The Formation and Fragmentation of Primordial Molecular Clouds

Details The Formation and Fragmentation of Primordial Molecular Clouds The Formation and Fragmentation of Primordial Molecular Clouds

2000-02-07

arxiv.org/abs/astro-ph/0002135v1

Astron.Astrophys. 540 (2000) 39-44

Astronomy and Astrophysics

Astrophysics

9 pages, 3 figures, ApJ in press

Scientific paper

10.1086/309295

Many questions in physical cosmology regarding the thermal history of the intergalactic medium, chemical enrichment, reionization, etc. are thought to be intimately related to the nature and evolution of pregalactic structure. In particular the efficiency of primordial star formation and the primordial IMF are of special interest. We present results from high resolution three--dimensional adaptive mesh refinement simulations that follow the collapse of primordial molecular clouds and their subsequent fragmentation within a cosmologically representative volume. Comoving scales from 128 kpc down to 1 pc are followed accurately. Dark matter dynamics, hydrodynamics and all relevant chemical and radiative processes (cooling) are followed self-consistently for a cluster normalized CDM structure formation model. Primordial molecular clouds with ~10^5 solar masses are assembled by mergers of multiple objects that have formed hydrogen molecules in the gas phase with a fractional abundance of ~10^-4. As the subclumps merge cooling lowers the temperature to ~200 Kelvin in a `cold pocket' at the center of the halo. Within this cold pocket, a quasi-hydrostatically contracting core with ~200 solar mass and number densities > 10^5 cm^-3 is found. We find that less than 1% of the primordial gas in such small scale structures cools and collapses to sufficiently high densities to be available for primordial star formation. Furthermore, it is worthwhile to note that this study achieved the highest dynamic range covered by structured adaptive mesh techniques in cosmological hydrodynamics to date.

Affiliated with

Also associated with

No associations

Rating

The Formation and Fragmentation of Primordial 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 The Formation and Fragmentation of Primordial Molecular Clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Formation and Fragmentation of Primordial Molecular Clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-608477