Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...547..949o&link_type=abstract
The Astrophysical Journal, Volume 547, Issue 2, pp. 949-958.
Astronomy and Astrophysics
Astronomy
33
Gamma Rays: Observations, Ism: Individual: Name: Crab Nebula, Ism: Supernova Remnants, Stars: Pulsars: Individual: Name: Crab Pulsar
Scientific paper
The Solar Tower Atmospheric Cerenkov Effect Experiment (STACEE) is a new ground-based atmospheric Cerenkov telescope for gamma-ray astronomy. STACEE uses the large mirror area of a solar heliostat facility to achieve a low energy threshold. A prototype experiment that uses 32 heliostat mirrors with a total mirror area of ~1200 m2 has been constructed. This prototype, called STACEE-32, was used to search for high-energy gamma-ray emission from the Crab Nebula and Pulsar. Observations taken between 1998 November and 1999 February yield a strong statistical excess of gamma-like events from the Crab, with a significance of +6.75 σ in 43 hr of on-source observing time. No evidence for pulsed emission from the Crab Pulsar was found, and the upper limit on the pulsed fraction of the observed excess was less than 5.5% at the 90% confidence level. A subset of the data was used to determine the integral flux of gamma rays from the Crab. We report an energy threshold of Eth=190+/-60 GeV, and a measured integral flux of I(E>Eth)=(2.2+/-0.6+/-0.2)×10-10 photons cm-2 s-1. The observed flux is in agreement with a continuation to lower energies of the power-law spectrum seen at TeV energies.
Bhattacharya Dipen
Boone Lowell M.
Chantell Mark Charles
Conner Z.
Covault Corbin E.
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