Instant Radio Spectra of Giant Pulses from the Crab Pulsar Over Decimeter to Decameter Wave Band

Details Instant Radio Spectra of Giant Pulses from the Crab Pulsar Over Decimeter to Decameter Wave Band Instant Radio Spectra of Giant Pulses from the Crab Pulsar Over Decimeter to Decameter Wave Band

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...2e..19p&link_type=abstract

On the Present and Future of Pulsar Astronomy, 26th meeting of the IAU, Joint Discussion 2, 16-17 August, 2006, Prague, Czech Re

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results of simultaneous multi-frequency observations of giant radio pulses (GPs) from the Crab pulsar PSR B0531+21 at frequencies of 23, 111 and 600 MHz. For the first time GPs were detected at such low frequency as 23 MHz. Among 45 GPs detected in the overall observations time with 600 MHz, 12 GPs were identified as simultaneous ones at 600 and 23 MHz. At 111 MHz among 128 GPs detected in the overall observations time with 600 MHz, 21 GPs were identified as simultaneous ones at 600 and 111 MHz. Spectral indexes for the power-law frequency dependence of GPs energy were enclosed between -3.1 and -1.6. Mean spectral index equals to -2.7 ± 0.1 and is the same for both frequency combinations 600-111 MHz and 600-23 MHz. A big scatter in values of the individual spectral indexes and a large number of unidentified giant pulses, indicate that a real form of spectra of individual giant pulses does not follow a simple power law. The shape of giant pulses at all three frequencies is governed by the scattering of radio waves on the inhomogeneities of the interstellar plasma. The pulse scatter broadening and their frequency dependence was measured as τ[SC]=20(ν/100)^-3.5^±^0.1 ms, where frequency ν is in MHz. The main results of these observations are present on the figure bellow.

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