HH 111
Herbig–Haro object in Orion
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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]
| Emission nebula | |
|---|---|
| Herbig–Haro object | |
Hubble WFC3 image of HH 111 | |
| Observation data: J2000.0 epoch | |
| Right ascension | 05h 51m 44.2s[1] |
| Declination | +02° 48′ 34″[1] |
| Distance | 1500[2] ly |
| Constellation | Orion[2] |
| Designations | HH 111 |
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 km/s and consist of a blueshifted component, which is bright in optical wavelengths and a redshifted faint counterjet.[4] A second pair of bipolar jets, called HH 121, was discovered in the near-infrared at an angle of 61° compared to the HH 111 pair. This was taken as evidence for a system with multiple protostars.[5][6]
Gallery
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
