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An analytic resolution to the competition between Lyman-Werner radiation and metal winds in direct collapse black hole hosts
Heidelberg Univ, Inst Theoret Phys, Zentrum Astron, Albert Ueberle Str 2, D-69120 Heidelberg, Germany..
Heidelberg Univ, Inst Theoret Phys, Zentrum Astron, Albert Ueberle Str 2, D-69120 Heidelberg, Germany.;Dublin City Univ, Sch Math Sci, Ctr Astrophys & Relat, Dublin D09 Y5N0, Ireland..
Heidelberg Univ, Inst Theoret Phys, Zentrum Astron, Albert Ueberle Str 2, D-69120 Heidelberg, Germany..
Dublin City Univ, Sch Math Sci, Ctr Astrophys & Relat, Dublin D09 Y5N0, Ireland..
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2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 470, no 4, p. 4034-4038Article in journal (Refereed) Published
Abstract [en]

A near pristine atomic cooling halo close to a star forming galaxy offers a natural pathway for forming massive direct collapse black hole (DCBH) seeds, which could be the progenitors of the z > 6 redshift quasars. The close proximity of the haloes enables a sufficient Lyman-Werner flux to effectively dissociate H-2 in the core of the atomic cooling halo. A mild background may also be required to delay star formation in the atomic cooling halo, often attributed to distant background galaxies. In this paper, we investigate the impact of metal pollution from both the background galaxies and the close star forming galaxy under extremely unfavourable conditions such as instantaneous metal mixing. We find that within the time window of DCBH formation, the level of pollution never exceeds the critical threshold (Z(cr) similar to 1 x 10(-5) Z(circle dot)) and attains a maximum metallicity of Z similar to 2 x 10(- 6) Z(circle dot). As the system evolves, the metallicity eventually exceeds the critical threshold, long after the DCBH has formed.

Place, publisher, year, edition, pages
2017. Vol. 470, no 4, p. 4034-4038
Keyword [en]
methods: numerical, dark ages, reionization, first stars, large-scale structure of Universe, cosmology: theory
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-334393DOI: 10.1093/mnras/stx1528ISI: 000408207600016OAI: oai:DiVA.org:uu-334393DiVA, id: diva2:1163901
Available from: 2017-12-08 Created: 2017-12-08 Last updated: 2017-12-08

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Zackrisson, Erik
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