Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/122844
 Title: Observations of the Crab Pulsar between 25 and 100 GeV with the MAGIC I Telescope Author: Cañellas, A.Marcote Martin, BenitoMunar i Adrover, PereMoldón Vara, Francisco JavierParedes i Poy, Josep MariaRibó Gomis, MarcZabalza de Torres, Víctor Keywords: EstelsRaigs gammaStarsGamma rays Issue Date: 20-Nov-2011 Publisher: Institute of Physics (IOP) Abstract: We report on the observation of $\gamma$-rays above 25\,GeV from the Crab pulsar (PSR B0532+21) using the MAGIC I telescope. Two data sets from observations during the winter period 2007/2008 and 2008/2009 are used. In order to discuss the spectral shape from 100\,MeV to 100\,GeV, one year of public {\it Fermi} Large Area Telescope ({\it Fermi}-LAT) data are also analyzed to complement the MAGIC data. The extrapolation of the exponential cutoff spectrum determined with the Fermi-LAT data is inconsistent with MAGIC measurements, which requires a modification of the standard pulsar emission models. In the energy region between 25 and 100\,GeV, the emission in the P1 phase (from -0.06 to 0.04, location of the main pulse) and the P2 phase (from 0.32 to 0.43, location of the interpulse) can be described by power laws with spectral indices of $-3.1 \pm 1.0_{stat} \pm 0.3_{syst}$ and $-3.5 \pm 0.5_{stat} \pm 0.3_{syst}$, respectively. Assuming an asymmetric Lorentzian for the pulse shape, the peak positions of the main pulse and the interpulse are estimated to be at phases $-0.009 \pm 0.007$ and $0.393 \pm 0.009$, while the full widths at half maximum are $0.025 \pm 0.008$ and $0.053 \pm 0.015$, respectively. Note: Reproducció del document publicat a: https://doi.org/10.1088/0004-637X/742/1/43 It is part of: Astrophysical Journal, 2011, vol. 742, num. 43 Related resource: https://doi.org/10.1088/0004-637X/742/1/43 URI: http://hdl.handle.net/2445/122844 ISSN: 0004-637X Appears in Collections: Articles publicats en revistes (Física Quàntica i Astrofísica)Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

Files in This Item:
File Description SizeFormat