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Anisotropic scattering of OH/IR stars toward the Galactic centerWe have made angular broadening measurements in the satellite line of the OH molecule at 1612 MHz of eight OH/IR stars located near the Galactic center with the Very Large Array. Early observations with the Very Long Baseline Array had revealed a region of pronounced scattering approximately centered on Sgr A*. These new observations show that the compact line emission from these stars is scattered by an amount that is 2-3 times larger than had been previously seen. Additionally, we measured noncircular scattering disks for these objects, evidence that the electron density variations are distributed anisotropically. The present data suggest that the enhanced turbulence is located near the Galactic center. However, we cannot completely rule out that the scattering is caused by an unrelated region along the line of sight.
Document ID
19950031811
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Frail, Dale A.
(NRAO/AOC, Socorro, NM United States)
Diamond, Philip J.
(NRAO/AOC, Socorro, NM United States)
Cordes, James M.
(Cornell Univ. Ithaca, NY, United States)
Langevelde, Huib Jan Van
(JIVE, Radiosterrenwacht Dwingeloo, Dwingeloo Netherlands)
Date Acquired
August 16, 2013
Publication Date
May 20, 1994
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 427
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A63410
Distribution Limits
Public
Copyright
Other

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