V380 Ori: the cm-wavelength emission

This is a contour map of the cm-wavelength emission from the HH 1 & 2 region.

You may also see images at other wavelengths by clicking on the colorbar at a point above any of the dashed arrows (which point to other regions of the spectrum at which images are available). The solid arrow shows the spectral region you are seeing now. This is not intended to be a linear scale in wavelength, but only a rough guide to the wavelength of the observation.

VLA 1 and the HH 1 & 2 Outflow

The original H-H objects (Herbig 1951, Haro 1952) are found in this field. An optical-infrared study of this region (Strom et al. 1985) was able to identify the powering source of the outflow, of which HH 1 & 2 are the visible manifestations (see the red image), as the cm-wavelength VLA source discovered by Pravdo et al. (1985).

In the centimeter-wavelength image of this field emission is also seen from the Herbig-Haro objects themselves, as well as from another source which is also seen as a water vapor maser. An extragalactic background source is also found within the field as well.

Recent observations (Rodriguez et al. 1990) have resolved the jet from the central source. The jet appears extended along the outflow, in the direction of the line connecting HH 1 & 2. The spectra of the sources associated with HH 1 & 2 are consistent with optically thin free-free emission. The central source has a rising spectral index, which is smaller, however, than that expected for a spherical ionized stellar wind. They find that the morphology, flux and angular size dependence with frequency are all consistent with the source being a bipolar, confined jet. However this ionized outflow appears to be insufficient to drive HH 1 & 2. Therefore the majority of the outflow must be neutral.

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Haro, G. 1952, ApJ, 115, 572

Herbig, G. 1951, ApJ, 113, 697

Pravdo, S.H. et al. 1985, ApJ Letters, 293, L35

Rodriguez et al. 1990, Ap.J., 352, 645

Strom, K.M. et al. 1985, AJ, 90, 2281


© 2000

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