Discovery of X-rays from the protostellar outflow object HH2

Steven H. Pravdo (), Eric D. Feigelson, Gordon Garmire, Yoshitomo Maeda, Yohko Tsuboi and John Bally
Additional contact information
Steven H. Pravdo: Jet Propulsion Laboratory, California Institute of Technology, Mail Stop 306-438
Eric D. Feigelson: 525 Davey Laboratory, The Pennsylvania State University
Gordon Garmire: 525 Davey Laboratory, The Pennsylvania State University
Yoshitomo Maeda: 525 Davey Laboratory, The Pennsylvania State University
Yohko Tsuboi: 525 Davey Laboratory, The Pennsylvania State University
John Bally: Astrophysics and Planetary Science, University of Colorado

Nature, 2001, vol. 413, issue 6857, 708-711

Abstract: Abstract Herbig–Haro (HH) objects have been known1,2 for 50 years to be luminous condensations of gas in star-forming regions, but their underlying physical nature is still being elucidated. Previously suggested models encompass newborn stars3, stellar winds clashing with nebular material4, dense pockets of interstellar gas excited by shocks from outflows5, and interstellar ‘bullets’ (ref. 6). Recent progress has been made with the jet-induced shock model7, in which material streams out of young stellar objects and collides with the surrounding interstellar medium. A clear prediction of this model is that the most energetic Herbig–Haro objects will emit X-rays, although they have not hitherto been detected8. Here we report the discovery of X-ray emission from one of the brightest and closest Herbig–Haro objects, HH2, at a level consistent with the model predictions. We conclude that this Herbig–Haro object contains shock-heated material located at or near its leading edge with a temperature of about 106 K.

Date: 2001
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DOI: 10.1038/35099508

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