Submillimeter emission from the hot molecular jet HH 211
Por:
Palau A., Ho P.T.P., Zhang Q., Estalella R., Hirano N., Shang H., Lee C.-F., Bourke T.L., Beuther H., Kuan Y.-J.
Publicada:
1 ene 2006
Resumen:
We observed the HH 211 jet in the submillimeter continuum and the CO (3-2) and SiO (8-7) transitions with the Submillimeter Array. The continuum source detected at the center of the outflow shows an elongated morphology, perpendicular to the direction of the outflow axis. The high-velocity emission of both molecules shows a knotty and highly collimated structure. The SiO (8-7) emission at the base of the outflow, close to the driving source, spans a wide range of velocities, from -20 up to 40 km s-1. This suggests that a wide-angle wind may be the driving mechanism of the HH 211 outflow. For distances ?5? (?1500 AU) from the driving source, emission from both transitions follows a Hubble-law behavior, with SiO (8-7) reaching higher velocities than CO (3-2) and being located upstream of the CO (3-2) knots. This indicates that the SiO (8-7) emission is likely tracing entrained gas very close to the primary jet, while the CO (3-2) is tracing less dense entrained gas. From the SiO (5-4) data of Hirano et al., we find that the SiO (8-7)/SiO (5-4) brightness temperature ratio along the jet decreases for knots far from the driving source. This is consistent with the density decreasing along the jet, from (3-10) × 106 cm-3 at 500 AU to (0.8-4) × 106 cm-3 at 5000 AU from the driving source. © 2006. The American Astronomical Society. All rights reserved.
Filiaciones:
Palau A.:
Departament d'Astronomia I Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
Ho P.T.P.:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Zhang Q.:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Estalella R.:
Departament d'Astronomia I Meteorologia, Universitat de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Spain
Hirano N.:
Academia Sinica, Institute of Astronomy and Astrophysics, P.O. Box 23141, Taipei, 106, Taiwan
Shang H.:
Academia Sinica, Institute of Astronomy and Astrophysics, P.O. Box 23141, Taipei, 106, Taiwan
Lee C.-F.:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Bourke T.L.:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Beuther H.:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, United States
Max-Planck-Institut for Astronomy, Koenigstuhl 17, 69117 Heidelberg, Germany
Kuan Y.-J.:
Academia Sinica, Institute of Astronomy and Astrophysics, P.O. Box 23141, Taipei, 106, Taiwan
Departament of Earth Science, National Taiwan Normal University, 88 Sec. 4, Ting-Chou Road, Taipei, 116, Taiwan
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