2009A&A...506..865S


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET18:14:18

2009A&A...506..865S - Astronomy and Astrophysics, volume 506, 865-874 (2009/11-1)

S2DFS: analysis of temporal changes of drifting subpulses.

SERYLAK M., STAPPERS B.W. and WELTEVREDE P.

Abstract (from CDS):

We introduce a new technique, called the sliding two-dimensional fluctuation spectrum, used for detecting and characterising the temporal changes of drifting subpulses from radio pulsars. The method was tested using simulated data as well as archived observations made with the Westerbork Synthesis Radio Telescope (WSRT) at wavelengths of 92 and 21cm. The drifting subpulse phenomenon is a well known property of radio pulsars. It has been studied extensively since their discovery, however the properties of the temporal behaviour of drifting subpulses are not fully explored. The drifting can also be non-coherent and the presence of effects like nulling or drift rate changing can mask the drifting behaviour of the pulsar. The S2DFS is a robust method for investigating this phenomenon and by introducing it we aim to expand our knowledge of the temporal drifting subpulse properties. Our new analysis method uses horizonally collapsed fluctuation spectra obtained with the two-dimensional fluctuation spectrum (2DFS) method. Stacking the collapsed spectra obtained in a 256 pulse window which slides by a pulse at a time produces a map of the collapsed fluctuation spectrum (S2DFS plot). By analysing the maps one can easily determine the presence of any temporal drift changes. Simulated data showed that the technique can reveal the presence of any temporal changes in drift behaviour like mode changing or nulling. We have also analysed data of three pulsars, PSRs B0031-07, B1819-22 and B1944+17, which were selected based on the quality of the data and their known drift properties. All three sources are known to exhibit mode changes which could easily be seen in the S2DFS. The results from the analysis of the data sets used in this paper have shown that the S2DFS method is robust and complimentary to the 2DFS method in detecting and characterising the temporal changes in drifting subpulses from radio pulsars.

Abstract Copyright:

Journal keyword(s): methods: analytical - pulsars: general

CDS comments: Paragraphe 1 PSR B0826+06 is a probable misprint for PSR B0834+06.

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 PSR B0031-07 Psr 00 34 08.86 -07 21 53.4           ~ 279 0
2 PSR B0809+74 Psr 08 14 59.500 +74 29 05.70           ~ 370 0
3 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2096 1
4 PSR B0834+06 Psr 08 37 05.642 +06 10 14.56           ~ 399 0
5 PSR B1133+16 Psr 11 36 03.180 +15 51 09.62           ~ 618 0
6 PSR B1237+25 Psr 12 39 40.386 +24 53 49.87           ~ 420 0
7 PSR J1502-5653 Psr 15 02 57.389 -56 53 39.21           ~ 16 0
8 PSR B1819-22 Psr 18 22 58.95 -22 56 31.0           ~ 83 0
9 PSR B1929+10 Psr 19 32 13.79 +10 59 33.2           ~ 703 0
10 PSR B1944+17 Psr 19 46 53.044 +18 05 41.24           ~ 216 0

    Equat.    Gal    SGal    Ecl

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