DIFFERENCES BETWEEN RADIO-LOUD AND RADIO-QUIET γ -RAY PULSARS AS REVEALED BY FERMI

Journal Article · Tue Jan 10 04:00:00 EST 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/834/2/120· OSTI ID:22663980

Hui, C. Y.; Lee, Jongsu ^[1]; Takata, J. ^[2]; Ng, C. W.

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1. Department of Astronomy and Space Science, Chungnam National University, Daejeon (Korea, Republic of)
2. Institute of Particle physics and Astronomy, Huazhong University of Science and Technology (China)

By comparing the properties of non-recycled radio-loud γ -ray pulsars and radio-quiet γ -ray pulsars, we have searched for the differences between these two populations. We found that the γ -ray spectral curvature of radio-quiet pulsars can be larger than that of radio-loud pulsars. Based on the full sample of non-recycled γ -ray pulsars, their distributions of the magnetic field strength at the light cylinder are also found to be different. We note that this might result from an observational bias. By reexamining the previously reported difference of γ -ray-to-X-ray flux ratios, we found that the significance can be hampered by their statistical uncertainties. In the context of the outer gap model, we discuss the expected properties of these two populations and compare with the possible differences that are identified in our analysis.

• OSTI ID: 22663980
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 834; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COMPARATIVE EVALUATIONS
COSMIC GAMMA SOURCES
COSMIC RADIO SOURCES
DISTRIBUTION
GAMMA RADIATION
MAGNETIC FIELDS
PULSARS
STARS
VISIBLE RADIATION
X RADIATION