Spatio-spectral maximum entropy method. I. Formulation and test

Su Chan Bong, Jeongwoo Lee, Dale Gary, Hong Sik Yun

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The spatio-spectral maximum entropy method (SSMEM) has been developed by Komm and coworkers in 1997 for use with solar multifrequency interferometric observation. In this paper we further improve the formulation of the SSMEM to establish it as a tool for astronomical imaging spectroscopy. We maintain their original idea that spectral smoothness at neighboring frequencies can be used as an additional a priori assumption in astrophysical problems and that this can be implemented by adding a spectral entropy term to the usual maximum entropy method (MEM) formulation. We, however, address major technical difficulties in introducing the spectral entropy into the imaging problem that are not encountered in the conventional MEM. These include calculation of the spectral entropy in a generally frequency-dependent map grid, simultaneous adjustment of the temperature variables and Lagrangian multipliers in the spatial and spectral domain, and matching the solutions to the observational constraints at a large number of frequencies. We test the performance of the SSMEM in comparison with the conventional MEM.

Original languageEnglish (US)
Pages (from-to)1159-1165
Number of pages7
JournalAstrophysical Journal
Volume636
Issue number2 I
DOIs
StatePublished - Jan 10 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: radio radiation
  • Techniques: image processing
  • Techniques: interferometric
  • Techniques: miscellaneous
  • Techniques: spectroscopic

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