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Title:
Large-Scale Flows from Orion South1,
Authors:
Henney, W. J.; O'Dell, C. R.; Zapata, Luis A.; García-Díaz, Ma. T.; Rodríguez, Luis F.; Robberto, Massimo
Affiliation:
AA(Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58090 Morelia, Michoacán, Mexico ), AB(Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA), AC(Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58090 Morelia, Michoacán, Mexico ), AD(Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58090 Morelia, Michoacán, Mexico; Instituto de Astronomía, Universidad Nacional Autónoma de México, 22800 Ensenada, Baja California, Mexico. ), AE(Centro de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, 58090 Morelia, Michoacán, Mexico ), AF(Space Telescope Science Institute, Baltimore, MD 21218, USA)
Publication:
The Astronomical Journal, Volume 133, Issue 5, pp. 2192-2205. (AJ Homepage)
Publication Date:
05/2007
Origin:
UCP
Astronomy Keywords:
H II regions, ISM: Herbig-Haro objects, ISM: individual: Orion Nebula: HH 528: Orion-S: OMC-1S: Orion South: M42, ISM: jets and outflows, stars: pre-main sequence
DOI:
10.1086/513074
Bibliographic Code:
2007AJ....133.2192H

Abstract

Multiple optical outflows are known to exist in the vicinity of the active star formation region called Orion South (Orion-S). We have mapped the velocity of low-ionization features in the brightest part of the Orion Nebula, including Orion-S, and imaged the entire nebula with the Hubble Space Telescope. These new data, combined with recent high-resolution radio maps of outflows from the Orion-S region, allow us to trace the origin of the optical outflows. It is confirmed that HH 625 arises from the blueshifted lobe of the CO outflow from 136-359 in Orion-S, while it is likely that HH 507 arises from the blueshifted lobe of the SiO outflow from the nearby source 135-356. It is likely that redshifted lobes are deflected within the photon-dominated region behind the optical nebula. This leads to a possible identification of a new large shock to the southwest of Orion-S as being driven by the redshifted CO outflow arising from 137-408. The distant object HH 400 is seen to have two even further components, and these all are probably linked to either HH 203, HH 204, or HH 528. Distant shocks on the west side of the nebula may be related to HH 269. The sources of multiple bright, blueshifted Herbig-Haro objects (HH 202, HH 203, HH 204, HH 269, and HH 528) remain unidentified, in spite of earlier claimed identifications. Some of this lack of identification may arise from the fact that deflection in radial velocity can also produce a change in direction in the plane of the sky. The best way to resolve this open question is through improved tangential velocities of low-ionization features arising where the outflows first break out into the ionized nebula.

Based on observations obtained at the Kitt Peak National Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the National Science Foundation.

Based on observations with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.

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