Constraints on the steady and pulsed very high energy gamma-ray emission from observations of PSR B1951+32/CTB 80 with the Magic telescope
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2007
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IOP Publishing
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Abstract
We report on very high energy gamma-ray observations with the MAGIC Telescope of the pulsar PSR B1951+32 and its associated nebula, CTB 80. Our data constrain the cutoff energy of the pulsar to be less than 32 GeV, assuming the pulsed gamma-ray emission to be exponentially cut off. In the case that the cutoff follows a superexponential behavior, the cutoff energy can be as high as similar to 60 GeV. The upper limit on the flux of pulsed gamma-ray emission above 75 GeV is 4.3; 10(-11) photons cm(-2) s(-1), and the upper limit on the flux of steady emission above 140 GeV is 1.5; 10(-11) photons cm(-2) s(-1). We discuss our results in the framework of recent model predictions and other studies.
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© The American Astronomical Society. We would like to thank the IAC for the excellent working conditions on the La Palma Observatory Roque de los Muchachos. We are grateful to the RXTE ASMteamfor their quick-look results. The support of the German BMBF andMPG, the Italian INFN, and the Spanish CICYT is gratefully acknowledged. This work
was also supported by ETH research grant TH-34/04-3 and by
Polish grant MNiI 1P03D01028. In addition, the authors want
to thank Deirdre Horan, Martin Tluczykont, and Frédéric Piron for providing Mrk 501 data from WHIPPLE, HEGRA CT1,
and HEGRA CT System and CAT, respectively, and for useful
discussions.