Search results for " ISM: Herbig-Haro objects"

showing 3 items of 3 documents

X-rays from protostellar jets: emission from continuous flows

2006

Recently X-ray emission from protostellar jets has been detected with both XMM-Newton and Chandra satellites, but the physical mechanism which can give rise to this emission is still unclear. We performed an extensive exploration of a wide space of the main parameters influencing the jet/ambient interaction. Aims include: 1) to constrain the jet/ambient interaction regimes leading to the X-ray emission observed in Herbig-Haro objects in terms of the emission by a shock forming at the interaction front between a continuous supersonic jet and the surrounding medium; 2) to derive detailed predictions to be compared with optical and X-ray observations of protostellar jets; 3) to get insight int…

PhysicsJet (fluid)Proper motionShock (fluid dynamics)Astrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsAstrophysicsSpace (mathematics)Thermal conductionSettore FIS/05 - Astronomia E AstrofisicaSpace and Planetary ScienceRadiative transferHerbig-Haro objects ISM: jets and outflows X-rays: ISM [shock waves ISM]Astrophysics::Solar and Stellar AstrophysicsSupersonic speedCylindrical coordinate systemshock waves ISM: Herbig-Haro objects ISM: jets and outflows X-rays: ISMAstrophysics::Galaxy AstrophysicsAstronomy & Astrophysics
researchProduct

The nearest X-ray emitting protostellar jet (HH 154) observed with Hubble

2008

Context. The jet coming from the YSO binary L1551 IRS5 is the closest astrophysical jet known. It is therefore a unique laboratory for studies of outflow mechanisms and of the shocks occurring when expanding material hits the ambient medium as well as of how the related processes influence the star- (and planet-) forming process. Aims. The optical data are related to other data covering the spectrum from the optical band to X-rays with goal of understanding the energetics of low-mass star jets, in general, and of this jet in particular. We study the time evolution of the jet, by measuring the proper motions of knots as they progress outwards from the originating source. Methods. The nebulos…

Shock wavePhysicsJet (fluid)Proper motionShock (fluid dynamics)Astrophysics::High Energy Astrophysical PhenomenaYoung stellar objectAstronomyAstronomy and AstrophysicsContext (language use)AstrophysicsAstrophysical jetSpace and Planetary ScienceHerbig–Haro objectshock waves ISM: Herbig-Haro objects ISM: jets and outflows X-rays: ISMAstrophysics::Galaxy AstrophysicsAstronomy & Astrophysics
researchProduct

Fast changes in the morphology of the X-ray emitting shocks in HH 154

2006

Our recent second epoch Chandra observations have shown a fast morphological evolution of the X-ray source associated with the protostellar jet HH 154 (Fig.\ 1). We propose to study the evolution of the optical structures in the jet, specially the ones associated with the X-ray emission with a monitoring program of imaging narrow and broad band optical observations. We will determine the proper motions (and braking) of the optical knows associated with shock features and the evolution of their line luminosity and therefore their cooling time. These data, together with our past and future X-ray observations, constitute a fundamental input and constraint to our parallel program of ongoing hyd…

shock waves ISM: Herbig-Haro objects ISM: jets and outflows
researchProduct