Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E
We have used multiple mid-infrared observations at 4.5 μ m obtained with the infrared array camera, of the compact $(\sim 1.4^{\prime} )$ young stellar bipolar outflow Cep E to measure the proper motion of its brightest condensations. The images span a period of $\sim 6$ yr and have been reprocessed...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2014-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/16/10/105008 |
| _version_ | 1827874300019867648 |
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| author | A Noriega-Crespo A C Raga A Moro-Martín N Flagey S J Carey |
| author_facet | A Noriega-Crespo A C Raga A Moro-Martín N Flagey S J Carey |
| author_sort | A Noriega-Crespo |
| collection | DOAJ |
| description | We have used multiple mid-infrared observations at 4.5 μ m obtained with the infrared array camera, of the compact $(\sim 1.4^{\prime} )$ young stellar bipolar outflow Cep E to measure the proper motion of its brightest condensations. The images span a period of $\sim 6$ yr and have been reprocessed to achieve a higher angular resolution $(\sim 0.8^{\prime\prime} )$ than their normal beam $(\sim 2^{\prime\prime} )$ . We found that for a distance of 730 pc, the tangential velocities of the north and south outflow lobes are $62\pm 29$ and $94\pm 26\;{\rm km}\;{{{\rm s}}^{-1}}$ respectively, and moving away from the central source roughly along the major axis of the flow. A simple 3D hydrodynamical simulation of the H _2 gas in a precessing outflow supports this idea. Observations and models confirm that the molecular hydrogen gas, traced by the pure rotational transitions, moves at highly supersonic velocities without being dissociated. This suggests either a very efficient mechanism to reform H _2 molecules along these shocks or the presence of some other mechanism (e.g. strong magnetic field) that shields the H _2 gas. |
| first_indexed | 2024-03-12T16:50:19Z |
| format | Article |
| id | doaj.art-26becd3f17fc42adaed1320a669eab19 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:50:19Z |
| publishDate | 2014-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-26becd3f17fc42adaed1320a669eab192023-08-08T11:21:18ZengIOP PublishingNew Journal of Physics1367-26302014-01-01161010500810.1088/1367-2630/16/10/105008Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep EA Noriega-Crespo0A C Raga1A Moro-Martín2N Flagey3S J Carey4Infrared Processing and Analysis Center, California Institute of Technology , CA 91125, USA; Space Telescope Science Institute , 3700 San Martin Dr Baltimore, MD 21218, USAInstituto de Ciencias Nucleares, Universidad Nacional Autónoma de México , Ap. 70–543, 04510 D.F., MexicoSpace Telescope Science Institute , 3700 San Martin Dr Baltimore, MD 21218, USAJet Propulsion Laboratory, California Institute of Technology , CA 91099, USA; Institute for Astronomy , 640 North Aóhoku Place, Hilo, HI 96720, USASpitzer Science Center, California Institute of Technology , CA 91125, USAWe have used multiple mid-infrared observations at 4.5 μ m obtained with the infrared array camera, of the compact $(\sim 1.4^{\prime} )$ young stellar bipolar outflow Cep E to measure the proper motion of its brightest condensations. The images span a period of $\sim 6$ yr and have been reprocessed to achieve a higher angular resolution $(\sim 0.8^{\prime\prime} )$ than their normal beam $(\sim 2^{\prime\prime} )$ . We found that for a distance of 730 pc, the tangential velocities of the north and south outflow lobes are $62\pm 29$ and $94\pm 26\;{\rm km}\;{{{\rm s}}^{-1}}$ respectively, and moving away from the central source roughly along the major axis of the flow. A simple 3D hydrodynamical simulation of the H _2 gas in a precessing outflow supports this idea. Observations and models confirm that the molecular hydrogen gas, traced by the pure rotational transitions, moves at highly supersonic velocities without being dissociated. This suggests either a very efficient mechanism to reform H _2 molecules along these shocks or the presence of some other mechanism (e.g. strong magnetic field) that shields the H _2 gas.https://doi.org/10.1088/1367-2630/16/10/105008ISM: jets and outflowsinfrared: ISMHerbig–Haro objectscircumstellar matterstar formation |
| spellingShingle | A Noriega-Crespo A C Raga A Moro-Martín N Flagey S J Carey Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E New Journal of Physics ISM: jets and outflows infrared: ISM Herbig–Haro objects circumstellar matter star formation |
| title | Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E |
| title_full | Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E |
| title_fullStr | Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E |
| title_full_unstemmed | Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E |
| title_short | Proper motions of young stellar outflows in the mid-infrared with Spitzer II HH 377/Cep E |
| title_sort | proper motions of young stellar outflows in the mid infrared with spitzer ii hh 377 cep e |
| topic | ISM: jets and outflows infrared: ISM Herbig–Haro objects circumstellar matter star formation |
| url | https://doi.org/10.1088/1367-2630/16/10/105008 |
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