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Observations of Giant Pulses from Pulsar PSR B0950+08 using LWA1 | | Jr-Wei Tsai
; John H. Simonetti
; Bernadine Akukwe
; Brandon Bear
; Sean E. Cutchin
; Jayce Dowell
; Jonathan D. Gough
; Jonah Kanner
; Namir E. Kassim
; Frank K. Schinzel
; Peter Shawhan
; Gregory B. Taylor
; Cregg C. Yancey
; Leandro Quezada
; Michael Kavic
; | | Date: |
4 Feb 2015 | | Abstract: | We report the detection of giant pulse emission from PSR B0950+08 in 24 hours
of observations made at 39.4 MHz, with a bandwidth of 16 MHz, using the first
station of the Long Wavelength Array, LWA1. We detected 119 giant pulses from
PSR B0950+08 (at its dispersion measure), which we define as having SNRs at
least 10 times larger than for the mean pulse in our data set. These 119 pulses
are 0.035\% of the total number of pulse periods in the 24 hours of
observations. The rate of giant pulses is about 5.0 per hour. The cumulative
distribution of pulse strength $S$ is a steep power law, $N(>S)propto
S^{-4.7}$, but much less steep than would be expected if we were observing the
tail of a Gaussian distribution of normal pulses. We detected no other
transient pulses in a dispersion measure range from 1 to 90 pc cm$^{-3}$, in
the beam tracking PSR B0950+08. The giant pulses have a narrower temporal width
than the mean pulse (17.8 ms, on average, vs. 30.5 ms). The pulse widths are
consistent with a previously observed weak dependence on observing frequency,
which may be indicative of a deviation from a Kolmogorov spectrum of electron
density irregularities along the line of sight. The rate and strength of these
giant pulses is less than has been observed at $sim$100 MHz. Additionally, the
mean (normal) pulse flux density we observed is less than at $sim$100 MHz.
These results suggest this pulsar is weaker and produces less frequent giant
pulses at 39 MHz than at 100 MHz. | | Source: | arXiv, 1502.1282 | | Services: | Forum | Review | PDF | Favorites | |
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