The ALMA View of the OMC1 Explosion in Orion

John Bally, Adam Ginsburg, Hector Arce, Joshua A Eisner, Allison Youngblood, Luis Zapata, Hans Zinnecker

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Most massive stars form in dense clusters where gravitational interactions with other stars may be common. The two nearest forming massive stars, the BN object and Source I, located behind the Orion Nebula, were ejected with velocities of ∼29 and ∼13 km s-1 about 500 years ago by such interactions. This event generated an explosion in the gas. New ALMA observations show in unprecedented detail, a roughly spherically symmetric distribution of over a hundred 12CO J = 2-1 streamers with velocities extending from V LSR = -150 to +145 km s-1. The streamer radial velocities increase (or decrease) linearly with projected distance from the explosion center, forming a "Hubble Flow" confined to within 50″ of the explosion center. They point toward the high proper-motion, shock-excited H2 and [Fe ii] "fingertips" and lower-velocity CO in the H2 wakes comprising Orion's "fingers." In some directions, the H2 "fingers" extend more than a factor of two farther from the ejection center than the CO streamers. Such deviations from spherical symmetry may be caused by ejecta running into dense gas or the dynamics of the N-body interaction that ejected the stars and produced the explosion. This ∼1048 erg event may have been powered by the release of gravitational potential energy associated with the formation of a compact binary or a protostellar merger. Orion may be the prototype for a new class of stellar explosiozn responsible for luminous infrared transients in nearby galaxies.

Original languageEnglish (US)
Article number60
JournalAstrophysical Journal
Volume837
Issue number1
DOIs
StatePublished - Mar 1 2017

Fingerprint

explosions
explosion
massive stars
Orion nebula
stars
gas dynamics
interactions
proper motion
ejecta
potential energy
gas
ejection
wakes
radial velocity
erg
merger
gravitational fields
low speed
symmetry
shock

Keywords

  • Herbig-Haro objects
  • ISM: individual objects (Orion OMC1)
  • ISM: jets and outflows
  • stars: formation
  • stars: massive

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bally, J., Ginsburg, A., Arce, H., Eisner, J. A., Youngblood, A., Zapata, L., & Zinnecker, H. (2017). The ALMA View of the OMC1 Explosion in Orion. Astrophysical Journal, 837(1), [60]. https://doi.org/10.3847/1538-4357/aa5c8b

The ALMA View of the OMC1 Explosion in Orion. / Bally, John; Ginsburg, Adam; Arce, Hector; Eisner, Joshua A; Youngblood, Allison; Zapata, Luis; Zinnecker, Hans.

In: Astrophysical Journal, Vol. 837, No. 1, 60, 01.03.2017.

Research output: Contribution to journalArticle

Bally, J, Ginsburg, A, Arce, H, Eisner, JA, Youngblood, A, Zapata, L & Zinnecker, H 2017, 'The ALMA View of the OMC1 Explosion in Orion', Astrophysical Journal, vol. 837, no. 1, 60. https://doi.org/10.3847/1538-4357/aa5c8b
Bally J, Ginsburg A, Arce H, Eisner JA, Youngblood A, Zapata L et al. The ALMA View of the OMC1 Explosion in Orion. Astrophysical Journal. 2017 Mar 1;837(1). 60. https://doi.org/10.3847/1538-4357/aa5c8b
Bally, John ; Ginsburg, Adam ; Arce, Hector ; Eisner, Joshua A ; Youngblood, Allison ; Zapata, Luis ; Zinnecker, Hans. / The ALMA View of the OMC1 Explosion in Orion. In: Astrophysical Journal. 2017 ; Vol. 837, No. 1.
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