Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...349..595h&link_type=abstract
Astronomy and Astrophysics, v.349, p.595-604 (1999)
Astronomy and Astrophysics
Astrophysics
2
Hydrodynamics, Molecular Data, Methods: Numerical, Ism: Clouds
Scientific paper
The interaction of shock fronts with molecular clouds is investigated. For this purpose, a two-fluid model describing an H-H_2 gas mixture is applied. The resulting equations are solved with a 2D axial-symmetric, fully compressive hydrodynamics code. Radiative cooling and the thermodynamical properties of the H_2 molecule, ie. rotational and vibrational degrees of freedom as well as thermal dissociation, are taken into account. The evolution of the shock/cloud system using this more sophisticated thermodynamical model is found to be very different from that involving a pure atomic H gas which obeys the ideal gas law. For example, the maximum density of the shocked cloud is about 5-10 times lower in the latter case. This significant result might become very important when estimating triggered star formation rates. Another difference is that in the case of H-H_2 mixture, the shocked cloud gets a comet-like structure because of a smaller reexpansion. From the numerical experiments we conclude that the application of the ideal gas law is insufficient and gives only a crude approximation of the real dynamics of a shock/cloud collision.
Horvath Andras
Ziegler Udo
No associations
LandOfFree
The influence of hydrogen molecules on shock-cloud collisions 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 The influence of hydrogen molecules on shock-cloud collisions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The influence of hydrogen molecules on shock-cloud collisions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1766103