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Title:
High Spatial Velocity Features in the Orion Nebula,
Authors:
O'Dell, C. R.; Henney, W. J.
Affiliation:
AA(Department of Physics and Astronomy, Vanderbilt University, Box 1807-B, Nashville, TN 37235, USA ), AB(Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, Apartado Postal 3-72, 58090 Morelia, Michaoacán, Mexico)
Publication:
The Astronomical Journal, Volume 136, Issue 4, pp. 1566-1586 (2008). (AJ Homepage)
Publication Date:
10/2008
Origin:
IOP
AJ Keywords:
H II regions, ISM: Herbig-Haro objects, ISM: individual: NGC 1976, stars: formation, stars: winds, outflows
DOI:
10.1088/0004-6256/136/4/1566
Bibliographic Code:
2008AJ....136.1566O

Abstract

We have used widely spaced in time Hubble Space Telescope images to determine tangential velocities of features associated with outflows from young stars. These observations were supplemented by ground-based telescope spectroscopy, and from the resultant radial velocities, space velocities were determined for many outflows. Numerous new moving features were found and grouped into known and newly assigned Herbig-Haro objects. It was found that stellar outflow is highly discontinuous, as frequently is the case, with long-term gaps of a few hundred years, and that these outflow periods are marked by staccato bursts over periods of about ten years. Although this has been observed in other regions, the Orion Nebula Cluster presents the richest display of this property. Most of the large-scale Herbig-Haro objects in the brightest part of the Orion Nebula appear to originate from a small region northeast of the strong Orion-S radio and infrared sources. With the possible exception of HH 203, we are not able to identify specific stellar sources, but do identify candidate sources for several other bright Herbig-Haro objects. We find that there are optical features in the BN-KL region that can be related to the known large-scale outflow that originates there. We find additional evidence for this outflow originating 500-1000 years ago.

Based on observations at the San Pedro Martir Observatory operated by the Universidad Nacional Autónoma de México.

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