scholarly journals A long-term study of three rotating radio transients

2018 ◽  
Vol 477 (3) ◽  
pp. 4090-4103 ◽  
Author(s):  
B Bhattacharyya ◽  
A G Lyne ◽  
B W Stappers ◽  
P Weltevrede ◽  
E F Keane ◽  
...  
Keyword(s):  
Term Study ◽  
Long Term Study ◽  
Radio Transients ◽  
Rotating Radio Transients

scholarly journals Long-term study of extreme giant pulses from PSR B0950+08 with AARTFAAC

2020 ◽  
Vol 497 (1) ◽  
pp. 846-854
Author(s):  
Mark Kuiack ◽  
Ralph A M J Wijers ◽  
Antonia Rowlinson ◽  
Aleksandar Shulevski ◽  
Folkert Huizinga ◽  
...  
Keyword(s):  
Time Scale ◽  
Low Frequency ◽  
Transient Detection ◽  
Term Study ◽  
Long Term Study ◽  
Giant Pulses ◽  
Order Of Magnitude ◽  
Radio Transients ◽  
Detection Instrument

ABSTRACT We report on the detection of extreme giant pulses (GPs) from one of the oldest known pulsars, the highly variable PSR B0950+08, with the Amsterdam-ASTRON Radio Transient Facility And Analysis Centre (AARTFAAC), a parallel transient detection instrument operating as a subsystem of the LOw Frequency ARray (LOFAR). During processing of our Northern Hemisphere survey for low-frequency radio transients, a sample of 275 pulses with fluences ranging from 42 to 177 kJy ms were detected in one-second snapshot images. The brightest pulses are an order of magnitude brighter than those previously reported at 42 and 74 MHz, on par with the levels observed in a previous long-term study at 103 MHz. Both their rate and fluence distribution differ between and within the various studies done to date. The GP rate is highly variable, from 0 to 30 per hour, with only two 3-h observations accounting for nearly half of the pulses detected in the 96 h surveyed. It does not vary significantly within a few-hour observation, but can vary strongly one from day to the next. The spectra appear strongly and variably structured, with emission sometimes confined to a single 195.3 kHz subband, and the pulse spectra changing on a time-scale of order 10 min.

Quinapril for Sclerosis Failed in Long-Term Study

2007 ◽  
Vol 38 (6) ◽  
pp. 14
Author(s):  
DAMIAN MCNAMARA
Keyword(s):  
Term Study ◽  
Long Term Study
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