How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk?

Details How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk? How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk?

2008-01-21

arxiv.org/abs/0801.3186v2

Astrophys.J. 682 (2008) 434-444

Astronomy and Astrophysics

Astrophysics

Revised the manuscript and added references, 23 pages with 9 figures

Scientific paper

10.1086/589556

The unusual mushroom-shaped HI cloud, GW 123.4--1.5, is hundreds of parsecs in size but does not show any correlations to HI shells or chimney structures. To investigate the origin and velocity structure of GW 123.4--1.5, we perform three-dimensional hydrodynamical simulations of the collision of a high-velocity cloud with the Galactic disk. We also perform a parameter study of the density, radius, and incident angle of the impact cloud. The numerical experiments indicate that we reproduce the mushroom-shaped structure which resembles GW 123.4--1.5 in shape, size, position-velocity across the cap of the mushroom, and the density ratio between the mushroom and surrounding gas. GW 123.4--1.5 is expected to be formed by the almost head-on collision of a HVC with velocity $\sim 100 \kms$ and mass $\sim 10^5 \Msun$ about $5 \times 10^7 \yr$ ago. A mushroom-shaped structure like GW 123.4--1.5 must be infrequent on the Galactic plane, because the head-on collision which explains the mushroom structure seems rare for observed HVCs. HVC-disk collision explains not only the origin of the mushroom-shaped structure but also the formation of a variety of structures like shells, loops, and vertical structures in our Galaxy.

Affiliated with

Also associated with

No associations

Rating

How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk? 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 How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and How was the mushroom-shaped GW 123.4--1.5 formed in the Galactic disk? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-594199