Journal
ASTRONOMY & ASTROPHYSICS
Volume 412, Issue 3, Pages 745-749Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20031477
Keywords
ISM : Herbig-Haro objects; ISM : jets and outflows; ISM : kinematics and dynamics; shock waves
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We propose that some low excitation HH objects might correspond to the head of a pulsed jet moving into a dense environment. We develop an analytic model showing that the head of such a jet will move slowly, producing a low excitation bow shock. At the times at which the successive pulses catch up with the jet head, high excitation emission will be produced, lasting for a time of the order of the cooling timescale of the material heated in the pulse/ jet head interaction. In this way, the jet head has flashes of high excitation emission superimposed on a quiescent, low excitation emission.
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