The statistics of radio pulsars: A spark model

被引:18
作者
Fan, GL [1 ]
Cheng, KS
Manchester, RN
机构
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
关键词
pulsars : general; stars : neutron; stars : statistics;
D O I
10.1086/321646
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We use Monte Carlo techniques to relate a theoretical pulsar emission model to the observed distributions of pulse period, magnetic field strength, distance, and luminosity of radio pulsars. We assume that the radio luminosity of pulsars is proportional to the gap potential and current flow from the polar cap. The current is assumed to be nonuniform and clustered in sparks, but only those sparks swept by the line of sight contribute to the observed radio luminosity. We test our model by using the Ruderman-Sutherland vacuum gap potential and find that the simulated distributions are consistent with those observed, with the exception of the period distribution. The model predicts more long-period pulsars than are observed. This discrepancy may result from the model itself, a reduced sensitivity of surveys to long-period pulsars, or the nondipole spin-down of pulsars.
引用
收藏
页码:297 / 303
页数:7
相关论文
共 51 条
[1]   Pulsar radio luminosity laws revisited [J].
Allen, MP ;
Horvath, JE .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 317 (01) :23-27
[2]  
ARENDT PN, 2000, IAU C, V177, P445
[3]  
ARONS J, 1979, ASTROPHYS J, V231, P854, DOI 10.1086/157250
[4]   Magnetic photon splitting: Computations of proper-time rates and spectra [J].
Baring, MG ;
Harding, AK .
ASTROPHYSICAL JOURNAL, 1997, 482 (01) :372-376
[5]  
BHATTACHARYA D, 1992, ASTRON ASTROPHYS, V254, P198
[6]  
BIGGS JD, 1990, MON NOT R ASTRON SOC, V245, P514
[7]   THE GALACTIC DISTRIBUTION OF FREE-ELECTRONS [J].
CORDES, JM ;
WEISBERG, JM ;
FRAIL, DA ;
SPANGLER, SR ;
RYAN, M .
NATURE, 1991, 354 (6349) :121-124
[8]   Pulsar magnetospheric emission mapping: Images find implications of polar cap weather [J].
Deshpande, AA ;
Rankin, JM .
ASTROPHYSICAL JOURNAL, 1999, 524 (02) :1008-1013
[9]   A SEARCH FOR LOW-LUMINOSITY PULSARS [J].
DEWEY, RJ ;
TAYLOR, JH ;
WEISBERG, JM ;
STOKES, GH .
ASTROPHYSICAL JOURNAL, 1985, 294 (01) :L25-L29
[10]   THE INTRINSIC LUMINOSITY AND INITIAL PERIOD OF PULSARS [J].
EMMERING, RT ;
CHEVALIER, RA .
ASTROPHYSICAL JOURNAL, 1989, 345 (02) :931-938