On the possible sources of D/H dispersion at high redshift

被引:33
作者
Fields, BD
Olive, KA
Silk, J
Cassé, M
Vangioni-Flam, E
机构
[1] Univ Illinois, Dept Astron, Urbana, IL 61801 USA
[2] Univ Minnesota, Sch Phys & Astron, Inst Theoret Phys, Minneapolis, MN 55455 USA
[3] Univ Oxford, Dept Phys, Oxford OX1 3RH, England
[4] Inst Astrophys, F-75014 Paris, France
[5] CEA, Serv Astrophys, F-91191 Gif Sur Yvette, France
[6] CERN, CH-1211 Geneva 23, Switzerland
关键词
cosmic rays; galaxies : evolution; nuclear reactions; nucleosynthesis; abundances;
D O I
10.1086/323968
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent observations suggest the existence of a white dwarf population in the Galactic halo, while others suggest that deuterium has been astrated in systems at high redshift and low metallicity. We propose that these observations could be signatures of an early population of intermediate-mass stars. Such a population requires a Population III initial mass function different from that of the solar neighborhood, as perhaps also suggested by the observed cosmic infrared background. Also, to avoid overproduction of C and N, it is required that the Z=0 yields of these stars have low (similar to 10(-3) solar) abundances, as suggested by some recent calculations. Under these assumptions, we present a model that reproduces the observed D versus Si trend and predicts a high cosmic Type Ia supernova rate while producing a white dwarf population that accounts for only similar to1.5% of the dark halo. This scenario can be tested by observations of the cosmic supernova rate and by confirmation and further studies of the putative white dwarf halo population.
引用
收藏
页码:653 / 659
页数:7
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