Observation of Giant Pulses from PSR B0531+21
Abstract
Individual giant radio pulses (GRPs) from the Crab pulsar last only a few μseconds. But during that time the pulsar becomes one the brightest objects in the radio sky, reaching flux densities of up to 1000 Jy, even at high radiofrequencies. We present high resolution dynamic spectra, profiles, and polarization properties of GRPs at a centre frequency of 8.35 GHz from our recent observations with the MPIfR 100m Radiotelescope in Effelsberg. Individual pulses show distinct spectral maxima within our observational bandwidth of 500 MHz. GRPs appear to be brighter at higher frequencies around 8.6 GHz than at lower frequencies of 8.1 GHz. Sometimes one observes two or three peaks following each other within a few 100 μseconds. In these cases there is evidence for spectral evolution. The maximum of the leading pulse appears at a higher frequency than that of the next pulse. Strong plasma turbulence appears to be a feasible mechanism for the creation of the implied high energy densities of ∼ 1014 erg cm-3 and brightness temperatures of ∼ 1036 K
- Publication:
-
35th COSPAR Scientific Assembly
- Pub Date:
- 2004
- Bibcode:
- 2004cosp...35..905J