TY - JOUR
T1 - Supermassive star formation with non-LTE primordial-gas chemistry
AU - Sugimura, K.
AU - Coppola, C. M.
AU - Omukai, K.
AU - Galli, D.
AU - Palla, F.
N1 - Funding Information:
Acknowledgements. KS would like to thank the organizers of the conference. This work is supported in part by MEXT/JSPS KAKENHI Grant Number 15J03873 (KS). Finally, KS would like to thank Francesco Palla for encouraging me with his deep insight and warm personality.
Publisher Copyright:
© SAIt 2017.
PY - 2017
Y1 - 2017
N2 - 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 H2 cooling is totally suppressed by strong external radiation. Here, we obtain the critical FUV specific intensity Jcr21 (in units of 10-21erg 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 Jcr21 ∼ 1000 for the hard spectra of young and metal-poor galaxies, considered as typical radiation sources in the early Universe.
AB - 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 H2 cooling is totally suppressed by strong external radiation. Here, we obtain the critical FUV specific intensity Jcr21 (in units of 10-21erg 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 Jcr21 ∼ 1000 for the hard spectra of young and metal-poor galaxies, considered as typical radiation sources in the early Universe.
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M3 - Conference article
AN - SCOPUS:85045883639
SN - 1824-016X
VL - 88
SP - 860
EP - 861
JO - Memorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society
JF - Memorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society
IS - 4
T2 - 2017 Conference Francesco's Legacy: Star Formation in Space and Time
Y2 - 5 June 2017 through 9 June 2017
ER -