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Title: ALMA OBSERVATIONS OF THE HH 46/47 MOLECULAR OUTFLOW

The morphology, kinematics, and entrainment mechanism of the HH 46/47 molecular outflow were studied using new ALMA Cycle 0 observations. Results show that the blue and red lobes are strikingly different. We argue that these differences are partly due to contrasting ambient densities that result in different wind components having a distinct effect on the entrained gas in each lobe. A 29 point mosaic, covering the two lobes at an angular resolution of about 3'', detected outflow emission at much higher velocities than previous observations, resulting in significantly higher estimates of the outflow momentum and kinetic energy than previous studies of this source, using the CO(1-0) line. The morphology and the kinematics of the gas in the blue lobe are consistent with models of outflow entrainment by a wide-angle wind, and a simple model describes the observed structures in the position-velocity diagram and the velocity-integrated intensity maps. The red lobe exhibits a more complex structure, and there is evidence that this lobe is entrained by a wide-angle wind and a collimated episodic wind. Three major clumps along the outflow axis show velocity distribution consistent with prompt entrainment by different bow shocks formed by periodic mass ejection episodes which take placemore » every few hundred years. Position-velocity cuts perpendicular to the outflow cavity show gradients where the velocity increases toward the outflow axis, inconsistent with outflow rotation. Additionally, we find evidence for the existence of a small outflow driven by a binary companion.« less
Authors:
 [1] ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)
  2. Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago (Chile)
  3. Joint ALMA Observatory, Av. Alonso de Cordova 3107, Vitacura, Santiago (Chile)
  4. Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States)
  5. Instituto de Ciencias Nucleares, UNAM, Ap. 70-543, 04510 D.F. (Mexico)
Publication Date:
OSTI Identifier:
22133959
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 774; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CARBON MONOXIDE; CLOUDS; ENTRAINMENT; HERBIG-HARO OBJECTS; KINETIC ENERGY; MOLECULES; MORPHOLOGY; ROTATION; SHOCK WAVES; SPECTRA; STELLAR WINDS; VELOCITY