Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-08-26
ApJ, 742, 43, 2011
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
14 pages, 15 figures, published in Astrophysical Journal
Scientific paper
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.
Aleksić J.
Alvarez E. A.
Angelis Alessando de
Antonelli Lucio Angelo
Antoranz P.
No associations
LandOfFree
Observations of the Crab pulsar between 25 GeV and 100 GeV with the MAGIC I telescope does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Observations of the Crab pulsar between 25 GeV and 100 GeV with the MAGIC I telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of the Crab pulsar between 25 GeV and 100 GeV with the MAGIC I telescope will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-613630