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Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar.

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Title: Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar.
Authors: Aliu, E., Arlen, T., Aune, T., Beilicke, M., Benbow, W., Bouvier, A., Bradbury, S. M., Buckley, J. H., Bugaev, V., Byrum, K., Cannon, A., Cesarini, A., Christiansen, J. L., Ciupik, L., Collins-Hughes, E., Connolly, M. P., Cui, W., Dickherber, R., Duke, C., Errando, M.
Source: Science (pre-March 2025). 10/7/2011, Vol. 334 Issue 6052, p69-72. 4p.
Subjects: Gamma ray astronomy, Gamma ray bursts, Radiation sources, Neutron stars, Pulsars, Very large array telescopes, Crab Nebula
Abstract: We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 giga—electron volts (GeV) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) array of atmospheric Cherenkov telescopes. The detection cannot be explained on the basis of current pulsar models. The photon spectrum of pulsed emission between 100 mega-electron volts and 400 GeV is described by a broken power law that is statistically preferred over a power law with an exponential cutoff. It is unlikely that the observation can be explained by invoking curvature radiation as the origin of the observed gamma rays above 100 GeV. Our findings require that these gamma rays be produced more than 10 stellar radii from the neutron star. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Detection of Pulsed Gamma Rays Above 100 GeV from the Crab Pulsar.
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  Data: <searchLink fieldCode="AR" term="%22Aliu%2C+E%2E%22">Aliu, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Arlen%2C+T%2E%22">Arlen, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Aune%2C+T%2E%22">Aune, T.</searchLink><br /><searchLink fieldCode="AR" term="%22Beilicke%2C+M%2E%22">Beilicke, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Benbow%2C+W%2E%22">Benbow, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Bouvier%2C+A%2E%22">Bouvier, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Bradbury%2C+S%2E+M%2E%22">Bradbury, S. M.</searchLink><br /><searchLink fieldCode="AR" term="%22Buckley%2C+J%2E+H%2E%22">Buckley, J. H.</searchLink><br /><searchLink fieldCode="AR" term="%22Bugaev%2C+V%2E%22">Bugaev, V.</searchLink><br /><searchLink fieldCode="AR" term="%22Byrum%2C+K%2E%22">Byrum, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Cannon%2C+A%2E%22">Cannon, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Cesarini%2C+A%2E%22">Cesarini, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Christiansen%2C+J%2E+L%2E%22">Christiansen, J. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Ciupik%2C+L%2E%22">Ciupik, L.</searchLink><br /><searchLink fieldCode="AR" term="%22Collins-Hughes%2C+E%2E%22">Collins-Hughes, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Connolly%2C+M%2E+P%2E%22">Connolly, M. P.</searchLink><br /><searchLink fieldCode="AR" term="%22Cui%2C+W%2E%22">Cui, W.</searchLink><br /><searchLink fieldCode="AR" term="%22Dickherber%2C+R%2E%22">Dickherber, R.</searchLink><br /><searchLink fieldCode="AR" term="%22Duke%2C+C%2E%22">Duke, C.</searchLink><br /><searchLink fieldCode="AR" term="%22Errando%2C+M%2E%22">Errando, M.</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 10/7/2011, Vol. 334 Issue 6052, p69-72. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Gamma+ray+astronomy%22">Gamma ray astronomy</searchLink><br /><searchLink fieldCode="DE" term="%22Gamma+ray+bursts%22">Gamma ray bursts</searchLink><br /><searchLink fieldCode="DE" term="%22Radiation+sources%22">Radiation sources</searchLink><br /><searchLink fieldCode="DE" term="%22Neutron+stars%22">Neutron stars</searchLink><br /><searchLink fieldCode="DE" term="%22Pulsars%22">Pulsars</searchLink><br /><searchLink fieldCode="DE" term="%22Very+large+array+telescopes%22">Very large array telescopes</searchLink><br /><searchLink fieldCode="DE" term="%22Crab+Nebula%22">Crab Nebula</searchLink>
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  Data: We report the detection of pulsed gamma rays from the Crab pulsar at energies above 100 giga—electron volts (GeV) with the Very Energetic Radiation Imaging Telescope Array System (VERITAS) array of atmospheric Cherenkov telescopes. The detection cannot be explained on the basis of current pulsar models. The photon spectrum of pulsed emission between 100 mega-electron volts and 400 GeV is described by a broken power law that is statistically preferred over a power law with an exponential cutoff. It is unlikely that the observation can be explained by invoking curvature radiation as the origin of the observed gamma rays above 100 GeV. Our findings require that these gamma rays be produced more than 10 stellar radii from the neutron star. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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