Metallicity evolution of direct collapse black hole hosts: CR7 as a case study
In this study, we focus on the z ∼ 6.6 Lyman α CR7 consisting of clump A, which is host to a potential direct collapse black hole (DCBH), and two metal-enriched star-forming clumps B and C. In contrast to claims that signatures of metals rule out the existence of DCBHs, we show that metal pollution...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2017 March 30
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| In: |
Monthly notices of the Royal Astronomical Society
Year: 2017, Volume: 469, Issue: 1, Pages: 231-236 |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stx794 |
| Online Access: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stx794 Verlag, kostenfrei, Volltext: https://academic.oup.com/mnras/article/469/1/231/3096002 
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| Author Notes: | Bhaskar Agarwal, Jarrett L. Johnson, Sadegh Khochfar, Eric Pellegrini, Claes-Erik Rydberg, Ralf S. Klessen and Pascal Oesch |
| Summary: | In this study, we focus on the z ∼ 6.6 Lyman α CR7 consisting of clump A, which is host to a potential direct collapse black hole (DCBH), and two metal-enriched star-forming clumps B and C. In contrast to claims that signatures of metals rule out the existence of DCBHs, we show that metal pollution of A from star-forming clumps B and C is inevitable, and that A can form a DCBH well before its metallicity exceeds the critical threshold of $$10^{-5}\text{--}10^{-6}\ \rm Z_{{\odot }}$$. Assuming that metal mixing happens instantaneously, we derive the metallicity of A based on the star formation history of B and C. We find that treating a final accreting BH of 106-107 M⊙ in A for nebular emission already pushes its H160 − [3.6] and [3.6] − [4.5] colours into the 3σ limit of observations. Hence, we show that the presence of metals in DCBH hosts is inevitable, and that it is the coevolution of the Lyman-Werner radiation field and metals originating from neighbouring galaxies that governs DCBH formation in neighbouring initially pristine atomic cooling haloes. |
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| Item Description: | Gesehen am 14.12.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1365-2966 |
| DOI: | 10.1093/mnras/stx794 |