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A Protostellar Jet Emanating from a Hypercompact HII Region

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Title: A Protostellar Jet Emanating from a Hypercompact HII Region
Authors: Guzmán, Andrés E., Garay, Guido, Rodríguez, Luis F., Contreras, Yanett, Dougados, Catherine, Cabrit, Sylvie
Publication Year: 2016
Collection: Astrophysics
Subject Terms: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies
More Details: We present radio continuum observations of the high-mass young stellar object (HMYSO) G345.4938+01.4677 made using the Australia Telescope Compact Array (ATCA) at 5, 9, 17, and 19 GHz. These observations provide definite evidence that the outer and inner pairs of radio lobes consist of shock ionized material being excited by an underlying collimated and fast protostellar jet emanating from a hypercompact HII region. By comparing with images taken 6 yr earlier at 5 and 9 GHz using the same telescope, we assess the proper motions of the radio sources. The outer West and East lobes exhibit proper motions of $64\pm12$ and $48\pm13$ milliarcsec yr$^{-1}$, indicating velocities projected in the plane of the sky and receding from G345.4938+01.4677 of $520$ and $390$ km s$^{-1}$, respectively. The internal radio lobes also display proper motion signals consistently receding from the HMYSO, with magnitudes of $17\pm11$ and $35\pm10$ milliarcsec yr$^{-1}$ for the inner West and East lobes, respectively. The morphology of the outer West lobe is that of a detached bow shock. At 17 and 19 GHz, the outer East lobe displays an arcuate morphology also suggesting a bow shock. These results show that disk accretion and jet acceleration --- possibly occurring in a very similar way compared with low-mass protostars --- is taking place in G345.4938+01.4677 despite the presence of ionizing radiation and the associated hypercompact HII region.
Comment: Accepted in the Astrophysical Journal. 36 pages, 9 figures
Document Type: Working Paper
DOI: 10.3847/0004-637X/826/2/208
Access URL: http://arxiv.org/abs/1605.07687
Accession Number: edsarx.1605.07687
Database: arXiv
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  Data: A Protostellar Jet Emanating from a Hypercompact HII Region
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  Data: <searchLink fieldCode="AR" term="%22Guzmán%2C+Andrés+E%2E%22">Guzmán, Andrés E.</searchLink><br /><searchLink fieldCode="AR" term="%22Garay%2C+Guido%22">Garay, Guido</searchLink><br /><searchLink fieldCode="AR" term="%22Rodríguez%2C+Luis+F%2E%22">Rodríguez, Luis F.</searchLink><br /><searchLink fieldCode="AR" term="%22Contreras%2C+Yanett%22">Contreras, Yanett</searchLink><br /><searchLink fieldCode="AR" term="%22Dougados%2C+Catherine%22">Dougados, Catherine</searchLink><br /><searchLink fieldCode="AR" term="%22Cabrit%2C+Sylvie%22">Cabrit, Sylvie</searchLink>
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  Label: Publication Year
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  Data: 2016
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  Data: Astrophysics
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  Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Solar+and+Stellar+Astrophysics%22">Astrophysics - Solar and Stellar Astrophysics</searchLink><br /><searchLink fieldCode="DE" term="%22Astrophysics+-+Astrophysics+of+Galaxies%22">Astrophysics - Astrophysics of Galaxies</searchLink>
– Name: Abstract
  Label: Description
  Group: Ab
  Data: We present radio continuum observations of the high-mass young stellar object (HMYSO) G345.4938+01.4677 made using the Australia Telescope Compact Array (ATCA) at 5, 9, 17, and 19 GHz. These observations provide definite evidence that the outer and inner pairs of radio lobes consist of shock ionized material being excited by an underlying collimated and fast protostellar jet emanating from a hypercompact HII region. By comparing with images taken 6 yr earlier at 5 and 9 GHz using the same telescope, we assess the proper motions of the radio sources. The outer West and East lobes exhibit proper motions of $64\pm12$ and $48\pm13$ milliarcsec yr$^{-1}$, indicating velocities projected in the plane of the sky and receding from G345.4938+01.4677 of $520$ and $390$ km s$^{-1}$, respectively. The internal radio lobes also display proper motion signals consistently receding from the HMYSO, with magnitudes of $17\pm11$ and $35\pm10$ milliarcsec yr$^{-1}$ for the inner West and East lobes, respectively. The morphology of the outer West lobe is that of a detached bow shock. At 17 and 19 GHz, the outer East lobe displays an arcuate morphology also suggesting a bow shock. These results show that disk accretion and jet acceleration --- possibly occurring in a very similar way compared with low-mass protostars --- is taking place in G345.4938+01.4677 despite the presence of ionizing radiation and the associated hypercompact HII region.<br />Comment: Accepted in the Astrophysical Journal. 36 pages, 9 figures
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      – SubjectFull: Astrophysics - Astrophysics of Galaxies
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