A Search for Ultra--High-Energy Gamma-Ray Emission from the Crab Nebula and Pulsar

Details A Search for Ultra--High-Energy Gamma-Ray Emission from the Crab Nebula and Pulsar A Search for Ultra--High-Energy Gamma-Ray Emission from the Crab Nebula and Pulsar

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...481..313b&link_type=abstract

Astrophysical Journal v.481, p.313

Astronomy and Astrophysics

Astronomy

14

Gamma Rays: Observations, Ism: Individual Name: Crab Nebula, Stars: Pulsars: Individual Name: Crab Nebula

Scientific paper

We have examined 2.4 x 109 events recorded by the Chicago Air Shower Array--Michigan Muon Array (CASA-MIA) experiment for evidence of ultra--high-energy (>~100 TeV) neutral particle and gamma-ray emissions from the Crab Nebula and Pulsar between 1990 March 4 and 1995 October 9. No such emissions have been detected. Over this interval, the 90% confidence level integral flux limits for continuous emission above 141 TeV are 2.08 x 10-14 cm-2 s-1 for any neutral particle (which can produce a detectable air shower) and 9.21 x 10-15 cm-2 s-1 for gamma rays. There is no evidence of transient emission on timescales of 1 day or longer. The 90% confidence level integral flux limit for emission on a single day is conservatively estimated to be 4.40 x 10-12 cm-2 s-1 for any neutral particle and 5.09 x 10-12 cm-2 s-1 for gamma rays. There is no evidence for emission from the pulsar at the radio period on intervals of 1 day or longer. The 2 sigma (97.7% confidence) limit on the pulsed flux on the most significant day is 3.29 x 10-12 cm-2 s-1 for any neutral particle with mass less than 21 MeV, and 8.31 x 10-12 cm-2 s-1 for gamma rays. For an interval of 162 sidereal days beginning 1992 March 1, the pulsed flux limit was 2.39 x 10-13 cm-2 s-1 for any neutral particle with mass less than 21 MeV, again above 141 TeV.

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