skip to main content

SciTech ConnectSciTech Connect

Title: Observations of giant pulses from pulsar B0950+08 using LWA1

We report the detection of giant pulse (GP) 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. We detected 119 GPs from PSR B0950+08 (at its dispersion measure (DM)), which we define as having a signal-to-noise ratio 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 GPs is about 5.0 per hour. The cumulative distribution of pulse strength S is a steep power law, N(>S)∝S{sup −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 DM range from 1 to 90 pc cm{sup −3}, in the beam tracking PSR B0950+08. The GPs have a narrower temporal width than the mean pulse (17.8 ms, on average, versus 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 electronmore » density irregularities along the line of sight. The rate and strength of these GPs is less than has been observed at ∼100 MHz. Additionally, the mean (normal) pulse flux density we observed is less than at ∼100 MHz. These results suggest this pulsar is weaker and produces less frequent GPs at 39 MHz than at 100 MHz.« less
Authors:
; ;  [1] ; ; ;  [2] ;  [3] ; ; ;  [4] ;  [5] ;  [6] ;  [7] ; ;  [8]
  1. Department of Physics, Virginia Tech, Blacksburg, VA 24061 (United States)
  2. Department of Physics, Long Island University, Brooklyn, NY 11201 (United States)
  3. NRC-NRL Postdoctoral Fellow, Washington, DC 20375 (United States)
  4. Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM 87131 (United States)
  5. Department of Chemistry and Biochemistry, Long Island University, Brooklyn, NY 11201 (United States)
  6. LIGO-California Institute of Technology, Pasadena, CA 91125 (United States)
  7. Naval Research Laboratory, Washington, DC 20375 (United States)
  8. Department of Physics, University of Maryland, College Park, MD 20742 (United States)
Publication Date:
OSTI Identifier:
22342122
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 149; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DETECTION; DISPERSIONS; DISTRIBUTION; ELECTRON DENSITY; EMISSION; FLUX DENSITY; GAUSS FUNCTION; MHZ RANGE; PULSARS; PULSES; SCATTERING; SIGNAL-TO-NOISE RATIO; SPECTRA; TRANSIENTS; WAVELENGTHS