Formation of water and methanol in star forming molecular clouds

Details Formation of water and methanol in star forming molecular clouds Formation of water and methanol in star forming molecular clouds

2008-06-29

arxiv.org/abs/0806.4740v1

Astronomy and Astrophysics

Astrophysics

12 pages, 16 figures in eps format

Scientific paper

10.1051/0004-6361:20078422

We study the formation of water and methanol in the dense cloud conditions to find the dependence of its production rate on the binding energies, reaction mechanisms, temperatures, and grain site number. We wish to find the effective grain surface area available for chemical reaction and the effective recombination timescales as functions of grain and gas parameters. We used a Monte Carlo simulation to follow the chemical processes occurring on the grain surface. We find that the formation rate of various molecules is strongly dependent on the binding energies. When the binding energies are high, it is very difficult to produce significant amounts of the molecular species. Instead, the grain is found to be full of atomic species. The production rates are found to depend on the number density in the gas phase. We show that the concept of the effective grain surface area, which we introduced in our earlier work, plays a significant role in grain chemistry. We compute the abundance of water and methanol and show that the results strongly depend on the density and composition in the gas phase, as well as various grain parameters. In the rate equation, it is generally assumed that the recombination efficiencies are independent of the grain parameters, and the surface coverage. Presently, our computed parameter $\alpha$ for each product is found to depend on the accretion rate, the grain parameters and the surface coverage of the grain. We compare our results obtained from the rate equation and the one from the effective rate equation, which includes $\alpha$. At the end we compare our results with the observed abundances.

Affiliated with

Also associated with

No associations

Rating

Formation of water and methanol in star forming molecular clouds 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 Formation of water and methanol in star forming molecular clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Formation of water and methanol in star forming molecular clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-259146