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What does Ammonia trace in Egg Nebula. Pao-Jan Chiu With Jeremy Lim 2003 8.27. Outline. Optical Structure of the Egg Nebula 12 CO Molecular Outflows Structure of NH 3 (1,1) Observations with VLA Results and Discussion Summary. CRL2688 - Egg Nebula. Proto-Planetary nebula (PPN)

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what does ammonia trace in egg nebula
What does Ammonia trace in Egg Nebula

Pao-Jan Chiu

With Jeremy Lim

2003 8.27

outline
Outline
  • Optical Structure of the Egg Nebula
  • 12CO Molecular Outflows
  • Structure of NH3(1,1)
  • Observations with VLA
  • Results and Discussion
  • Summary
crl2688 egg nebula

CRL2688 - Egg Nebula

Proto-Planetary nebula (PPN)

Distance ~ 1 kpc

Optical features

bipolar lobes

twin searchlight beams

quasi-spherical AGB wind

shocked molecular hydrogen

“dust lane”

multiple outflows in egg nebula
Multiple Outflows in Egg nebula
  • 12CO trace multiple outflows.
  • Shocked molecular hydrogen traces lobes of polar outflow, tips of “equatorial” outflows.

Arrow – axis of 12CO outflows contour – 12CO

color – optical image + shocked H2

nh 3 1 1 in egg nebula equatorial disk or central toru
NH3(1,1) in Egg nebulaEquatorial disk or central toru?
  • NH3(1,1) aligned with the dust lane
  • Kinematics suggest expansion: Expanding Disk
  • Spur to north?

Bipolar lobes

-63.5~-23.9km/s

NH3(1,1)

-75~ 5km/s

Nguyen-Q-Rieu, A. Winnberg, V. Bujarrabal ,1986

VLA D array, beamsize 4”.3 × 3”.4

Redial velocites from -63.5 to -23.9 km/s

results and discussion

NH3(1,1)

Results and Discussion

Comparison of NH3(3,3) andNH3(1,1)

  • At higher angular resolution, structure of NH3(3,3) does not resemble disk

NH3(3,3)

Beamsize 4”.3 × 3”.4

Beamsize 3”.19 × 2”.51

compare with optical lobes and shocked h 2
Compare with optical lobes and shocked H2
  • NH3(3,3) traces higher density (~105-106) and higher temperature (~120K) than 12CO (2-1)
  • The four NH3(3,3) peaks are at/close to tips of 12CO outflows.
  • NH3(3,3) traces shocked molecular gas behind the shock front (traced by shocked molecular hydrogen)

color – optical image + shocked H2

contour – NH3(3,3) contour – 12CO

slide9

Shock region

Shock region

Shock region

12CO

outflows

12CO

cooling region

cooling region

12CO

12CO

12CO

Shocked

H2

Shocked

H2

Shocked

H2

NH3(3,3)

NH3(3,3)

12CO

12CO

12CO

compare with optical lobes and shocked h 21
Compare with optical lobes and shocked H2
  • NH3(3,3) traces higher density (~105-106) and higher temperature (~120K) than 12CO (2-1)
  • The four NH3(3,3) peaks are at/close to tips of 12CO outflows.
  • NH3(3,3) traces shocked molecular gas behind the shock front (traced by shocked molecular hydrogen)

color – optical image + shocked H2

contour – NH3(3,3) contour – 12CO

velocity distribution in nh 3
Velocity distribution in NH3
  • North and east NH3(3,3) peaks are blueshifted
  • South and west NH3(3,3) peaks are redshifted
  • Kinematics of NH3(3,3) similar to 12CO outflow

Contour - 12CO

Color arrow - 12CO outflows

NH3(3,3)

summary
Summary
  • Observed NH3(3,3) in Egg Nebula with VLA NH3(3,3) trace the higher density and temperature molecule gas
  • NH3(3,3) not consistent with expanding disk
  • NH3(3,3) located at/close to tips of 12CO outflows and behind the shocked molecular hydrogen gas
  • Kinematics of NH3(3,3) similar to 12CO outflows
  • NH3(3,3) traces shocked molecular gas behind the shock front (traced by shocked molecular hydrogen)
  • Does the “equatorial” outflows lie in the same plane; i.e., disk that is aligned with the dust lane
orientation of the multiple equatorial outflows
Orientation of the Multiple “Equatorial” Outflows

Two models:

  • Model 1. Oriented in different directions, with no common plane
  • Model 2. “Equatorial” Outflows lie in the plane of a “disk” aligned with the dust lane
orientation of the multiple equatorial outflows1
Orientation of the Multiple “Equatorial” Outflows

Two models:

  • Model 1. Oriented in different directions, with no common plane
  • Model 2. “Equatorial” Outflows lie in the plane of a “disk” aligned with the dust lane

Model 2 requires the “disk” to be (rapidly) rotating