Supermassive star formation with non-LTE primordial-gas chemistry

Journal
Date Issued
2017
Author(s)
Sugimura, K.
•
Coppola, C. M.
•
Omukai, K.
•
•
Palla, F.
Abstract
The remnant black holes (BHs) of supermassive stars formed at z > 10 are promising candidates of the seeds for supermassive BHs. They are thought to form in pristine atomic cooling halos in which H_2 cooling is totally suppressed by strong external radiation. Here, we obtain the critical FUV specific intensity J21(cr) (in units of 10-21 erg s-1 Hz-1 sr-1 cm-2) required for supermassive star formation, with non-local thermodynamic equilibrium (non-LTE) primordial-gas chemistry. We consider the non-LTE chemistry with the vibrationally resolved H_2+ kinetics, as well as realistic radiation spectra of galaxies. We find that while the effect of non-LTE H_2+ chemistry is important for soft radiation sources, it is negligible and J21(cr) ∼ 1000 for the hard spectra of young and metal-poor galaxies, considered as typical radiation sources in the early Universe.
Volume
88
Start page
860
Uri
Url
Issn Identifier
0037-8720
Ads BibCode
2017MmSAI..88..860S
Rights
open.access
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