scholarly journals The annular gap model for γ-ray emission from young and millisecond pulsars

2010 ◽  
Vol 406 (4) ◽  
pp. 2671-2677 ◽  
Author(s):  
Y. J. Du ◽  
G. J. Qiao ◽  
J. L. Han ◽  
K. J. Lee ◽  
R. X. Xu
Keyword(s):  
Gap Model ◽  
Millisecond Pulsars ◽  
Annular Gap ◽  
Γ Ray

scholarly journals Annular gap model for multi-wavelength pulsed emission from young and millisecond pulsars

2012 ◽  
Vol 8 (S291) ◽  
pp. 378-380
Author(s):  
Yuan Jie Du ◽  
Guo Jun Qiao
Keyword(s):  
Inclination Angle ◽  
Pole Model ◽  
Viewing Angle ◽  
Gap Model ◽  
Magnetic Pole ◽  
Millisecond Pulsars ◽  
Annular Gap ◽  
Magnetic Inclination ◽  
Multi Wavelength

AbstractThe multi-wavelength pulsed emission from young pulsars and millisecond pulsars can be well modeled with the single-pole 3-dimension annular gap and core gap model. To distinguish our single magnetic pole model from two-pole models (e.g. outer gap model and two-pole caustic model), the convincing values of the magnetic inclination angle and the viewing angle will play a key role.

scholarly journals The Galactic population and properties of young, highly energetic pulsars

2020 ◽  
Vol 497 (2) ◽  
pp. 1957-1965
Author(s):  
Simon Johnston ◽  
D A Smith ◽  
A Karastergiou ◽  
M Kramer
Keyword(s):  
Radio Emission ◽  
Birth Rate ◽  
Selection Effect ◽  
Gap Model ◽  
Radio Pulsars ◽  
Galactic Population ◽  
Small Set ◽  
Γ Rays ◽  
Γ Ray ◽  
Partial Overlap

ABSTRACT The population of young, non-recycled pulsars with spin-down energies $\dot{E} \gt 10^{35}$ erg s−1 is sampled predominantly at γ-ray and radio wavelengths. A total of 137 such pulsars are known, with partial overlap between the sources detectable in radio and γ-rays. We use a very small set of assumptions in an attempt to test whether the observed pulsar sample can be explained by a single underlying population of neutron stars. For radio emission we assume a canonical conal beam with a fixed emission height of 300 km across all spin periods and a luminosity law which depends on $\dot{E}^{0.25}$. For γ-ray emission we assume the outer-gap model and a luminosity law which depends on $\dot{E}^{0.5}$. We synthesize a population of fast-spinning pulsars with a birth rate of one per 100 yr. We find that this simple model can reproduce most characteristics of the observed population with two caveats. The first is a deficit of γ-ray pulsars at the highest $\dot{E}$ which we surmise to be an observational selection effect due to the difficulties of finding γ-ray pulsars in the presence of glitches without prior knowledge from radio frequencies. The second is a deficit of radio pulsars with interpulse emission, which may be related to radio emission physics. We discuss the implications of these findings.

scholarly journals A multiwavelength investigation of candidate millisecond pulsars in unassociated γ-ray sources

2017 ◽  
Vol 470 (1) ◽  
pp. 466-480 ◽  
Author(s):  
D. Salvetti ◽  
R. P. Mignani ◽  
A. De Luca ◽  
M. Marelli ◽  
C. Pallanca ◽  
...  
Keyword(s):  
Millisecond Pulsars ◽  
Γ Ray

scholarly journals An Annular Gap Acceleration Model for γ-ray Emission of Pulsars

2007 ◽  
Vol 7 (4) ◽  
pp. 496-502 ◽  
Author(s):  
Guo-Jun Qiao ◽  
Ke-Jia Lee ◽  
Bing Zhang ◽  
Hong-Guang Wang ◽  
Ren-Xin Xu
Keyword(s):  
Annular Gap ◽  
Acceleration Model ◽  
Γ Ray

scholarly journals Modeling the pulse profiles of millisecond pulsars in the second LAT catalog of γ-ray pulsars

2012 ◽  
Author(s):  
T. J. Johnson ◽  
A. K. Harding ◽  
C. Venter ◽  
J. E. Grove ◽  
Fermi LAT Collaboration ◽  
...  
Keyword(s):  
Millisecond Pulsars ◽  
Γ Ray

scholarly journals Searching for Gamma-Ray Millisecond Pulsars: Selection of Candidates Revisited

Galaxies ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 31
Author(s):  
Xuejie Dai ◽  
Zhongxiang Wang ◽  
Jithesh Vadakkumthani
Keyword(s):  
Point Source ◽  
Gamma Ray ◽  
Previous Analysis ◽  
Test Statistic ◽  
Large Area ◽  
Millisecond Pulsars ◽  
Multi Wavelength ◽  
Γ Ray ◽  
Available Information ◽  
Selection Of

We are starting a project to find γ -ray millisecond pulsars (MSPs) among the unidentified sources detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope (Fermi), by radio observations. The selection of good candidates from analysis of the LAT data is an important part of the project. Given that there is more than 10 years worth of LAT data and the advent of the newly released LAT 8-year point source list (FL8Y), we have conducted a selection analysis, on the basis of our previous analysis, and report the results here. Setting the requirements for the unidentified sources in FL8Y of Galactic latitudes | b | > 5 ∘ and curvature significances >3 σ , there are 202 sources with detection signficances >6 σ . We select 57 relatively bright ones (detection significances >15 σ ) and analyze their 10.2 years of LAT data. Their variability is checked to exclude variable sources (likely blazars), test statistic maps are constructed to avoid contaminated sources, and curvature significances are re-obtained and compared to their γ -ray spectra to exclude non-significant sources. In the end, 48 candidates are found. Based on the available information, mostly from multi-wavelength studies, we discuss the possible nature of several of the candidates. Most of these candidates are currently being observed with the 65-meter Shanghai Tian Ma Radio Telescope.

scholarly journals RADIO-TO-TeV PHASE-RESOLVED EMISSION FROM THE CRAB PULSAR: THE ANNULAR GAP MODEL

2012 ◽  
Vol 748 (2) ◽  
pp. 84 ◽  
Author(s):  
Y. J. Du ◽  
G. J. Qiao ◽  
W. Wang
Keyword(s):  
Crab Pulsar ◽  
Gap Model ◽  
Annular Gap
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