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Formation of an embryonic supermassive star in the first galaxy
| Title: | Formation of an embryonic supermassive star in the first galaxy |
| Authors: | Inayoshi, Kohei Browse this author | | Omukai, Kazuyuki Browse this author | | Tasker, Elizabeth Browse this author |
| Keywords: | stars: formation | | quasars: supermassive black holes | | cosmology: theory | | dark ages | | reionization | | first stars |
| Issue Date: | 21-Nov-2014 |
| Publisher: | Oxford University Press |
| Journal Title: | Monthly notices of the Royal Astronomical Society |
| Volume: | 445 |
| Issue: | 1 |
| Start Page: | L109 |
| End Page: | L113 |
| Publisher DOI: | 10.1093/mnrasl/slu151 |
| Abstract: | We studied the gravitational collapse of a warm (similar to 8000 K) primordial-gas cloud as a candidate progenitor for a supermassive star (SMS; a parts per thousand(3) 10(5) M-aS (TM)) using a three-dimensional hydrodynamical simulation including all the relevant cooling processes of both H-2 and H, which can potentially induce cloud fragmentation. This is the first simulation of this kind to resolve protostar formation. We find that from a weakly turbulent initial condition, the cloud undergoes runaway collapse without a major episode of fragmentation. Although the H-2 fraction jumps by a large factor via the three-body reaction at similar to 10(-13) g cm(-3), its cooling remains inefficient due to the optical thickness, and the temperature remains a parts per thousand(3) 3000 K. When the central core of the cloud becomes opaque to continuum radiation at similar to 10(-8) g cm(-3), a hydrostatic protostar with a parts per thousand integral 0.2 M-aS (TM) is formed. The protostar grows to the mass a parts per thousand integral 1 M-aS (TM) and the radius a parts per thousand integral 2 au within similar to 1 yr via rapid accretion of dense filamentary flows. With high accretion rate, similar to 2 M-aS (TM) yr(-1), the protostar is expected to turn into an SMS within its lifetime, eventually collapsing to a seed for the supermassive black hole observed in the early Universe at z similar to 7. |
| Rights: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/57652 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: Elizabeth Jane Tasker
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