We present the first Spitzer-IRS spectral maps of the Herbig-Haro flow GGD 37 detected in lines of [Ne III], [O IV], [Ar III], and [Ne V]. The detection of extended [O IV] (55 eV) and some extended emission in [Ne V] (97 eV) indicates a shock temperature in excess of 100,000 K, in agreement with X-ray observations, and a shock speed in excess of 200 km s-1. The presence of an extended pho- toionization or collisional ionization region indicates that GGD 37 is a highly unusual protostellar outflow.
@article{arxiv.1012.0029,
title = {GGD 37: An Extreme Protostellar Outflow},
author = {J. D. Green and D. M. Watson and E. Bergin and S. Maret and G. Melnick and P. Sonnentrucker and V. Tolls and B. A. Sargent and W. J. Forrest and K. H. Kim and S. N. Raines},
journal= {arXiv preprint arXiv:1012.0029},
year = {2015}
}