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First 1ES1959+650 observations with the MAGIC telescope and comparison with Crab Nebula at 40  ZA

Nadia Tonello, Max-Planck-Insitut für Physik, München. First 1ES1959+650 observations with the MAGIC telescope and comparison with Crab Nebula at 40  ZA. Introduction Data analyzed Analysis method Preliminary results. What is 1ES1959+650?. Elliptical galaxy Active Galactic Nucleus

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First 1ES1959+650 observations with the MAGIC telescope and comparison with Crab Nebula at 40  ZA

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  1. Nadia Tonello, Max-Planck-Insitut für Physik, München First 1ES1959+650 observations with the MAGIC telescopeand comparison with Crab Nebula at 40 ZA Introduction Data analyzed Analysis method Preliminary results

  2. What is 1ES1959+650? Elliptical galaxy Active Galactic Nucleus z = 0.047 RA =19h59m59.8s Dec = +6508'54'' Observability from La Palma: May-October 35-54 z.a. • 1998: First  detection: Utah Seven Telescope Array • Weak source • Confirmed in 2002 by WHIPPLE and HEGRA • Most interesting aspect: orphan flare in June 2002. Candidate source for south neutrino telescopes Nadia Tonello, MPI Munich

  3. The MAGIC Telescope Largest Imaging Air Cherenkov Telescope for -ray astronomy 17 m mirror dish 3.5 field of view 576 high-QE PMTs Design optimized for: • low energy thresholdE = 30 GeV • fast repositioningtR<30 sec Canary Island La Palma 2200 m asl Nadia Tonello, MPI Munich

  4. Gamma ray Cherenkov light Image of particle shower in telescope camera Particle shower ~ 10 km ~ 1o Cherenkov light reconstruct: arrival direction, energy reject hadron background ~ 120 m Imaging Air Cherenkov Telescopes Nadia Tonello, MPI Munich

  5. gamma shower hadron shower (background) Standard Analysis Shower reconstruction and background rejectionbased on image shape analysis raw image cleaned image Hillas parameters: Length, width, distance, alpha Nadia Tonello, MPI Munich

  6. MAGIC raw data Cuts optimized on Crab Nebula and applied to 1ES1959 and Off data Nadia Tonello, MPI Munich

  7. Signal above 2000 ph. Crab Nebula: Size >2000 ph Significance: 26.4  Excess events: 529 ± 20 1ES 1959 + 650: Size >2000 ph Significance: 7.0  Excess events: 165 Nadia Tonello, MPI Munich

  8. Time analysis • Binning in about 2 h data • No substantial variation of activity Nadia Tonello, MPI Munich

  9. X-ray light curve • Activity not particularly high 5 - 7 Sept 7 -17 Oct RXTE mission day Nadia Tonello, MPI Munich

  10. Optical light curve • Quiescent state Tuorla Observatory Blazar Monitoring Program Nadia Tonello, MPI Munich

  11. Crab-1ES1959 comparison Same cuts applied to Crab and 1ES1959 for each size bin CRAB 1ES1959 Nadia Tonello, MPI Munich

  12. Crab-1ES1959 comparison Excess events/(obs. time * size bin width) Softer spectrum? HEGRA System Results (2000-2001): 94 h obs. Time. Energy threshold: 2TeV Significance 5.4 = 3.3 ±0.7 8% Crab flux 43% 12% 9% 14% Nadia Tonello, MPI Munich

  13. Conclusions • 1ES1959 has been observed with MAGIC for ~7 h. Crab and OFF data (~ 2h each) have been selected to match ZA range: 40 deg. • Data have been analyzed with cuts optimized on Crab. • We have a signal from 1ES1959+650 when there was no high activity in X-rays • No variation of state, observations are fragmented in time. • Comparison with Crab in size bins: 1ES1959 ~40% to ~10% of Crab, compatible with HEGRA System flux measurements at high energies. • Work in progress: Energy spectrum. Nadia Tonello, MPI Munich

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