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HIGH VELOCITY JETS IN WATER-FOUNTAIN PRE-PLANETARY NEBULAE. Mark Claussen, NRAO July 30, 2003 APN III, Mt. Rainier, WA. Talk Outline. Water Fountain Pre-Planetary Nebulae W43 A (Imai et al.) IRAS 16342-3814 (Claussen et al.) More Water Fountains ? Summary.

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High velocity jets in water fountain pre planetary nebulae

HIGH VELOCITY JETS IN WATER-FOUNTAIN PRE-PLANETARY NEBULAE

Mark Claussen, NRAO

July 30, 2003

APN III, Mt. Rainier, WA


Talk Outline

  • Water Fountain Pre-Planetary Nebulae

  • W43 A (Imai et al.)

  • IRAS 16342-3814 (Claussen et al.)

  • More Water Fountains ?

  • Summary

Collaborators: Raghvendra Sahai and Mark Morris

July 30, 2003 APN III


Water fountains sites of on going jet formation
Water fountains: sites of on-going jet formation

W43A

High velocity H2O masers

(Likkel et al. 1992)

  • V(H2O) >= 100 km/s

  • Clear double peaks

  • Symmetric with respect to the systemic velocity

IRAS

19134+2131

IRAS

16342-3814


Water fountains sites of on going jet formation1
Water fountains: sites of on-going jet formation

W43A

High velocity H2O masers (Likkel et al. 1992)

  • Newly-formed jets or extreme super winds ?

  • How old ?

  • How to produce ?

  • Young stellar objects ?

IRAS

19134+2131

IRAS

16342-3814


H 2 o maser kinematics in 2002

W43 A

H2O maser kinematics in 2002

Imai & Diamond (2003)


The W43A jet is precessing !

Period ~ 55 years Amplitude ~ 5 degrees Inclination ~ 39 degrees

A consistent model at each epoch Direct estimate of the distance: ~2.6 kpc, origin location, and jet ignition time (~30 yr ago)



Water masers mapped with the vla morris et al 2003 68 km s 155 km s
Water Masers Mapped with the VLA --- Morris et al. 2003 -68 km/s 155 km/s

IRAS 16342 –3814 Sahai et al. 1999



IRAS 16342-3814, VLBA February 2003

Length of this line is ~2975 mas, p.a. is 66 degrees (E of N)

Line drawn

between strongest

red and blue

shifted features.

We measure the

angular length of

this line to better

than one mas.

2000 AU



Red shifted masers vlba february 2002
Red-shifted masers, VLBA February 2002

Line connecting

strongest red and

blue shifted maser

features.

200 AU



Blue-shifted masers, VLBA February 2002

10 AU

Line connecting strongest

red and blue shifted

maser features.


IRAS16342-3814 Blue-Shifted Water Masers

February 2002

March 2002

April 2002

May 2002

10 AU


IRAS 16342-3814 VLBA Observations

  • First four epochs each separated by ~1 month in 2002

  • Date Separation Position Angle

    • 03 February 2972.0 mas 66.0 deg

    • 03 March 2973.6 66.1

    • 04 April 2975.0 66.1

    • 05 May 2979.6 66.1

July 30, 2003 APN III


Results of IRAS 16342-3814 VLBA Observations

  • For first four epochs, separation expands at an

  • an average rate of 287 km/s. (143 km/s in each

  • direction if divided equally, assumes a distance of

  • 2 kpc; Sahai et al. 1999) 3-D velocities +/- 185 km/s.

  • The small scale structure is reminiscent of bow

  • shocks seen in water maser proper motion studies

  • of YSO’s.

  • Over 3000 AU length, the masers get spread out

  • a maximum of 150 AU, collimation of ~ 3 deg.

July 30, 2003 APN III


Results of iras 16342 3814 vlba observations
Results of IRAS 16342-3814 VLBA Observations

  • Dynamical time scale is 150 years

  • IRAS16342 jet shows no evidence of precession

  • (curves and wiggles in the maser distribution in

  • a single epoch) as does W43 A.

July 30, 2003 APN III


Water Fountain Pre-Planetary Nebulae

  • Three examples from Likkel et al. 2 out of 3 show

  • similar sizes and very short dynamical scales; third

  • is presently being observed by Imai, Morris & Sahai.

  • The observations of collimated jets in these transition

  • sources suggest that PN morphology is shaped during

  • pre-PN stage.

  • Short dynamical times imply a very brief phase early

  • on the post-AGB evolution, and so water fountain PPN

  • are an important class of sources for understanding

  • the onset of axisymmetry.

  • Though water fountains are inherently rare, we would

  • like to find more of them; instituted survey of

  • candidates with the GBT.

July 30, 2003 APN III



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