:10.1046/j.1365-8711.2001.04138.x
fatcat:a3w7b3loynhczfjibbgkujhd5a
AGN activity and nuclear starbursts: Sgr A* activity shapes the Central Molecular Zone
[article]
2015
arXiv
pre-print
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In this paper, I use SPH simulations to show that most of these properties can be explained as due to a recent outburst of AGN activity in Sgr A*, the central supermassive black hole of the Milky Way. ...
The Central Molecular Zone (CMZ) of the Milky Way shows several peculiar properties: a large star formation rate, some of the most massive young star clusters and molecular clouds in the Galaxy, and a ...
This is a stochastic process, so I turn to numerical simulations to investigate the properties of the structures forming in a perturbed CMZ. ...
arXiv:1505.05464v1
fatcat:xzf6dp3manhlfigcjah6jxbh3i
Hydrodynamical simulations of Galactic fountains – I. Evolution of single fountains
2008
Monthly notices of the Royal Astronomical Society
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2008 pre-print arXiv:0805.1138v1 fatcat:jlfbvt56tra3xmsy43xhconidy
This localized circulation of disk gas does not influence the radial chemical gradients on large scale, as required by the chemical models of the Milky Way which reproduce the metallicity distribution ...
To this aim, we performed a number of 3D hydrodynamical radiative cooling simulations of the gas in the Milky Way where the whole Galaxy structure, the Galactic differential rotation and the supernovae ...
E.M.G.D.P. also acknowledges the partial support from grants of the Brazilian Agencies FAPESP and CNPq. ...
doi:10.1111/j.1365-2966.2008.13446.x
fatcat:rfiwhnci7jdgdb7skgmmokpgwi
Molecular Gas in NUclei of GAlaxies (NUGA)
2008
Astronomy and Astrophysics
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These are the beginning of two straight dust lanes, which are aligned parallel to an oval distortion, reminiscent of a primary bar, almost perpendicular to the nuclear one. ...
The CO emission is aligned along the stellar nuclear bar of radius 1 kpc, configured in an elongated structure with two spiral arms at high pitch angle. ...
This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics ...
doi:10.1051/0004-6361:20078874
fatcat:daegzlf5l5h2zgzq2djczdyxnu
Escapees from the bar resonances. Presence of low-eccentricity metal-rich stars at the solar vicinity
2020
Astronomy and Astrophysics
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Understanding radial migration is a crucial point for building relevant chemical and dynamical evolution models of the Milky Way disk. ...
Once the bar strength reaches its maximum amplitude, some of the stars delivered to the outer disk escape the resonances and some of them settle on nearly circular orbits. ...
Numerical simulations were carried by using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University supported by the project RFMEFI62117X0011. ...
doi:10.1051/0004-6361/201937188
fatcat:76dgrxskmvdc3ahe5edr5ecmm4
CHEMODYNAMIC EVOLUTION OF DWARF GALAXIES IN TIDAL FIELDS
2016
Astrophysical Journal
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We perform a series of smoothed particle hydrodynamics (SPH) simulations of dwarf galaxies in external tidal fields to examine the effects of tides on their metallicities and metallicity gradients. ...
In our simulated galaxies, gravitational instabilities drive gas inwards and produce centralized star formation and a significant metallicity gradient. ...
as even lopsided modes can drive gas inwards (Jog & Combes 2009 ). ...
doi:10.3847/0004-637x/831/1/1
fatcat:6nhbyqs7kfainl7q3qsrguulfy
A dynamical mechanism for the origin of nuclear rings
2018
Monthly notices of the Royal Astronomical Society
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2018 pre-print arXiv:1805.07969v1 fatcat:rwnripslyrae7bwmvf2tmrsjjmOther Versions
However, the fact that gas follows non circular orbits in an external barred potential has profound consequences: it creates a region of reverse shear in which it is energetically favourable to form a ...
In analogy with the standard theory of accretion discs, our theory is based on shear viscous forces among nested annuli of gas. ...
So, if everything is forced to remain on a circular orbit, the inner ring must move outwards, and the outer ring moves inwards. ...
doi:10.1093/mnras/sty2246
fatcat:lxhmofhfvrbcvkc4igmbjf4na4
Exploring spiral galaxy potentials with hydrodynamical simulations
2003
Monthly notices of the Royal Astronomical Society
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where effects like inflows due to numerical viscosity and morphological dependence on gas sound speed are less of a concern than they are in the centers of disks. ...
In particular, we show that a global least squares analysis is not the optimal method for distinguishing different models as it tends to slightly favor low disk fraction models. ...
Devriendt for a careful reading of the manuscript and are grateful to the anonymous referee for valuable comments. ...
doi:10.1111/j.1365-2966.2003.07166.x
fatcat:rkisvh6k3jhbdhlulnyznlwczi
KINEMATIC ANALYSIS OF NUCLEAR SPIRALS: FEEDING THE BLACK HOLE IN NGC 1097
2010
Astrophysical Journal
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Next, we use a simple spiral perturbation model to constrain the fraction of the measured non-circular motions that is due to radial inflow. ...
We present a harmonic expansion of the observed line-of-sight velocity field as a method to recover and investigate spiral structures in the nuclear regions of galaxies. ...
Moreover, numerical models of dust lanes (e.g., Gerssen & Debattista 2007 ) as well as analytical models of diffuse disks (e.g., Valotto & Giovanelli 2004) show that dust extinction can have a significant ...
doi:10.1088/0004-637x/723/1/767
fatcat:jcat2mmuu5ggjgj7uo7t66pcc4
Radial Gas Flows in Colliding Galaxies: Connecting Simulations and Observations
2004
Astrophysical Journal
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(abridged) We investigate the detailed response of gas to the formation of transient and long-lived dynamical structures induced in the early stages of a disk-disk collision, and identify observational ...
Non-circular gas kinematics driven by the perturbation of the non-axisymmetric structure can produce distinct emission features in the "forbidden velocity quadrants" of the position-velocity diagram (PVD ...
The numerical model and the units adopted are briefly summarized in §2. ...
doi:10.1086/424797
fatcat:zepmwnljkzc35eatib3gjh2q5i
Escapees from the bar resonances. On the presence of low-eccentricity, metal-rich stars at the Solar vicinity
[article]
2020
arXiv
pre-print
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Understanding radial migration is a crucial point to build relevant chemical and dynamical evolution models of the Milky Way disk. ...
Once the bar strength reaches its maximal amplitude, some of the stars, delivered to the outer disk, escape the resonances and some of them settle on nearly circular orbits. ...
ONS acknowledges DIM ACAV+ funding. Article number, page 8 of 9 Khoperskov et al.: Migration of inner disk stars with the bar resonances ...
arXiv:1911.12424v2
fatcat:rhvwe3a2nng5vazaouux4fxbdi
Dynamics of galaxies with triaxial haloes
1998
New Astronomy
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1998 pre-print arXiv:astro-ph/9805309v1 fatcat:jj66rul75vcpzdgxxeagqsrf4m
We study the stability of trajectories near the disk plane of galaxy models with a triaxial dark matter halo component. ...
It was found that weak discreteness noise can change the fraction of such trajectories significantly and can therefore have important consequences for the modelling of galaxies. ...
Numerical simulations based on CDM models on the other hand predict
no core radius at all, but a density increasing as 1/r in the central areas. ...
doi:10.1016/s1384-1076(98)00025-6
fatcat:q5t2t36lnbenfjut2tban4zh3i
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