Physics
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...681...96h&link_type=abstract
The Astrophysical Journal, Volume 681, Issue 1, pp. 96-103.
Physics
4
Accretion, Accretion Disks, Black Hole Physics, Galaxies: Jets, Hydrodynamics, Ism: Jets And Outflows
Scientific paper
Nucleosynthesis could take place in the hot regions of accretion and outflow around a black hole. We here investigate possible composition changes due to nuclear reaction processes in an accretion disk by calculating a set of self-similar solutions of an advection-dominated accretion flow. We find that 26Al, 51Cr, 53Mn, and 55Fe produced in the accretion flow with a heating factor f=0.001 are significantly overabundant compared to solar abundances, and could contribute to metal-contaminated galaxies. We find a richness of protons and neutrons due to photodisintegration in very hot flows. We also discuss nucleosynthesis in outflow regions via an expansion burning reaction process; the abundances of some species could increase further due to such nuclear reactions. A possible new origin of 26Al, which depends on the quantity of stellar-mass black holes and the mass of the host galaxy, is also discussed.
Hu Tao
Peng Qiu-he
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