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Paper: Simultaneous Multi-frequency GMRT Observations of Millisecond Pulsars
Volume: 407, The Low-Frequency Radio Universe
Page: 345
Authors: Joshi, B.C.; Kramer, M.
Abstract: Few observations of Millisecond pulsars (MSPs), particularly those discovered in recent high frequency searches such as Parkes multibeam pulsar survey, are available at low frequencies. In this paper, we report the first results from a pilot simultaneous multi-frequency study of a sample of bright MSPs with GMRT. Coherently dedispersed 238 MHz average profiles for PSR J1300+1240, PSR J1643-1224, PSR J1939+2134 and PSR J1959+2048 have been presented for the first time. These observations generally confirm and extend to lower frequencies the trend of frequency evolution of average profiles for MSPs, noticed at higher frequencies previously (Kramer et al. 1999). In particular, a weak component, at the trailing edge of inter-pulse(IP), appears to be visible in the average profile for PSR J1939+2134 at 238 MHz and the data suggest a turnover in the IP spectrum for this pulsar. The spectra for three of these pulsars are also presented.
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