Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537602c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #376.02; Bulletin of the American Astronomical Society, Vol. 42, p.584
Mathematics
Logic
1
Scientific paper
We investigate the effects of star formation (SF) models on the cosmic SF history using cosmological smoothed particle hydrodynamics (SPH) simulations based on the cold dark matter (CDM) model. We test two new SF models: 1) the `Pressure' model based on the work by Schaye & Dalla Vecchia (2008), and 2) the `Blitz' model that takes the effect of molecular hydrogen formation into account, based on the work by Blitz & Rosolowsky (2006). Compared to the previous conventional SF model, the Pressure model reduces the SFR in low-density region and shows better agreement with the observations of the Kennicutt law. Our new model also suppresses the early star formation and shift the peak of the cosmic SF history toward low redshift, more consistently with the recent observational estimates of cosmic SFR density. The simulations with the new SF model also predict lower global stellar mass densities at high redshift, larger population of low-mass galaxies and high gas fraction in high-redshift galaxies. Our results suggest that there are still rooms left in the model uncertainties to reconcile the discrepancy that was found between the theory and observations of cosmic SF history and stellar mass density. Nevertheless, our simulations still predict higher stellar mass densities than most of the observational estimates.
Choi Jun-Hwan
Nagamine Kentaro
No associations
LandOfFree
Effects Of Star Formation Models On The Cosmic Star Formation History 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 Effects Of Star Formation Models On The Cosmic Star Formation History, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effects Of Star Formation Models On The Cosmic Star Formation History will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-964112