Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4702n&link_type=abstract
American Astronomical Society Meeting 208, #47.02; Bulletin of the American Astronomical Society, Vol. 38, p.122
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the destruction of dust by sputtering in high-velocity shocks driven by population III SNe in the early universe, applying the model of dust by Nozawa et al. (2003) for initial dust in the early ISM and the hydrodymanical models of SNe by Umeda & Nomoto (2002) for initial conditions of interstellar shocks. The dynamics of dust grains and their destruction by sputtering in shocks are calculated by taking into account the size distribution of each dust species, together with the time evolution of temperature and density of gas in spherically symmetric shocks. We find that the efficiency of dust destruction by sputtering depends not only on the sputtering yield but also on the initial size distribution of each grain species; Al2O3 and MgSiO3 being populated by the smaller sized grains, the destruction efficiencies are very high, while the erosion of C, Fe and SiO2 grains with the lognormal size distribution and the average size of > 0.01 µm mainly increases the number of smaller grains and their efficiencies of destruction are relatively low. The efficiency of dust destruction increases with increasing the SN explosion energy E51 and increasing the gas density nH, 0 in the ISM, but is almost independent of the progenitor mass of SNe as long as E51 is the same. The dependences of the efficiency of destruction on E51 and n H, 0 are well reproduced by a power-law formula and by a quadratic equation in terms of \log(nH, 0), respectively. The mass of gas swept up by shock is the function of E51 and nH, 0. Combining these results, we present the approximation formula for the time-scale of destruction of each grain species in the early universe as a function of E51 and nH, 0.
Habe Asao
Kozasa Takashi
Nozawa Takaya
No associations
LandOfFree
Dust Destruction In The High-velocity Shocks Driven By Supernovae<br />In The Early Universe 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 Dust Destruction In The High-velocity Shocks Driven By Supernovae<br />In The Early Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dust Destruction In The High-velocity Shocks Driven By Supernovae<br />In The Early Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1856608