Optically thick Herbig-Haro jets in photoionized regions

Details Optically thick Herbig-Haro jets in photoionized regions Optically thick Herbig-Haro jets in photoionized regions

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376.1073m&link_type=abstract

Astronomy and Astrophysics, v.376, p.1073-1079 (2001)

Astronomy and Astrophysics

Astrophysics

7

Ism: Hh Objects, Hydrodynamics, Methods: Numerical

Scientific paper

Over the last few years, a number of Herbig-Haro (HH) jets have been discovered within the confines of H II regions. These jets apparently are ejected from low mass stars that are similar to the sources of other ``normal'' HH jets, but the flows show some special characteristics which are a result of the photoionization due to the ionizing photons emitted by the star that excites the H II region. In this paper, we present HH jet models including an external, photoionizing radiation field, and study the effects of increasing ionizing photon fluxes F* on the structure of the head of the jet. We find that the morphology, the emission line fluxes and the line ratios change drastically as a function of increasing F*. These results give general guidelines for deciding whether an HH jet actually does lie within an H II region, based on the morphology and spectroscopic characteristics of the object.

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