J/A+A/469/607 Pulsar subpulse modulation properties at 92cm (Weltevrede+, 2007)
The subpulse modulation properties of pulsars at 92 cm and the frequency
dependence of subpulse modulation.
Weltevrede P., Stappers B.W., Edwards R.T.
<Astron. Astrophys. 469, 607 (2007)>
=2007A&A...469..607W 2007A&A...469..607W
ADC_Keywords: Pulsars ; Radio sources
Keywords: stars: pulsars: general - radiation mechanisms: non-thermal
Abstract:
A large sample of pulsars has been observed to study their subpulse
modulation at an observing wavelength (when achievable) of both 21 and
92 cm using the Westerbork Synthesis Radio Telescope. In this paper we
present the 92-cm data and a comparison is made with the already
published 21-cm results.
The main goals are to determine what fraction of the pulsars have
drifting subpulses, whether those pulsars share some physical
properties and to find out if subpulse modulation properties are
frequency dependent.
We analysed 191 pulsars at 92-cm searching for subpulse modulation
using fluctuation spectra. The sample of pulsars is as unbiased as
possible towards any particular pulsar characteristics.
Description:
This table contains the subpulse modulation properties (at an
observing wavelength of 92cm) of the radio pulsars in the survey
conducted using the Westerbork Synthesis Radio Telescope. One can find
in this table properties like the measured modulation index and the
horizontal and vertical driftband separation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 130 191 The subpulse modulation properties of the pulsars
in the survey (at an observing wavelength of 92cm)
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See also:
J/A+A/445/243 : Pulsar subpulse modulation prop. at 21cm (Weltevrede+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- PSR Name of pulsar
12- 15 A4 --- Class The classification we made (1)
17- 22 F6.4 s P0 Pulse period
24- 31 E8.1 --- dP/dt Spin down parameter
33- 38 I6 --- Pulses Number of pulses in observation
40- 44 I5 --- SNR Signal to noise ratio
46- 50 F5.3 --- m ? Modulation index
52- 56 F5.3 --- e_m ? Uncertainty on the m
58- 61 F4.2 --- mThr Threshold value for detection m
62- 67 F6.1 deg P2 ? Centroid P2 value
68 A1 --- u_P2 [?] Uncertainy flag on P2
69- 74 F6.1 deg E_P2 ? Positive uncertainty on P2
76- 81 F6.1 deg e_P2 ? Negative uncertainty on P2
83- 89 F7.3 --- P3 ? Centroid P3 value, in units of P0
91- 96 F6.3 --- e_P3 ? Uncertainy on P3, in units of P0
98-103 F6.1 deg P2.2 ? Centroid P2 value (2)
104 A1 --- u_P2.2 [?] Uncertainy flag on P2.2
105-110 F6.1 deg E_P2.2 ? Positive uncertainty on P2.2 (2)
112-117 F6.1 deg e_P2.2 ? Negative uncertainty on P2.2 (2)
118-123 F6.3 --- P3.2 ? Centroid P3 value, in units of P0 (2)
125-130 F6.3 --- e_P3.2 ? Uncertainy on P3.2, in units of P0 (2)
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Note (1): Classification as follows:
Coh = coherent drifter
Dif = diffuse drifters with drift features which are clearly
separated from the alias borders
Dif* = diffuse drifters without drift features which are clearly
separated from the alias borders
Lon = pulsars showing longitude stationary subpulse modulation
Note (2): These values are for the second component of the pulse profile,
see the paper for details.
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Acknowledgements:
Patrick Weltevrede, wltvrede(at)science.uva.nl
(End) P. Weltvrede [API, The Netherlands], P. Vannier [CDS] 27-Apr-2007