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A new inclination instability in a disk of stars around a massive black hole
Ann-Marie Madigan, UC Berkeley
~50% of stars in nuclear star clusters form in-situ (Antonini, 2015)
Credit: Richard Alexander
A new inclination instability in a disk of stars around a massive - - PowerPoint PPT Presentation
A new inclination instability in a disk of stars around a massive - - PowerPoint PPT Presentation
A new inclination instability in a disk of stars around a massive black hole Ann-Marie Madigan, UC Berkeley ~50% of stars in nuclear star clusters form in-situ (Antonini, 2015) Credit: Richard Alexander Disk stability Galactic center:
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Disk stability
- Galactic center:
~80% of young stars not on disk plane (Yelda et al. 2014) Mapelli, 2015
- Extra-galactic nuclear star clusters:
Rotation in young populations < 1 Gyr (Seth et al. 2006)
There is an instability in disks with eccentric
- rbits which rapidly disperses inclinations!
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e = 0.0
Disk of stars; parameters taken from Alexander et al. (2007)
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N-body simulations
Madigan et al. in prep
e = 0.9
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➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤
ˆ b ˆ a ~ J ~ F ~ F ~ ⌧ ˆ b ˆ a ~ F ~ r ~ J ~ ⌧
➤ ➤ ➤ ➤ ➤
➤
➤ ➤ ➤ ➤ ➤ ➤
➤
➤
ˆ b ˆ a ~ J ~ F ~ F ~ ⌧ ˆ b ˆ a ~ F ~ r ~ J ~ ⌧
credit: Mike McCourt ib ia
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Summary
An inclination instability exists in Kepler disks of eccentric orbits.
- 1. Constraints on gas accretion event which
formed young disk in Galactic center.
- 2. Inner Oort Cloud objects are clustered in
ω (Trujillo & Sheppard 2014)
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