Search for Short‐Term Variations in theE> 50 MeV Gamma‐Ray Emission of the Crab Pulsar
| Autor: | P. V. Ramanamurthy, D. J. Thompson |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Crab Pulsar Astrophysics::High Energy Astrophysical Phenomena Detector Astrophysics::Instrumentation and Methods for Astrophysics Gamma ray Astronomy Astronomy and Astrophysics Gamma-ray astronomy Astrophysics Radio telescope Pulsar Space and Planetary Science Observatory Emissivity Astrophysics::Solar and Stellar Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 496:863-868 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/305425 |
| Popis: | We present here a search for possible short-term (~seconds to hundreds of seconds) variability of emissivity of the Crab pulsar (beyond the 33 ms pulsation) in gamma rays at E > 50 MeV and on possible correlations between giant radio pulses and high-energy gamma rays on timescales of a few to 30 pulsar rotations. We based our analysis on part of the data from the EGRET detector aboard the Compton Gamma Ray Observatory and on the data of giant radio pulses obtained by Lundgren in 1994 at 1330, 800, and 812.5 MHz by using the Green Bank radio telescope. Finding no evidence for either, we set upper limits to fluctuations of the emissivity of the Crab pulsar in gamma rays at E > 50 MeV. Lack of correlations between giant radio pulses and gamma rays restricts some of the parameters used in the models for the occurrence of giant radio pulses. |
| Databáze: | OpenAIRE |
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