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dc.contributor.authorAlexander, J
dc.contributor.authorand Gulyaev, S
dc.date.accessioned2011-12-16T03:14:26Z
dc.date.available2011-12-16T03:14:26Z
dc.date.copyright2011
dc.date.issued2011-12-16
dc.identifier.citationThe Astrophysical Journal, 745:194 (6pp), 2012 February 1
dc.identifier.urihttp://hdl.handle.net/10292/3136
dc.description.abstractWe critically analyze the Bell et al. findings on "anomalous" widths of high-order Hydrogen radio recombination lines in the Orion Nebula at 6 GHz. We review their method of modified frequency switching and show that the way this method is used for large \Delta n is not optimal and can lead to misinterpretation of measured spectral line parameters. Using a model of the Orion Nebula, conventional broadening theory and Monte Carlo simulation, we determine a transition-zone n = 224...241 (\Delta n = 11...14), where measurement errors grow quickly with n and become comparable with the measurement values themselves. When system noise and spectrum channelization are accounted for, our simulation predicts "processed" line narrowing in the transition-zone similar to that reported by Bell et al. We find good agreement between our simulation results and their findings, both in line temperatures and widths. We conclude, therefore, that Bell et al.'s findings do not indicate a need to revise Stark broadening theory.
dc.publisherIOPScience
dc.relation.urihttp://dx.doi.org/10.1088/0004-637X/745/2/194
dc.rightsThe AAS is eager for the information published in its journals to reach the widest possible audience and it encourages the reuse of figures, tables, or other materials in review articles, textbooks, and other appropriate means of scholarly communication. To ensure the long-term access of the research community to its archives, the AAS holds the copyright on all copyrightable materials published in its journals, but the Society grants control of the right to reproduce the material to the original authors as long as they are alive.
dc.subjectAstrometry
dc.subjectKuiper belt
dc.subjectGeneral
dc.subjectPlanets and satellites
dc.subjectDynamical evolution and stability
dc.subjectFormation
dc.titleOn the apparent narrowing of radio recombination lines at high principal quantum numbers
dc.typeJournal Article
dc.rights.accessrightsOpenAccess
dc.identifier.doi10.1088/0004-637X/743/1/1


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