Search results for "Dynamics"
showing 10 items of 9782 documents
X-ray and optical emission in protostellar jets: model predictions and comparison with observations
2007
Modeling the X-ray emission from the nearest jets: HH 154 and DG Tau
2010
X-ray Emission in protostellar jets
2005
Prompted by the recent detection of X-ray emission from Herbig-Haro objects, we studied the interaction between a supersonic jet originating from a young stellar object and the ambient medium; our aim is to investigate the mechanisms causing the X-ray emission. Our model takes into account the radiative losses from optically in plasmas and Spitzer's thermal conduction including saturation effects. We explored the parameter space defined by the density contrast between the ambient medium and the jet and by the Mach number, to infer the configurations which can give rise to X-ray emission. From the models, we derived the X-ray emission as it would be observed with Chandra/ACIS-I and XMM-Newto…
X-ray emission in protostellar jets: comparison between model predictions and observations
2007
Herbig-Haro objects: model prediction and comparison with X-ray and optical observations
2007
X-ray emission from fast moving shocks in the protostellar jet HH 154: a binding diagnostic of the emission mechanism
2004
We propose to determine the proper motion of the X-ray source associated with HH 154, the only known protostellar jet in which the X-ray emission mechanism can be studied in detail. Our numerical simulations indicate that the X-rays are produced in a fast-moving (500 km/s) post-shock region, and our HST observations show high proper motion shocked material moving at similar speed. Detection (or lack of) of proper motion of the X-ray source will strongly confirm (or falsify) our model, and constitute the basis for a general theory of X-ray emission in protostellar jets. Understanding and modeling the emission mechanism is key to assess the lifetime of the X-ray emission and thus the influenc…