Explosive ejection of matter associated with star formation in the Orion nebula

Allen, David A.; Burton, M. G.

doi:10.1038/363054a0

Cited by 251 publications

(248 citation statements)

References 24 publications

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“…The fingers and wakes may be driven by high-density, compact ejecta ("bullets" or HVCCs) as originally suggested by Allen & Burton (1993). Similar bullets have been detected in other astrophysical contexts such as supernova remnants where hydrodynamic and cooling instabilities fragment an expanding stellar envelope (Fesen et al 2011;Milisavljevic & Fesen 2013).…”

Section: Constraints On the Ejection Mechanismmentioning

confidence: 90%

“…This dimension is used as an estimator for the size-scale of the material powering each shock which may be the working surface of a jet (Smith & Rosen 2007), a wind which has experienced instabilities (Stone et al 1995), or a dense bullet (Allen & Burton 1993). The tangent lines become increasingly parallel (greater than 90 • ) in the wake.…”

Section: Constraints On the Ejection Mechanismmentioning

confidence: 99%

“…The flow is traced by the millimeter and sub-millimeter emission lines of molecules such as CO, CS, SO, SO 2 , and HCN that exhibit broad (>100 km s −1 ) emission line wings (Kwan & Scoville 1976;Wiseman & Ho 1996;Furuya & Shinnaga 2009), high-velocity OH, H 2 O, and SiO maser emission (Genzel et al 1981;Greenhill et al 1998), and bright shock-excited "fingers" of H 2 and "fingertips" of 1.64 µm [Fe ] emission (Allen & Burton 1993;Colgan et al 2007;Nissen et al 2007; Lee & Burton 2000;Bally et al 2011). The OMC1 outflow has a southeast (red-shifted) to northwest (blueshifted) axis and contains at least 8 M of accelerated gas with a median velocity of about 20 km s −1 .…”

Section: Introductionmentioning

confidence: 99%

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The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow

Bally¹,

Ginsburg²,

Silvia

et al. 2015

A&A

132

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Aims. Adaptive optics (AO) images are used to test the hypothesis that the explosive BN/KL outflow from the Orion OMC1 cloud core was powered by the dynamical decay of a non-hierarchical system of massive stars. Results. Several sub-arcsecond H 2 features and many [Fe ] "fingertips" on the projected outskirts of the flow show proper motions of ∼300 km s −1 . High-velocity, sub-arcsecond H 2 knots ("bullets") are seen as far as 140 from their suspected ejection site. If these knots propagated through the dense Orion A cloud, their survival sets a lower bound on their densities of order 10 7 cm −3 , consistent with an origin within a few au of a massive star and accelerated by a final multi-body dynamic encounter that ejected the BN object and radio source I from OMC1 about 500 yr ago. Conclusions. Over 120 high-velocity bow-shocks propagating in nearly all directions from the OMC1 cloud core provide evidence for an explosive origin for the BN/KL outflow triggered by the dynamic decay of a non-hierarchical system of massive stars. Such events may be linked to the origin of runaway, massive stars.

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Section: Constraints On the Ejection Mechanismmentioning

confidence: 90%

Section: Constraints On the Ejection Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow

Bally¹,

Ginsburg²,

Silvia

et al. 2015

A&A

132

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“…Allen & Burton 1993;Schild et al 1997;Chen et al 1998;Stolovy et al 1998;Schultz et al 1999) and using theoretical shock models (Wilgenbus et al 2000) to reproduce the observed brightness of emission in the H 2 v = 1−0 S(1) line at 2.121 µm. The results in V2001 showed that clumps of gas emitting in the v = 1−0 S(1) line do not form a fractal size distribution but rather display a preferred scale size lying between 1.…”

Section: Introductionmentioning

confidence: 99%

H₂excitation imaging of the Orion Molecular Cloud

Kristensen

Gustafsson

Field

et al. 2003

A&A

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Abstract.Observations are reported of IR emission in H 2 , around 2 µm in the K-band, obtained with the ESO 3.6 m telescope using the ADONIS adaptive optics system. Data cover a region of the Orion Molecular Cloud north of the Trapezium stars and SW of the Becklin-Neugebauer object. Excellent seeing yielded diffraction limited images in the v = 2−1 S(1) line at 2.247 µm. Excitation temperature images were created by combining these data with similar data for H 2 emission in the v = 1−0 S(1) line reported earlier ). Shock models are used to estimate densities in emitting clumps of material. In local zones with high excitation temperatures, post-shock densities are found to be as high as several times 10 8 cm −3 , an order of magnitude denser than our previous estimates. We propose that the nature of these zones is dictated by the combined activity of shocks, which create dense structures, and the powerful radiation field of θ 1 C Ori which photoevaporates the boundaries of these structures.

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“…Although these fragments represent only a small fraction of the total mass of the shell, they can produce a very striking set of bow shocks in their wake. An example of this occurring around one or more pre-main sequence stars is given by the "bullets" observed around OMC-1 (Lane 1989, Allen & Burton 1993 in the Orion star forming region, as confirmed by McCaughrean & Mac Low (1997).…”

Section: Rayleigh-taylor Instabilitymentioning

confidence: 74%

Wolf-rayet and LBV nebulae as the result of variable and non-spherical stellar winds

Low

Variable and Non-Spherical Stellar Winds in Luminous Hot Stars

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Explosive ejection of matter associated with star formation in the Orion nebula

Cited by 251 publications

References 24 publications

The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow

The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow

H₂excitation imaging of the Orion Molecular Cloud

Wolf-rayet and LBV nebulae as the result of variable and non-spherical stellar winds

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Explosive ejection of matter associated with star formation in the Orion nebula

Cited by 251 publications

References 24 publications

The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow

The Orion fingers: Near-IR adaptive optics imaging of an explosive protostellar outflow

H2excitation imaging of the Orion Molecular Cloud

Wolf-rayet and LBV nebulae as the result of variable and non-spherical stellar winds

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Product

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H₂excitation imaging of the Orion Molecular Cloud