AUT LibraryAUT
View Item 
  •   Open Research
  • AUT Faculties
  • Faculty of Design and Creative Technologies (Te Ara Auaha)
  • School of Engineering, Computer and Mathematical Sciences - Te Kura Mātai Pūhanga, Rorohiko, Pāngarau
  • View Item
  •   Open Research
  • AUT Faculties
  • Faculty of Design and Creative Technologies (Te Ara Auaha)
  • School of Engineering, Computer and Mathematical Sciences - Te Kura Mātai Pūhanga, Rorohiko, Pāngarau
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

On the apparent narrowing of radio recombination lines at high principal quantum numbers

Alexander, J; and Gulyaev, S
Thumbnail
View/Open
ApJ413795p6_SG1.pdf (274.9Kb)
Permanent link
http://hdl.handle.net/10292/3136
Metadata
Show full metadata
Abstract
We 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.
Keywords
Astrometry; Kuiper belt; General; Planets and satellites; Dynamical evolution and stability; Formation
Date
2011
Source
The Astrophysical Journal, 745:194 (6pp), 2012 February 1
Item Type
Journal Article
Publisher
IOPScience
DOI
10.1088/0004-637X/743/1/1
Publisher's Version
http://dx.doi.org/10.1088/0004-637X/745/2/194
Rights Statement
The 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.

Contact Us
  • Admin

Hosted by Tuwhera, an initiative of the Auckland University of Technology Library

 

 

Browse

Open ResearchTitlesAuthorsDateSchool of Engineering, Computer and Mathematical Sciences - Te Kura Mātai Pūhanga, Rorohiko, PāngarauTitlesAuthorsDate

Alternative metrics

 

Statistics

For this itemFor all Open Research

Share

 
Follow @AUT_SC

Contact Us
  • Admin

Hosted by Tuwhera, an initiative of the Auckland University of Technology Library