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Positron-cyclotron maser for the core emissions from pulsars
Ma, CY; Mao, DY; Wang, DY; Wu, XJ
AbstractWe use the cyclotron-maser theory to explain the core emission from the: magnetosphere of pulsars. As a kind of direct and efficient maser type of emission, it can give rise to escaping radiation with extremely high brightness temperature and narrow angle with respect to the magnetic axis. We find that the growth rates and real frequencies of the O-mode electromagnetic wave propagating parallel to the magnetic fields depend on the ratio of the plasma frequency omega(p) and the gyrofrequency omega(b) rather than the plasma frequency alone, as described by other models. The emission takes place in the region where the magnitude of omega(p)/omega(b) is 10(-2). The corresponding altitude is about a few decades of neutron star radius, where the magnetic field strength is about 10(6) - 10(8) G. We find that the growth rates of the: cyclotron maser instability change very sensitively with the ratio omega(p)/omega(b), which is the function of radius r from the center of the neutron star. It results in a very steep radius-to-frequency mapping of radio emissions from the magnetospheres, thus a very compact emission region. A qualitative spectrum and a lower frequency cut-off of the radio emission could be obtained by this model.
KeywordRadio-emission Radiation Mechanism
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000078395200003
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Hehai Univ, Dept Math & Phys, Nanjing 210008, Peoples R China
3.Peking Univ, Dept Geophys, Beijing 100871, Peoples R China
Recommended Citation
GB/T 7714
Ma, CY,Mao, DY,Wang, DY,et al. Positron-cyclotron maser for the core emissions from pulsars[J]. ASTROPHYSICS AND SPACE SCIENCE,1998,257(2):201-212.
APA Ma, CY,Mao, DY,Wang, DY,&Wu, XJ.(1998).Positron-cyclotron maser for the core emissions from pulsars.ASTROPHYSICS AND SPACE SCIENCE,257(2),201-212.
MLA Ma, CY,et al."Positron-cyclotron maser for the core emissions from pulsars".ASTROPHYSICS AND SPACE SCIENCE 257.2(1998):201-212.
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