Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-01
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures, accepted by ApJ. Some minor changes are maid
Scientific paper
10.1086/525037
The ``galactic shocks'' \citep{fujimoto68,roberts69} is investigated using a full three-dimensional hydrodynamic simulations, taking into account self-gravity of the ISM, radiative cooling, and star formation followed by energy feedback from supernovae. This is an essential progress from the previous numerical models, in which 2-D isothermal, non-self-gravitating gas is assumed. We find that the classic galactic shocks appears is unstable and transient, and it shifts to a globally quasi-steady, inhomogeneous pattern due to non-linear development of instabilities in the disk. The spiral patterns consists of many GMC-like dense condensations, but those local structures are not steady, and they evolves into irregular spurs in the inter-arm regions. Energy feedback from supernovae do not destroy the quasi-steady spiral arms, but it mainly contributes to vertical motion and structures of the ISM.
No associations
LandOfFree
Instabilities of Spiral Shocks -- II. A quasi-steady State in the multi-phase inhomogeneous ISM 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 Instabilities of Spiral Shocks -- II. A quasi-steady State in the multi-phase inhomogeneous ISM, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Instabilities of Spiral Shocks -- II. A quasi-steady State in the multi-phase inhomogeneous ISM will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-6705