Abstract
We have measured the decorrelation frequency (f v ) and decorrelation time (t v ) for 15 pulsars. We show by combining our data with those of others thatfv∫ DM-1.79±0.14 andt v ∫ DM-0.80±0.15 up to a dispersion measure (DM) of about 60 cm3 pc. The combined data set does not form a complete sample, but the relations obtained from our measurements on 14 pulsars, which form almost a complete sample up to 41 cm3 pc, are consistent with the above relations, suggesting that these relations are not seriously affected by selection effects. The relations are broadly in agreement with those expected from a homogeneous interstellar medium and are in disagreement with earlier conclusions by others that these relations steepen even for low-DM pulsars. The agreement suggests that the local interstellar medium is homogeneous at least up to a distance of about 2 kpc.
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Balasubramanian, V., Krishnamohan, S. Interstellar scintillation measurements of pulsars at 326.5 MHz. Astrophys Astron 6, 35–47 (1985). https://doi.org/10.1007/BF02719527
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DOI: https://doi.org/10.1007/BF02719527