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Title: GIANT-PULSE EMISSION FROM PSR B0950+08

Abstract

We present here the detection of giant-pulse emission from PSR B0950+08, a normal-period pulsar. The observations, made at 103 MHz and lasting for about 10 months, have shown on a number of days the frequency of occurrence of giant pulses to be the highest among known pulsars. The flux-density level of successive giant pulses fluctuates rapidly and their occurrence rates within a day's observations as well as between neighboring days show large variations. While on some days PSR B0950+08 shows a large number of giant pulses, there are other days when it shows only 'quasi-nulls' with no detectable emission in the power spectrum or in the folded pulse data. The cumulative intensity distribution of these giant pulses appears to follow a power law, with index -2.2. After eliminating instrumental, ionospheric, interplanetary, and interstellar diffractive and refractive scintillation effects as the cause, it appears that these intensity variations are intrinsic to the pulsar. We suggest that the giant-pulse emission and nulling may be opposite manifestations of the same physical process, in the former case an enhanced number of charges partaking in the coherent radiation process giving rise to an extremely high intensity while in the latter case the coherence could bemore » minimal.« less

Authors:
;  [1]
  1. Astronomy and Astrophysics Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380009 (India)
Publication Date:
OSTI Identifier:
22089816
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 144; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; COHERENT RADIATION; EMISSION; EMISSION SPECTRA; EMISSION SPECTROSCOPY; FLUX DENSITY; INDEXES; MHZ RANGE; PHOTON EMISSION; PULSARS; PULSES; STARS; VARIATIONS

Citation Formats

Singal, Ashok K., and Vats, Hari Om, E-mail: asingal@prl.res.in. GIANT-PULSE EMISSION FROM PSR B0950+08. United States: N. p., 2012. Web. doi:10.1088/0004-6256/144/5/155.
Singal, Ashok K., & Vats, Hari Om, E-mail: asingal@prl.res.in. GIANT-PULSE EMISSION FROM PSR B0950+08. United States. doi:10.1088/0004-6256/144/5/155.
Singal, Ashok K., and Vats, Hari Om, E-mail: asingal@prl.res.in. Thu . "GIANT-PULSE EMISSION FROM PSR B0950+08". United States. doi:10.1088/0004-6256/144/5/155.
@article{osti_22089816,
title = {GIANT-PULSE EMISSION FROM PSR B0950+08},
author = {Singal, Ashok K. and Vats, Hari Om, E-mail: asingal@prl.res.in},
abstractNote = {We present here the detection of giant-pulse emission from PSR B0950+08, a normal-period pulsar. The observations, made at 103 MHz and lasting for about 10 months, have shown on a number of days the frequency of occurrence of giant pulses to be the highest among known pulsars. The flux-density level of successive giant pulses fluctuates rapidly and their occurrence rates within a day's observations as well as between neighboring days show large variations. While on some days PSR B0950+08 shows a large number of giant pulses, there are other days when it shows only 'quasi-nulls' with no detectable emission in the power spectrum or in the folded pulse data. The cumulative intensity distribution of these giant pulses appears to follow a power law, with index -2.2. After eliminating instrumental, ionospheric, interplanetary, and interstellar diffractive and refractive scintillation effects as the cause, it appears that these intensity variations are intrinsic to the pulsar. We suggest that the giant-pulse emission and nulling may be opposite manifestations of the same physical process, in the former case an enhanced number of charges partaking in the coherent radiation process giving rise to an extremely high intensity while in the latter case the coherence could be minimal.},
doi = {10.1088/0004-6256/144/5/155},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 5,
volume = 144,
place = {United States},
year = {2012},
month = {11}
}