Changes between Version 18 and Version 19 of TriggeredStarFormation
- Timestamp:
- 01/07/14 18:57:06 (11 years ago)
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TriggeredStarFormation
v18 v19 8 8 [[BR]][[BR]][[BR]][[BR]] 9 9 10 '''== Hydro Triggering with Initial Rotation =='''[[BR]] 10 == Hydro Triggering with Initial Rotation == 11 [[BR]] 11 12 We setup an initial marginally stable Bonnor-Ebert sphere as the triggering target. The cloud has 1 $M_{\odot}$ and radius of $0.058 pc$, with central density $6.3\times10^{-19} g/cc$ and edge density of $3.6\times 10^{-20} g/cc$. The cloud has a uniform interior temperature at $10K$. The ambient medium is setup to satisfy the pressure balancing at the cloud edge, with density $3.6\times 10^{-22} g/cc$ and temperature of $1000 K$. We have performed simulations to check the stability of the cloud, and found that the initial cloud breathes at a time scale of about $10$ cloud crushing time scales (here after $t_{cc}$), which is longer than the time span of our simulation ($4t_{cc}$). $t_{cc}$ is defined as the time for the transmitted shock to pass the cloud, which is estimated to be $t_{cc} \approx 276 kyrs$. The free-fall time of the cloud is $t_{ff} \approx 84 kyrs$. 12 13 [[BR]][[BR]] … … 54 55 [[BR]][[BR]][[BR]][[BR]] 55 56 56 '''== Choice of Algorithm =='''[[BR]] 57 == Choice of Algorithm == 58 [[BR]] 57 59 We implement Krumholz's (Krumholz et al 2006) sink particle algorithm apart from Federrath et al 2010. The differences in the two algorithms are summarized in the following papers:[[BR]] 58 60 http://arxiv.org/pdf/astro-ph/0312612v1.pdf … … 99 101 [[BR]][[BR]][[BR]][[BR]] 100 102 101 '''== MHD Triggering =='''[[BR]] 103 == MHD Triggering == 104 [[BR]] 102 105 When added magnetic field to the cloud, the triggering behavior can be very different. Here, we suppose the initial rotation to be zero first, and look at the case where there is a global uniform magnetic field along the vertical axis. We assume Mach = 3, and the magnetic field has beta of 4. The density slice looks like:[[BR]][[BR]] 103 106 1 cloud crushing time: [[BR]]
