A. C. Raga,1 and B. Reipurth2
1 Instituto de Ciencias Nucleares, UNAM, Apartado Postal 70-543, 04510 México, D. F., México. (raga@nuclecu.unam.mx)
2 Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA. (reipurth@ifa.hawaii.edu).
Received 2003 June 3
Accepted 2003 October 20.
ABSTRACT
We present numerical simulations of a Herbig-Haro flow that bursts out of a dense cloud core into a surrounding H II region. Such blow-outs from cloud cores have recently been imaged in various star-forming regions, and we here explore the properties of such out flows by varying selected input parameters to the models. We present time-series of temperature, density, ionization fraction, and Hα emission. We find that the Hα emission of the outflows is mostly controlled by the impinging ionizing photon field rather than by the intrinsic properties of the outflows.
Key Words: ISM: Herbing-Haro objects — ISM: Jets and out-flows — ISM: Kinematics and dynamics.
RESUMEN
Presentamos simulaciones numéricas de un flujo Herbig-Haro que sale de una nube densa hacia una región H II. Este tipo de "salidas" de nubes densas han sido observadas recientemente en varias regiones de formación estelar, y aquí exploramos las propiedades de estos flujos variando algunos de los parámetros libres del modelo. Presentamos series temporales de la temperatura, densidad, fracción de ionización y de la emisión en Hα . Encontramos que la emisión en Hα de los flujos está mayormente controlada por el flujo incidente de fotones ionizantes, en lugar de por las propiedades intrínsecas del flujo.
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]]> ACKNOWLEDGEMENTS
The work of ACR was supported by CONACyT grant 36572-E and DGAPA (UNAM) grant IN 112602. BR acknowledges support from NASA grant NAGW-3192 (LTSA).
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