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The Cluster Analysis of Pulsar Parameters

Published online by Cambridge University Press:  12 April 2016

Igor’ F. Malov  and
Oleg I. Malov
Igor’ F. Malov
Affiliation:
Astro Space Center, Lebedev Physics Institute, Moscow, Russia
Oleg I. Malov
Affiliation:
Astro Space Center, Lebedev Physics Institute, Moscow, Russia

Extract

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We have used the catalogue of (Taylor et al., 1993) to investigate the problem of a classification of pulsars. Five samples have been analysed by the main components method and by methods of the cluster analysis.

  1. i) 15 pulsars with 14 known parameters P, Ṗ, W50, L (Malov et al., 1994), B, z,spectral index a, frequencies of maximum VM and minimum Vc in a spectrum (Malofeev et al., 1994), an angle between magnetic moment and rotation axis β (Malov, 1994), the transformation coefficient η = L/Ė, magnetic field near the light cylinder Blc and a maximum derivative of a position angle C = (dψ/dφ)max (Malov, 1990).

  2. ii) 130 objects with 10 parameters (the spectral characteristics α, VM, VC and the parameter C were excluded from the consideration).

  3. iii) 218 pulsars with 4 known parameters P, Ṗ, L and z. These parameters can be considered as independent variables.

  4. iv) 89 sources with the same 4 parameters. This sample consists of two subsamples: 65 pulsars with P > 1 s and 24 ones with P < 0.1 s.

  5. v) 24 pulsars with P < 0.1 s from the previous sample.

Type
Part 1 The Pulsar Population
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 57 - 58
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Malov, I.F., Malofeev, V.M., and Sen’yo, D.S. 1994, Astron. Zh., 71, 762 Google Scholar
Malofeev, V.M. et al. 1994, Astron. Astrophys., 285, 201 Google Scholar
Malov, I.F. 1990, Astron. Zh., 67, 377 Google Scholar
Malov, I.F., Suleymanova, S.A. 1982, Astrofizika, 18, 107 Google Scholar
Taylor, J.H., Manchester, R.N., and Lyne, A.G. 1993, Astrophys. J. Suppl Ser., 88, 529 Google Scholar