AMI radio continuum observations of young stellar objects with known outflows
We present 16 GHz (1.9 cm) deep radio continuum observations made with the Arcminute Microkelvin Imager (AMI) of a sample of low-mass young stars driving jets. We combine these new data with archival information from an extensive literature search to examine spectral energy distributions (SEDs) for...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing Ltd.
2012
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| Subjects: | |
| Online Access: | http://hdl.handle.net/20.500.11937/5078 |
| _version_ | 1848744695918755840 |
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| author | Ainsworth, R. Scaife, A. Ray, T. Buckle, J. Davies, M. Frantzen, T. Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Perrott, Y. Pooley, G. Richer, J. Rodriguez-Gonzalvez, C. Saunders, R. Schammel, M. Scott, P. Shimwell, T. Titterington, D. Waldram, E. |
| author_facet | Ainsworth, R. Scaife, A. Ray, T. Buckle, J. Davies, M. Frantzen, T. Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Perrott, Y. Pooley, G. Richer, J. Rodriguez-Gonzalvez, C. Saunders, R. Schammel, M. Scott, P. Shimwell, T. Titterington, D. Waldram, E. |
| author_sort | Ainsworth, R. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We present 16 GHz (1.9 cm) deep radio continuum observations made with the Arcminute Microkelvin Imager (AMI) of a sample of low-mass young stars driving jets. We combine these new data with archival information from an extensive literature search to examine spectral energy distributions (SEDs) for each source and calculate both the radio and sub-mm spectral indices in two different scenarios: (1) fixing the dust temperature (Td) according to evolutionary class; and (2) allowing Td to vary. We use the results of this analysis to place constraints on the physical mechanisms responsible for the radio emission. From AMI data alone, as well as from model fitting to the full SED in both scenarios, we find that 80 per cent of the objects in this sample have spectral indices consistent with freefree emission. We find an average spectral index in both Td scenarios, consistent with freefree emission. We examine correlations of the radio luminosity with bolometric luminosity, envelope mass and outflow force, and find that these data are consistent with the strong correlation with envelope mass seen in lower luminosity samples. We examine the errors associated with determining the radio luminosity and find that the dominant source of error is the uncertainty on the opacity index, beta. We examine the SEDs for variability in these young objects, and find evidence for possible radio flare events in the histories of L1551 IRS 5 and Serpens SMM 1. |
| first_indexed | 2025-11-14T06:05:34Z |
| format | Journal Article |
| id | curtin-20.500.11937-5078 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:05:34Z |
| publishDate | 2012 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-50782017-09-13T14:44:02Z AMI radio continuum observations of young stellar objects with known outflows Ainsworth, R. Scaife, A. Ray, T. Buckle, J. Davies, M. Frantzen, T. Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Perrott, Y. Pooley, G. Richer, J. Rodriguez-Gonzalvez, C. Saunders, R. Schammel, M. Scott, P. Shimwell, T. Titterington, D. Waldram, E. clouds stars radiation mechanisms ISM general formation We present 16 GHz (1.9 cm) deep radio continuum observations made with the Arcminute Microkelvin Imager (AMI) of a sample of low-mass young stars driving jets. We combine these new data with archival information from an extensive literature search to examine spectral energy distributions (SEDs) for each source and calculate both the radio and sub-mm spectral indices in two different scenarios: (1) fixing the dust temperature (Td) according to evolutionary class; and (2) allowing Td to vary. We use the results of this analysis to place constraints on the physical mechanisms responsible for the radio emission. From AMI data alone, as well as from model fitting to the full SED in both scenarios, we find that 80 per cent of the objects in this sample have spectral indices consistent with freefree emission. We find an average spectral index in both Td scenarios, consistent with freefree emission. We examine correlations of the radio luminosity with bolometric luminosity, envelope mass and outflow force, and find that these data are consistent with the strong correlation with envelope mass seen in lower luminosity samples. We examine the errors associated with determining the radio luminosity and find that the dominant source of error is the uncertainty on the opacity index, beta. We examine the SEDs for variability in these young objects, and find evidence for possible radio flare events in the histories of L1551 IRS 5 and Serpens SMM 1. 2012 Journal Article http://hdl.handle.net/20.500.11937/5078 10.1111/j.1365-2966.2012.20935.x Wiley-Blackwell Publishing Ltd. fulltext |
| spellingShingle | clouds stars radiation mechanisms ISM general formation Ainsworth, R. Scaife, A. Ray, T. Buckle, J. Davies, M. Frantzen, T. Grainge, K. Hobson, M. Hurley-Walker, Natasha Lasenby, A. Olamaie, M. Perrott, Y. Pooley, G. Richer, J. Rodriguez-Gonzalvez, C. Saunders, R. Schammel, M. Scott, P. Shimwell, T. Titterington, D. Waldram, E. AMI radio continuum observations of young stellar objects with known outflows |
| title | AMI radio continuum observations of young stellar objects with known outflows |
| title_full | AMI radio continuum observations of young stellar objects with known outflows |
| title_fullStr | AMI radio continuum observations of young stellar objects with known outflows |
| title_full_unstemmed | AMI radio continuum observations of young stellar objects with known outflows |
| title_short | AMI radio continuum observations of young stellar objects with known outflows |
| title_sort | ami radio continuum observations of young stellar objects with known outflows |
| topic | clouds stars radiation mechanisms ISM general formation |
| url | http://hdl.handle.net/20.500.11937/5078 |