Black hole formation in primordial galaxies: chemical and radiative conditions
In massive primordial galaxies, the gas may directly collapse and form a single central massive object if cooling is suppressed. H2 line cooling can be suppressed in the presence of a strong soft-ultraviolet radiation field, but the role played by other cooling mechanisms is less clear. In optically...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2010 March 3
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| In: |
The astrophysical journal. Part 2, Letters
Year: 2010, Volume: 712, Issue: 1, Pages: L69-L72 |
| ISSN: | 2041-8213 |
| DOI: | 10.1088/2041-8205/712/1/L69 |
| Online Access: | Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1088/2041-8205/712/1/L69 Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.1088/2041-8205/712/1/L69 
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| Author Notes: | Dominik R.G. Schleicher, Marco Spaans, Simon C.O. Glover |
| Summary: | In massive primordial galaxies, the gas may directly collapse and form a single central massive object if cooling is suppressed. H2 line cooling can be suppressed in the presence of a strong soft-ultraviolet radiation field, but the role played by other cooling mechanisms is less clear. In optically thin gas, Lyα cooling can be very effective, maintaining the gas temperature below 104 K over many orders of magnitude in density. However, the large neutral hydrogen column densities present in primordial galaxies render them highly optically thick to Lyα photons. In this paper, we examine in detail the effects of the trapping of these Lyα photons on the thermal and chemical evolution of the gas. We show that despite the high optical depth in the Lyman series lines, cooling is not strongly suppressed, and proceeds via other atomic hydrogen transitions. |
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| Item Description: | Gesehen am 13.06.2023 |
| Physical Description: | Online Resource |
| ISSN: | 2041-8213 |
| DOI: | 10.1088/2041-8205/712/1/L69 |