YSO Jets: Feedback from Mesoscopic to Macroscopic scales

1
YSO Jets Feedback from Mesoscopic to
Macroscopic scales

• Adam Frank
• University of Rochester
• Andrew Cunningham, Kris Yirak
• Eric Blackman, Alice Quillen,
• Sorin Mitran (UNC), John Bally (CU),
• Pat Hartigan (Rice)

2
The ToolAstroBEAR AMR Code
Cunningham, Frank, Varniere Mitran 2007

• Block AMR
• Choice of solvers/integrators
• Parallel load balance
• Multi-physics modules
• Ionization and H2Chemistry
• heat conduction
• self-gravity
• rad trans (diff limit)
• MHD Flux conservation via CT

3
Radiative Outflows in Heterogeneous
MediaCunningham, Frank, Varniere Mitran 2007
4
Feedback on Meso Maco Scales.

• Microscopic launch region (L lt 100 AU)
• Mesoscopic Individual outflow (L lt .1 pc)
• Macroscopic Cluster/pc-scale flow ( L 1 pc)

• Mesoscopic
• Outflows affect on envelope
• density
• velocity
• emission

5
Scattered Light CavitiesLaski, Frank, Cunningham
2007

• Explore envelope shaping via
• Jets
• Wide Angle Winds
• Envelope rotating collapse.
• Use scattered-light code for images
• Wood et al
• Shang et al. 2006

10000 au
6
Macroscopic ScalesOutflow Feedback Turbulence

• Can space-filling isotropic turbulence be driven
  by needles (jets), or balloons (outflows)?
• Explicate mechanisms.
• Connection with observational structures.
• Global Analytics Matzner, Tan, Krumhotz,
  others
• Global sims Maclow 2000, Nakamura Li 2005,
  2007
• Resolution critical for jet sims Rj 20
  zones.

• Observation total outflow energy budgets
  cloud/cluster turbulent energy (Walawender et al
  2006, Sandell Knee 2001).
• Observation Parsec outflows common (Bally,
  Devine Reipurth, Ray)
• Typical cloud size/stellar density gt whole
  cluster overrun by outflows.
• Tens/Hundreds proto-stars eject enough Ek
  replenish Eturb.

7
Project 1Outflow Collisions as a Route to
TurbulenceExplore effect of single collisions
on accelerating ambient material. Vary impact
parameter b Cunningham, Frank Blackman 2006
8
Results
b5rj
brj
b0
Collisions reduce effective entrainment Increase
Radiative Losses Bad for turbulence.
b0
brj
b5rj
9
Project 2Fossil Cavities as Intermediaries to
Protostellar TurbulenceObservations of NGC 1333
Quillen et al 2005Simulations of Fossil
CavitiesCunningham et al 2006
10
Project 2 NGC 1333 A Test Case(Quillen et al
2005)

• NGC 1333 Numerous active outflows
• (Knee Sandell 2000 Walsh et. al 2006)
• Explore High Rez 13CO Data - No correlation of
  outflows with velocity dispersion. (Ridge et al,
  COMPLETE)
• Butnumerous low V cavities seen in channel
  maps.
• No stellar source at center of cavities Fossil
  Cavities of extinct outflows.
• Scaling relation
• Ek(fossil outflows) Eturb

11
Cavity SimulationsCunningham, Frank, Blackman
Quillen 2006

• Explore time-decaying Jets/WAW outflow evolution
  (Bertout et al 96)
• Outflow power decays after 104 y.
• Simulation runs for 105 y
• Run to 0.5 pc scales
• Compare with scaling relations of Quillen et al.
• Compare with PV diagrams

12
Fossil Cavity Sims Jets and WAW
Collimated Jet
Wide Angle Wind (Matzner Class Sol)

• Strong deceleration
• Rarefactions backfill cavity

13
Fossil Cavity Sims Results
Quillen et al scaling relation for momentum
Simulation comparison deviation from scaling
relation small
WAW
jets
Time dependent jets/wind fossil cavities
turbulent support
14
Project 3Radiative Jets in Turbulent
MediaMechanism for a single jetCunningham et
al. 2007
15
Time-dependent Jets in Turbulent Environment
Long Period
2-D slices of 3-D simulation
Short Period
16
Time Dependent Jets in a Turbulent Environment
Intermediate pulse
Long pulse

• Without jet, turbulence decays as expected.
• With jet, turbulence re-energized on all
  scales.
• With jet long driving scales energized which
• not previously present.

17
Future Focus on Individual ObjectsL1551Frank,
Bally, Blackman, Hartigan 200x
18
Conclusions

• Colliding Jets
• Interactions of active outflows not important.
• NGC 1333/Fossil Cavities
• Fossil cavities store momentum.
• Fossil cavities transient jets/outflows
• Momentum budgets match
• Outflows in Turbulent Media
• Outflows re-energize turbulence.

Region between Meso-scale and Macro-scale
likely to matter.