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Detection of Synchrotron Emission from a Unique Herbig Haro Object in Orion

Published online by Cambridge University Press:  19 July 2016

F. Yusef-Zadeh
Affiliation:
Dept. of Physics and Astronomy, Northwestern University Evanston, IL 60201
T. Cornwell
Affiliation:
NRAO, P.O. Box O, Socorro, NM 87801
B. Reipurth
Affiliation:
ESO, Karl-Schwarzschild-Strasse 2, D-8046 Garching bei München
M. Roth
Affiliation:
ESO, Karl-Schwarzschild-Strasse 2, D-8046 Garching bei München

Abstract

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We have obtained radio continuum observations of an HH object, known as the “streamer” in Orion using the VLA in a number of configurations at λ2, 6 and 20cm. This object is located several arc-minutes to the north of HH34 in L1641 cloud and exhibits a remarkably long and narrow structure with dimensions of 5′ × 10′ in optical photographs unlike the morphology of any other HH object. Based on radio continuum observations, we have detected a significant linearly polarized emission at λ6cm from the core of the streamer indicating highly uniform magnetic field geometry. This unusual result suggests that the source responsible for producing the nebulosity is a nonthermal-emitting radio source. Because of the presence of a number of newly born low-mass stars in L1641 and because of the detection of a highly reddened 2μm source coincident with the synchrotron source, it is likely that the source at the core of the streamer is a low-mass star responsible for the non-thermal emission and the HH nebulosity. Presence of synchrotron emission associated with a newly born star supports further view that the magnetic field plays a strong role in the early phase of star formation.

Type
6. Magnetic Fields in Molecular Clouds, Dark Globules and in the Pre-Stellar and Circumstellar Environment
Copyright
Copyright © Kluwer 1990