| DOI | Trouver le DOI : https://doi.org/10.1007/s10509-011-0662-5 |
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| Auteur | Rechercher : Bell, M. B.1; Rechercher : Avery, L. W.1; Rechercher : MacLeod, J. M.1; Rechercher : Vallée, J. P.1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut Herzberg d'astrophysique du CNRC
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| Format | Texte, Article |
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| ISSN | 0004-640X |
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| Sujet | HII regions; ISM: abundances; radio lines: ISM |
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| Résumé | Sensitive spectral observations made in two frequency bands near 6.0 and 17.6 GHz are described for Orion and W51. Using frequency switching we were able to achieve a dynamic range in excess of 10,000 without fitting sinusoidal or polynomial baselines. This enabled us to detect lines as weak as TA ∼ 1 mK in these strong continuum sources. Hydrogen recombination lines with n as high as 25 have been detected in Orion. In the Orion data, where the lines are stronger, we have also detected a systematic shift in the line center frequencies proportional to linewidth that cannot be explained by normal optical depth effects. |
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| Date de publication | 2011-06 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 19739593 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | d7a0976d-b03f-43ed-b62a-4ff83c6ee69a |
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| Enregistrement créé | 2012-03-29 |
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| Enregistrement modifié | 2020-04-21 |
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