Journal Article10.1086/320050
Search for Redshifted Annihilation Radiation from the Crab Pulsar
Melville P. Ulmer,S. M. Matz,J. E. Grove,M. S. Strickman,James D. Kurfess,Malvin Ruderman,Tianhua Zhu,Cheng Ho +7 more
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TL;DR: In this paper, the authors presented stringent upper limits to a redshifted e± annihilation radiation line from the Crab pulsar, based on OSSE observations that were optimized for the 400-500 keV range.
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Abstract: We present new stringent upper limits to a redshifted e± annihilation radiation line from the Crab pulsar. These upper limits are based on OSSE observations that were optimized for the 400-500 keV range. We have searched for the emission over several different phase intervals of the pulsar light curve. We find no evidence for the redshifted emission at 440 keV reported by the FIGARO team. The typical 3 σ upper limit to phase-averaged flux (i.e., the net flux from the pulsar averaged over the entire light curve) is about 2 × 10-5 photons cm-2 s-1. This value is about a factor of 4 lower than the 3 σ flux reported by the FIGARO team. This result places significant new constraints on some models in which positrons are flowing down toward the surface of the Crab pulsar.
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Citations
An upper bound on the energy of a gravitationally redshifted electron-positron annihilation line from the Crab pulsar
TL;DR: In this article, a causally consistent and pulsationally stable two component neutron star model is presented, where the core of the model is characterized by the stiffest equation of state (EOS), dP/dE = 1 (in geometrized units) and the envelope is defined by the well-known EOS of a classical polytrope d ln P/dl nρ =Γ 1((4/3) ≤ Γ 1 ≤ 2).
Formation of the 255-keV annihilation line near the magnetic poles of pulsars
V. M. Kontorovich,A. B. Flanchik +1 more
TL;DR: In this article, the possibility of existance for pulsars emitting soft γ radiation near their magnetic poles upon the annihilation of ultrarelativistic positrons from the magnetosphere and electrons from the surface of a star was discussed.
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References
The Oriented Scintillation Spectrometer Experiment - Instrument description
W. N. Johnson,R. L. Kinzer,James D. Kurfess,M. S. Strickman,W. R. Purcell,D. A. Grabelsky,Melville P. Ulmer,D. A. Hillis,G. V. Jung,R. A. Cameron +9 more
TL;DR: The Oriented Scintillation Spectrometer Experiment on the Arthur Holly Compton Gamma Ray Observatory satellite uses four actively shielded NaI (Tl)-CsI(Na) phoswich detectors to provide gamma-ray line and continuum detection capability in the 005-10 MeV energy range as discussed by the authors.
OSSE observations of the Crab pulsar
Melville P. Ulmer,S. M. Matz,R. A. Cameron,D. A. Grabelsky,J. E. Grove,W. N. Johnson,G. V. Jung,R. L. Kinzer,James D. Kurfess,Mark D. Leising +9 more
- 01 Feb 1992
TL;DR: In this article, preliminary results of the Compton Gamma Ray Observatory Oriented Scintillation Spectrometer Experiment (OSSE) observations of the Crab pulsar were presented, validating the OSSE pulsar data acquisition modes and data analysis algorithms.
EGRET Gamma-Ray Observations of the Crab P2/P1 Ratio
TL;DR: This paper showed that the high-energy gamma-ray light curve has changed little over the lifetime of the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory.
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EGRET Gamma-Ray Observations of the Crab P2/P1 Ratio
TL;DR: In this paper, the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (COS-B) showed that the high-energy gamma-ray light curve has changed little over the lifetime of the instrument.
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