Theory and observations of a jet in the σ Orionis region: HH 444

Details Theory and observations of a jet in the σ Orionis region: HH 444 Theory and observations of a jet in the σ Orionis region: HH 444

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001rmxac..10...61l&link_type=abstract

The Seventh Texas-Mexico Conference on Astrophysics: Flows, Blows and Glows (Eds. William H. Lee and Silvia Torres-Peimbert) Rev

Astronomy and Astrophysics

Astrophysics

Hydrodynamics, Ism: Individual Objects: Hh 444, Ism: Jets And Outflows, Shock Waves, Techniques: Spectroscopic

Scientific paper

The discovery of a system of Herbig-Haro objects ejected by young, low mass stars in the &sigma Orionis region (Reipurth et al. 1998) has given rise to models of the photoionization of a neutral jet by an external source. We present long-slit spectra of high spectral resolution of HH 444 and numerical simulations for this Herbig-Haro object using ``yguazú'', a 3D gasdynamic +radiative transfer code (Raga et al. 1999). We find that a velocity profile in the jet beam is necessary to explain the observed accelaration in the position-velocity diagram of the HH jet. We also need also assume a non-zero opening angle at the base of the jet to explain the decreasing H α intensity at increasing distances from the source and a variable ejection velocity to reproduce the well separated knots observed along the jet.

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