Scatter broadening measurements of 124 pulsars at 327 MHz

Abstract

We present the measurements of scatter broadening time-scales (${\tau }_{sc}$) for 124 pulsars at 327 MHz, using the upgraded Ooty Radio Telescope (ORT). These pulsars lie in the dispersion measure range of 37 $-$ 503 pc cm${}^{-3}$ and declination ($\delta$) range of $-$57${}^{\circ }<\delta <60^{\circ }$. New ${\tau }_{sc}$ estimates for 58 pulsars are presented, increasing the sample of all such measurements by about 40% at 327 MHz. Using all available ${\tau }_{sc}$ measurements in the literature, we investigate the dependence of ${\tau }_{sc}$ on dispersion measure. Our measurements, together with previously reported values for ${\tau }_{sc}$, affirm that the ionized interstellar medium upto 3 kpc is consistent with Kolmogorov spectrum, while it deviates significantly beyond this distance.

19 pages, 4 figures, accepted for publication in ApJ

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