TY - JOUR
T1 - The super-Eddington nature of supermassive stars
AU - Dotan, Calanit
AU - Shaviv, Nir J.
PY - 2012/12/21
Y1 - 2012/12/21
N2 - Supermassive stars (SMSs) are massive hydrogen objects that slowly radiate their gravitational binding energy. Such hypothetical primordial objects may have been the seed of the massive black holes (BHs) observed at the centre of galaxies. Under the standard picture, these objects can be approximately described as n = 3 polytropes, and they are expected to shine extremely close to their Eddington luminosity. Once however one considers the porosity induced by instabilities near the Eddington limit, which give rise to super-Eddington states, the standard picture should be modified. We study the structure, evolution and mass loss of these objects. We find the following. First, the evolution of SMSs is hastened due to their increased energy release. They accelerate continuum-driven winds. If there is no rotational stabilization, these winds are insufficient to evaporate the objects such that they can collapse to form supermassive BHs, however, they do prevent SMSs from emitting a copious amount of ionizing radiation. If the SMSs are rotationally stabilized, the winds evaporate the objects until a normal sub- Eddington star remains having a mass of a few × 100M⊙.
AB - Supermassive stars (SMSs) are massive hydrogen objects that slowly radiate their gravitational binding energy. Such hypothetical primordial objects may have been the seed of the massive black holes (BHs) observed at the centre of galaxies. Under the standard picture, these objects can be approximately described as n = 3 polytropes, and they are expected to shine extremely close to their Eddington luminosity. Once however one considers the porosity induced by instabilities near the Eddington limit, which give rise to super-Eddington states, the standard picture should be modified. We study the structure, evolution and mass loss of these objects. We find the following. First, the evolution of SMSs is hastened due to their increased energy release. They accelerate continuum-driven winds. If there is no rotational stabilization, these winds are insufficient to evaporate the objects such that they can collapse to form supermassive BHs, however, they do prevent SMSs from emitting a copious amount of ionizing radiation. If the SMSs are rotationally stabilized, the winds evaporate the objects until a normal sub- Eddington star remains having a mass of a few × 100M⊙.
KW - First stars
KW - Outflows - dark ages
KW - Population III - stars
KW - Reionization
KW - Stars
KW - Winds
UR - http://www.scopus.com/inward/record.url?scp=84879894132&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2012.22020.x
DO - 10.1111/j.1365-2966.2012.22020.x
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AN - SCOPUS:84879894132
SN - 0035-8711
VL - 427
SP - 3071
EP - 3080
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -