Properties of Knots in Cooling Stellar Jets
| Autor: | F. Rubini, S. Lorusso, Francesca Bacciotti, F. Leewin, C. Giovanardi |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Jet (fluid) Astrophysics::High Energy Astrophysical Phenomena Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Kinematics Cosmology Space and Planetary Science Radiative transfer Emissivity Oblique shock Axial symmetry Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astrophysics and Space Science. 293:181-187 |
| ISSN: | 0004-640X |
| DOI: | 10.1023/b:astr.0000044666.49427.cf |
| Popis: | Modelling the formation of the maximal emission regions in Herbig-Haro flows, the socalled ‘knots,’ remains a main challenge in the investigation of the YSO’s outflows. Recent HST images of optical regions reveal their wide morphological variety. Knotty structures and arc-like regions coexist, suggesting that several mechanisms could be responsible for the global scenario. Arc-like emissions are probably due to other mini-working surfaces or non-axially symmetric interaction of the kinking jet matter with the external medium, while knots seen in [SII] are mostly axially symmetric objects and may have a different origin. In this paper we show that a pattern of regularly spaced, knotty emission regions forms in stationary jets, with emissivity and kinematic features consistent with observations. To this purpose, numerical simulations of non-equilibrium, radiative, hydrodynamical jets in axial symmetric geometry have been performed. |
| Databáze: | OpenAIRE |
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