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, Benito Munar i Adrover, Pere Moldón Vara, Francisco Javier Paredes i Poy, Josep Maria Ribó Gomis, Marc Zabalza de Torres, Víctor |
Keywords: | Estels Raigs gamma Stars Gamma 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 |
URI: | http://hdl.handle.net/2445/122844 |
Related resource: | https://doi.org/10.1088/0004-637X/742/1/43 |
ISSN: | 0004-637X |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) |
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602762.pdf | 1.33 MB | Adobe PDF | View/Open |
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