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Title:
Limits on Turbulent H I Fluctuations toward PSR B0329+54 on Scales between 0.0025 and 12.5 AU
Authors:
Minter, Anthony H.; Balser, Dana S.; Kartaltepe, Jeyhan S.
Affiliation:
AA(National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944.), AB(National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944.), AC(Department of Physics and Astronomy, Colgate University, Hamilton, NY 13346.; Current address: University of Hawaii, Honolulu, HI 96822.)
Publication:
The Astrophysical Journal, Volume 631, Issue 1, pp. 376-380. (ApJ Homepage)
Publication Date:
09/2005
Origin:
UCP
ApJ Keywords:
ISM: Clouds, ISM: Structure, Stars: Pulsars: Individual: Alphanumeric: B0329+54, Radio Lines: ISM, Turbulence
DOI:
10.1086/432367
Bibliographic Code:
2005ApJ...631..376M

Abstract

We have measured the H I absorption toward pulsar B0329+54 using the Green Bank Telescope during 18 epochs between 2002 June 30 and 2003 October 10. Three observing epochs consisted of a continuous period of 20 hr each, while 15 epochs were 1-2 hr each. We calculate the structure function of H I absorption variations toward the pulsar on timescales of 10 minutes to 16 months, which using the proper motion of 95 km s-1 and the parallactic distance of 1.03 kpc measured toward B0329+54 (Brisken et al.), corresponds to angular scales of 0.37 μas to 23.8 mas and samples structures between 0.0025 and 12.5 AU, assuming H I gas halfway to the pulsar and ignoring scintillation effects. We find no evidence for any turbulent H I absorption fluctuations toward B0329+54, with the following upper limits on Δτ for various absorption features: 0.026 at -31, -21, -18, and +4 km s-1 0.12 at -11 km s-1 and 0.055 at -1 km s-1.
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