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research
Magnetic fields in primordial accretion disks
Authors
Muhammad A. Latif
Dominik R. G. Schleicher
Publication date
4 November 2015
Publisher
'EDP Sciences'
Doi
Cite
View
on
arXiv
Abstract
Magnetic fields are considered as a vital ingredient of contemporary star formation, and may have been important during the formation of the first stars in the presence of an efficient amplification mechanism. Initial seed fields are provided via plasma fluctuations, and are subsequently amplified by the small-scale dynamo, leading to a strong tangled magnetic field. Here we explore how the magnetic field provided by the small-scale dynamo is further amplified via the
α
−
Ω
\alpha-\Omega
α
−
Ω
dynamo in a protostellar disk and assess its implications. For this purpose, we consider two characteristic cases, a typical Pop.~III star with
10
10
10
~M
⊙
_\odot
⊙
​
and an accretion rate of
1
0
−
3
10^{-3}
1
0
−
3
~M
⊙
_\odot
⊙
​
~yr
−
1
^{-1}
−
1
, and a supermassive star with
1
0
5
10^5
1
0
5
~M
⊙
_\odot
⊙
​
and an accretion rate of
1
0
−
1
10^{-1}
1
0
−
1
~M
⊙
_\odot
⊙
​
~yr
−
1
^{-1}
−
1
. For the
10
10
10
~M
⊙
_\odot
⊙
​
Pop.~III star, we find that coherent magnetic fields can be produced on scales of at least
100
100
100
~AU, which are sufficient to drive a jet with a luminosity of
100
100
100
~L
⊙
_\odot
⊙
​
and a mass outflow rate of
1
0
−
3.7
10^{-3.7}
1
0
−
3.7
~M
⊙
_\odot
⊙
​
~yr
−
1
^{-1}
−
1
. For the supermassive star, the dynamical timescales in its environment are even shorter, implying smaller orbital timescales and an efficient magnetization out to at least
1000
1000
1000
~AU. The jet luminosity corresponds to
∼
1
0
6.0
\sim10^{6.0}
∼
1
0
6.0
~L
⊙
_\odot
⊙
​
, and a mass outflow rate of
1
0
−
2.1
10^{-2.1}
1
0
−
2.1
~M
⊙
_\odot
⊙
​
~yr
−
1
^{-1}
−
1
. We expect that the feedback from the supermassive star can have a relevant impact on its host galaxy.Comment: Accepted for publication in Astronomy & Astrophysics, comments are still welcom
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Crossref
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info:doi/10.1051%2F0004-6361%2...
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Archive Ouverte en Sciences de l'Information et de la Communication
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