Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..407..345j&link_type=abstract
The Low-Frequency Radio Universe ASP Conference Series, Vol. 407, proceedings of the conference held 8-12 December 2008, at Nati
Astronomy and Astrophysics
Astrophysics
Scientific paper
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.
Joshi Bhal Chandra
Kramer Mallie Mae
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