The nature and frequency of outflows from stars in the central orion nebula cluster

C. R. O'Dell, G. J. Ferland, W. J. Henney, M. Peimbert, Ma T. García-Díaz, Robert H. Rubin

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


Recent Hubble Space Telescope images have allowed the determination with unprecedented accuracy of motions and changes of shocks within the inner Orion Nebula. These originate from collimated outflows from very young stars, some within the ionized portion of the nebula and others within the host molecular cloud. We have doubled the number of Herbig-Haro objects known within the inner Orion Nebula. We find that the best-known Herbig-Haro shocks originate from relatively few stars, with the optically visible X-ray source COUP 666 driving many of them. While some isolated shocks are driven by single collimated outflows, many groups of shocks are the result of a single stellar source having jets oriented in multiple directions at similar times. This explains the feature that shocks aligned in opposite directions in the plane of the sky are usually blueshifted because the redshifted outflows pass into the optically thick photon-dominated region behind the nebula. There are two regions from which optical outflows originate for which there are no candidate sources in the SIMBAD database.

Original languageEnglish
Article number108
JournalAstronomical Journal
Issue number4
StatePublished - Oct 1 2015

Bibliographical note

Publisher Copyright:
© 2015. The American Astronomical Society. All rights reserved..


  • H II regions
  • ISM: individual objects (Orion Nebula, NGC 1976, M42, Orion-South)
  • protoplanetary disks

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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