HH 111

HH 111 is a Herbig-Haro object in the L1617 dark cloud of the Orion B molecular cloud^[2] in the constellation of Orion. It is a prototype of a highly collimated optical jet sources. It shows several bow shocks and has a length of about 2.6 light-years (0.8 parsec).^[3]

HH 111 is about 1300 light years (400 parsec) distant from earth and the central source is IRAS 05491+0247, also called VLA 1.^[2] This source is the driving source of the jets and it is a class I protostar with a luminosity of about 25 L_☉. This protostar is embedded in a 30 M_☉ cloud core.^[4] The dynamical age of the complex is only 800 years.^[4] Near the central source an ammonia feature called NH₃-S was found, which is a starless core with a turbulent interior induced by HH 111.^[2]

The jets move with a speed of 300 - 600

• 
  The bright blueshifted jet of HH 111 seen by the ground-based telescope NTT
• 
  HH 111 seen by the Spitzer Space Telescope in infrared, showing also HH 121
• 
  Animation of HH 111 (Hubble image), showing the movement of the jet and bow shock

References

External links

Wikimedia Commons has media related to HH 111.

• Animations of HH object jets from HST observations
• Geometry of the multiple star system (from 2000)