Is the vorticity vector of the Galaxy perpendicular to the Galactic plane? II - Kinematics of the Galactic warp

Details Is the vorticity vector of the Galaxy perpendicular to the Galactic plane? II - Kinematics of the Galactic warp Is the vorticity vector of the Galaxy perpendicular to the Galactic plane? II - Kinematics of the Galactic warp

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.2138m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 6, p. 2138-2147.

Astronomy and Astrophysics

Astronomy

18

Galactic Rotation, Milky Way Galaxy, Stellar Motions, Warpage, H I Regions, Solar Neighborhood, Vorticity

Scientific paper

A warping motion inherent in the Galactic warp is detected, based on the proper motions of about 2000 young generation stars which consist of O-B5 stars, supergiants, and bright giants of any spectral type in the heliocentric distance interval 0.5 to 3.0 kpc. To examine the warping motion, the overall pattern analysis of the proper motions of these stars is performed on the basis of the 3D Ogorodnikov-Milne model instead of the classical Oort-Lindblad model. It is found that the kinematics of these stars is quite different from that of K-M giants which show only the familiar plane-parallel galactic rotation described by the 0ort constants A and B. The young generation stars as an entity of the warp show additional shears and rotations around the two mutually orthogonal axes lying in the Galactic plane, besides the classical ones around the axis perpendicular to the Galactic plane. The present finding implies that these young stars are streaming around the Galactic center in a tilted sheet (the warp) with a velocity of 225 km/s, and that the sheet itself is also rotating around the nodal line of the warp with an angular velocity of 4 km/s/kpc in increasing sense of the present inclination of the H I warp.

Affiliated with

Also associated with

No associations

Rating

Is the vorticity vector of the Galaxy perpendicular to the Galactic plane? II - Kinematics of the Galactic warp does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Is the vorticity vector of the Galaxy perpendicular to the Galactic plane? II - Kinematics of the Galactic warp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Is the vorticity vector of the Galaxy perpendicular to the Galactic plane? II - Kinematics of the Galactic warp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1734624