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The Tiny-Scale Atomic Structure: Gas Cloudlets or Scintillation Phenomenon ?

  • S. Stanimirović
  • J. M. Weisberg
  • A. Hedden
  • K. Devine
  • T. Green
  • S. B. Anderson

Abstract

We present preliminary results from the recent multi-epoch HI absorption measurements toward several pulsars using the Arecibo telescope. We do not find significant variations in optical depth profiles over periods of 4 months and 9 years. The upper limits on the optical depth variations in directions of B0823+26 and B1133+16 are similar on scales of 10–20, 350 and 500 AU. The large number of non detections of the tiny scale atomic structure suggests that the AU-sized structure is not ubiquitous in the interstellar medium.

Keywords

ISM structure pulsars 

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Copyright information

© Springer Science+Business Media Dordrecht 2004

Authors and Affiliations

  • S. Stanimirović
    • 1
  • J. M. Weisberg
    • 2
  • A. Hedden
    • 2
  • K. Devine
    • 2
  • T. Green
    • 2
  • S. B. Anderson
    • 3
  1. 1.Radio Astronomy LabUC BerkeleyBerkeleyUSA
  2. 2.Department of Physics and AstronomyCarleton CollegeNorthfieldUSA
  3. 3.Department of Astronomy, MS 18-34California Institute of TechnologyPasadenaUSA

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