HH 111

Short description: Herbig-Haro object in Orion

HH 111Emission 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
See also: Lists of nebulae

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 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

## References

1. ↑ 1.0 1.1 "HH 111". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HH+111.
2. ↑ 2.0 2.1 2.2 2.3 2.4 Sewiło, Marta; Wiseman, Jennifer; Indebetouw, Remy; Charnley, Steven B.; Pineda, Jaime E.; Lindberg, Johan E.; Qin, Sheng-Li (November 2017). "Very Large Array Ammonia Observations of the HH 111/HH 121 Protostellar System: A Detection of a New Source with a Peculiar Chemistry" (in en). Astrophysical Journal 849 (1): 68. doi:10.3847/1538-4357/aa8b18. ISSN 0004-637X. Bibcode: 2017ApJ...849...68S.
3. ↑ Reipurth, Bo (July 1989). "The HH111 jet and multiple outflow episodes from young stars" (in en). Nature 340 (6228): 42–45. doi:10.1038/340042a0. ISSN 0028-0836. Bibcode: 1989Natur.340...42R.
4. ↑ 4.0 4.1 4.2 Reipurth, Bo; Raga, A. C.; Heathcote, Steve (June 1992). "Structure and Kinematics of the HH 111 Jet" (in en). Astrophysical Journal 392: 145. doi:10.1086/171413. ISSN 0004-637X. Bibcode: 1992ApJ...392..145R.
5. ↑ Reipurth, Bo; Yu, Ka Chun; Rodríguez, Luis F.; Heathcote, Steve; Bally, John (December 1999). "Multiplicity of the HH 111 jet source: it Hubble Space Telescope NICMOS images and VLA maps" (in en). Astronomy and Astrophysics 352: L83–L86. ISSN 0004-6361. Bibcode: 1999A&A...352L..83R.
6. ↑ "Hubble Finds Young Stars in Cosmic Dance" (in en). http://hubblesite.org/contents/news-releases/2000/news-2000-05.

## External links

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

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