scholarly journals Evidence of a dynamically evolving Galactic warp

2020 ◽  
Vol 4 (6) ◽  
pp. 590-596 ◽  
Author(s):  
E. Poggio ◽  
R. Drimmel ◽  
R. Andrae ◽  
C. A. L. Bailer-Jones ◽  
M. Fouesneau ◽  
...  
Keyword(s):  
Galactic Warp

scholarly journals Is High-Velocity Cloud Complex C Associated with the Galactic Warp?

2003 ◽  
Vol 20 (3) ◽  
pp. 263-269 ◽  
Author(s):  
Daisuke Kawata ◽  
Christopher Thom ◽  
Brad K. Gibson
Keyword(s):  
High Latitude ◽  
High Velocity ◽  
Large Magellanic Cloud ◽  
Alternative Interpretation ◽  
North Polar ◽  
Gas Cloud ◽  
Cloud Complex ◽  
Galactic Warp ◽  
Velocity Cloud ◽  
Spiral Arm

AbstractWe test the hypothesis that high-velocity gas cloud Complex C is actually a high-latitude spiral arm extension in the direction of the Galactic warp, as opposed to the standard interpretation — that of a once extragalactic, but now infalling, gas cloud. A parallel Tree N-body code was employed to simulate the tidal interaction of a satellite perturber with the Milky Way. We find that a model incorporating a perturber of the mass of the Large Magellanic Cloud on a south to north polar orbit, crossing the disk at ˜15 kpc, does yield a high-velocity, high-latitude extension consistent with the spatial, kinematical, and column density properties of Complex C. Unless this massive satellite remains undiscovered because of either a fortuitous alignment with the Galactic bulge (feasible within the framework of the model), or the lack of any associated baryonic component, we conclude that this alternative interpretation appears unlikely.

The Galactic warp as seen from 2MASS survey

2008 ◽  
Vol 329 (9-10) ◽  
pp. 1012-1017 ◽  
Author(s):  
A.C. Robin ◽  
C. Reylé ◽  
D.J. Marshall
Keyword(s):  
Galactic Warp

scholarly journals On the Kinematic Signature of the Galactic Warp As Revealed By the LAMOST-TGAS Data

2018 ◽  
Vol 864 (2) ◽  
pp. 129 ◽  
Author(s):  
Y. Huang ◽  
R. Schönrich ◽  
X.-W. Liu ◽  
B.-Q. Chen ◽  
H.-W. Zhang ◽  
...  
Keyword(s):  
Galactic Warp

scholarly journals Vertical structure and kinematics of the Galactic outer disk

2019 ◽  
Vol 72 (4) ◽  
Author(s):  
Nobuyuki Sakai ◽  
Takumi Nagayama ◽  
Hiroyuki Nakanishi ◽  
Nagito Koide ◽  
Tomoharu Kurayama ◽  
...  
Keyword(s):  
Dwarf Galaxy ◽  
Oscillatory Behavior ◽  
Maximum Height ◽  
Galactocentric Distance ◽  
The North ◽  
Vertical Density ◽  
Galactic Longitude ◽  
Maser Sources ◽  
Galactic Warp ◽  
North Galactic

Abstract We report on measurements of parallax and proper motion for four 22 GHz water maser sources as part of the VERA Outer Rotation Curve project. All the sources show Galactic latitudes of >2° and Galactocentric distances of >11 kpc at the Galactic longitude range of 95° < l < 126°. The sources trace the Galactic warp reaching to 200–400 pc, and also the signature of the warp to 600 pc toward the north Galactic pole. The new results, along with previous results in the literature, show that the maximum height of the Galactic warp increases with Galactocentric distance. Also, we examined velocities perpendicular to the disk for the sample, and found oscillatory behavior between the vertical velocities and Galactic heights. This behavior suggests the existence of bending (vertical density) waves, possibly induced by a perturbing satellite (e.g., the passage of the Sagittarius dwarf galaxy).

scholarly journals Probing the Canis Major stellar over-density as due to the Galactic warp

2004 ◽  
Vol 421 (2) ◽  
pp. L29-L32 ◽  
Author(s):  
Y. Momany ◽  
S. R. Zaggia ◽  
P. Bonifacio ◽  
G. Piotto ◽  
F. De Angeli ◽  
...  
Keyword(s):  
Galactic Warp

scholarly journals Outer structure of the Galactic warp and flare: explaining the Canis Major over-density

2006 ◽  
Vol 451 (2) ◽  
pp. 515-538 ◽  
Author(s):  
Y. Momany ◽  
S. Zaggia ◽  
G. Gilmore ◽  
G. Piotto ◽  
G. Carraro ◽  
...  
Keyword(s):  
Galactic Warp

scholarly journals An Unbiased Search for Molecular Clouds in the Southern Galactic Warp

2005 ◽  
Vol 57 (6) ◽  
pp. 917-931 ◽  
Author(s):  
Masanori Nakagawa ◽  
Toshikazu Onishi ◽  
Akira Mizuno ◽  
Yasuo Fukui
Keyword(s):  
Molecular Clouds ◽  
Galactic Warp

Warps, Waves, and Phase Spirals in the Milky Way

2019 ◽  
Vol 14 (S353) ◽  
pp. 65-70
Author(s):  
Lawrence M. Widrow ◽  
Keir Darling ◽  
Haochuan Li
Keyword(s):  
Milky Way ◽  
Dynamic Mode Decomposition ◽  
Galactic Centre ◽  
Dynamic Mode ◽  
Vertical Force ◽  
Disc Galaxy ◽  
Stellar Disc ◽  
Mode Decomposition ◽  
Number Counts ◽  
Galactic Warp

AbstractThe stellar disc of the Milky Way exhibits clear departures from planarity, the most conspicuous manifestation being the Galactic Warp but also includes an apparent corrugation pattern in number counts around 15kpc from the Galactic centre, a wave like pattern in the vertical velocities of stars as a function of guiding radius, asymmetries about the midplane in both number counts and bulk motions, and phase spirals in the z–vz projection of the local stellar distribution function. We discuss the physics of these phenomena and, in particular, suggest a possible avenue for inferring the vertical force in the Solar Neighbourhood from phase spirals. We apply Dynamic Mode Decomposition, a technique widely used in the realm of fluid mechanics, to simulations of disc galaxy simulations. This method appears to be particularly well-suited to the study of nonlinear processes such as the coupling of warps and spirals, first discussed by Masset and Tagger.

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