Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/27232
Titolo: | Supermassive star formation with non-LTE primordial-gas chemistry | Autori: | Sugimura, K. Coppola, C. M. Omukai, K. GALLI, Daniele Palla, F. |
Data pubblicazione: | 2017 | Rivista: | MEMORIE DELLA SOCIETA ASTRONOMICA ITALIANA | Numero: | 88 | Da pagina:: | 860 | 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. | URI: | http://hdl.handle.net/20.500.12386/27232 | URL: | http://sait.oat.ts.astro.it/MmSAI/88/PDF/860.pdf http://sait.oat.ts.astro.it/MSAIt880417/index.html |
ISSN: | 0037-8720 | Bibcode ADS: | 2017MmSAI..88..860S | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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