Detection of pulsed gamma-ays above 25 GeV from the Crab pulsar Export

@article{citeulike:3338398, abstract = {One fundamental unanswered question about pulsars concerns the mechanism of their pulsed electromagnetic radiation. Measuring the high end region of a pulsar's spectrum would shed light on this question, but has challenged ground- based experiments for three decades. By developing a new type of electronic trigger, we could lower the threshold of the MAGIC Cherenkov telescope to 25 GeV, a major breakthrough for this kind of instrument. We detected pulsed gamma-ays from the Crab above 25 GeV, revealing a relatively high energy cut-off in the phase-averaged spectrum. This indicates that emission happens far out in the magnetosphere. Also, the main-pulse and secondary pulse have similar amplitudes at 25 GeV. These results exclude the polar cap model and challenge the slot gap emission model for Crab.}, archivePrefix = {arXiv}, author = {Collaboration, Magic and Aliu, E.}, citeulike-article-id = {3338398}, citeulike-linkout-0 = {http://arxiv.org/abs/0809.2998}, citeulike-linkout-1 = {http://arxiv.org/pdf/0809.2998}, day = {17}, eprint = {0809.2998}, keywords = {crab, gammaray}, month = {Sep}, posted-at = {2008-09-26 00:41:06}, priority = {2}, title = {Detection of pulsed gamma-ays above 25 GeV from the Crab pulsar}, url = {http://arxiv.org/abs/0809.2998}, year = {2008} }

TY - JOUR ID - citeulike:3338398 L3 - citeulike-article-id:3338398 N2 - One fundamental unanswered question about pulsars concerns the mechanism of their pulsed electromagnetic radiation. Measuring the high end region of a pulsar's spectrum would shed light on this question, but has challenged ground- based experiments for three decades. By developing a new type of electronic trigger, we could lower the threshold of the MAGIC Cherenkov telescope to 25 GeV, a major breakthrough for this kind of instrument. We detected pulsed gamma-ays from the Crab above 25 GeV, revealing a relatively high energy cut-off in the phase-averaged spectrum. This indicates that emission happens far out in the magnetosphere. Also, the main-pulse and secondary pulse have similar amplitudes at 25 GeV. These results exclude the polar cap model and challenge the slot gap emission model for Crab. TI - Detection of pulsed gamma-ays above 25 GeV from the Crab pulsar KW - crab KW - gammaray AU - Collaboration, Magic AU - Aliu, E PY - 2008/Sep/17/ UR - http://arxiv.org/abs/0809.2998 ER -